Additive Manufactoring - Contributi utente [it]

Laser engineered net shaping

2020-01-08T17:36:23Z

GiacomoTarabella: Creata pagina con "*Cutting forces analysis in additive manufactured AISI H13 alloy"

*[[Cutting forces analysis in additive manufactured AISI H13 alloy]]

Main Page

2020-01-08T17:36:06Z

GiacomoTarabella: /* Processes */

[https://docs.google.com/document/d/1Dpv8YCcSNuxh99Nw9ARPFtaRnw1ZEKm8RlWba0UMcWU/edit Istruzioni (in Italian, sorry)]

=[[Materials]]=

[[Additive Manufacturing Approaches for Hydroxyapatite‐Reinforced Composites]]

[[Precision additive manufacturing of NiTi parts using micro direct metal deposition]]

=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Laser Machining]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]
*[[Laser engineered net shaping]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[Development of a multifunctional panel for aerospace use through SLM additive manufacturing]]
*[[3D printing for health & wealth: Fabrication of custom-made medical devices through additive manufacturing.]]

Cutting forces analysis in additive manufactured AISI H13 alloy

2020-01-08T17:34:36Z

GiacomoTarabella:

'''Authors and full affiliations''': Filippo Montevecchi, Niccolò Grossi, Hisataka Takagi, Antonio Scippa, Hiroyuki Sasahara, Gianni Campatelli

'''Keyword''': Machinability; Milling; Cutting; Force

'''Purpose''': The objective of this work is providing a comparison between cutting forces in milling AM and wrought AISI H13 steel.

'''Design/methodology/approach''': The analysis was carried out for two different AM technologies: Laser-Engineered-Net-Shaping (LENS) and Wire-Arc-Additive-Manufacturing (WAAM). The analyzed material was AISI H13. Then Milling tests were carried out on wrought, LENS and WAAM specimens measuring the cutting forces with a table dynamometer. Measured cutting forces were used to compute cutting force coefficients as defined in Altintas et al. mechanistic cutting force model.

'''Findings''': cutting force values are significantly higher in LENS and WAAM material.

'''Practical implications''': this work highlights that AISI H13 AM material are harder to be machined, compared to the same material at wrought state. Indeed, results show a significant increase of cutting forces and cutting force coefficients. So a more powerful machine is needed, or a specific definition of cutting parameters for milling operation of AM parts.

'''Full reference''': MONTEVECCHI, Filippo, et al. Cutting forces analysis in additive manufactured AISI H13 alloy. Procedia Cirp, 2016, 46: 476-479.

'''Link''': [http://www.sciencedirect.com/science/article/pii/S2212827116301895 www.sciencedirect.com/science/article/pii/S2212827116301895]

Wire Arc Additive Manifacturing

2020-01-08T17:32:55Z

GiacomoTarabella:

*[[Finite element modelling of Wire-Arc-Additive-Manufacturing process]]
*[[Selection of optimal process parameters for wire arc additive manufacturing]]
*[[Cutting forces analysis in additive manufactured AISI H13 alloy]]

Selection of optimal process parameters for wire arc additive manufacturing

2020-01-08T17:32:00Z

GiacomoTarabella:

'''Authors''': Mariacira Liberini, Antonello Astarita, Gianni Campatelli, Antonio Scippa, Filippo Montevecchi, Giuseppe Venturini, Massimo Durante, Luca Boccarusso, Fabrizio Memola Capece Minutolo, A. Squillace

'''Keywords''': Wire arc additive manufacturing; ER70S-6 Steel; Microstructure; Vickers hardness.

'''Purpose''': the purpose is to define the effect of process parameters on the final microstructure of the product obtained in order to choose the optimal setup. The process parameters varied within the tests has been chosen in order to vary both the heat input of the process and the heat flux in a specific product area.

'''Design/methodology/approach''': The test samples were made by depositing successive layers of materials on a low carbon steel substrate. The filler material used is a standard filler for welding structural steels: ER70S-6 designation according AWS legislation. The test samples were made by superimposing 15 layers. A pause of 60s was imposed between each layer deposition, in order to enable a partial cooling of the deposited material. In the execution of the specimens it was maintained a distance of 10 mm between the torch and the work surface. All the samples are cooled in calm air at room temperature.

'''Findings''': in all the samples have been noted three different zones: the lower zone characterized by a ferritic structure with thin strips of pearlite, the middle zones characterized by equiaxed grains of ferrite and the upper zone characterized by a lamellar structure typically bainitic.

'''Practical implications''': it’s possible to obtain a structure ferrite/bainite according to the needs required by the final product.

'''Full reference''': LIBERINI, Mariacira, et al. Selection of optimal process parameters for wire arc additive manufacturing. Procedia Cirp, 2017, 62: 470-474.

'''Link''': [http://www.sciencedirect.com/science/article/pii/S2212827117301968 www.sciencedirect.com/science/article/pii/S2212827117301968]
[[File:Microstructure of the samples.png|miniatura]]

Selection of optimal process parameters for wire arc additive manufacturing

2020-01-08T17:30:32Z

GiacomoTarabella:

'''Authors''': Mariacira Liberini, Antonello Astarita, Gianni Campatelli, Antonio Scippa, Filippo Montevecchi, Giuseppe Venturini, Massimo Durante, Luca Boccarusso, Fabrizio Memola Capece Minutolo, A. Squillace

'''Keywords''': Wire arc additive manufacturing; ER70S-6 Steel; Microstructure; Vickers hardness.

'''Purpose''': the purpose is to define the effect of process parameters on the final microstructure of the product obtained in order to choose the optimal setup. The process parameters varied within the tests has been chosen in order to vary both the heat input of the process and the heat flux in a specific product area.

'''Design/methodology/approach''': The test samples were made by depositing successive layers of materials on a low carbon steel substrate. The filler material used is a standard filler for welding structural steels: ER70S-6 designation according AWS legislation. The test samples were made by superimposing 15 layers. A pause of 60s was imposed between each layer deposition, in order to enable a partial cooling of the deposited material. In the execution of the specimens it was maintained a distance of 10 mm between the torch and the work surface. All the samples are cooled in calm air at room temperature.

'''Findings''': in all the samples have been noted three different zones: the lower zone characterized by a ferritic structure with thin strips of pearlite, the middle zones characterized by equiaxed grains of ferrite and the upper zone characterized by a lamellar structure typically bainitic.

'''Practical implications''': it’s possible to obtain a structure ferrite/bainite according to the needs required by the final product.

'''Full reference ''': LIBERINI, Mariacira, et al. Selection of optimal process parameters for wire arc additive manufacturing. Procedia Cirp, 2017, 62: 470-474.

''' Link ''': [http://www.sciencedirect.com/science/article/pii/S2212827117301968 www.sciencedirect.com/science/article/pii/S2212827117301968]
[[File:Microstructure of the samples.png|miniatura]]

Finite element modelling of Wire-Arc-Additive-Manufacturing process

2020-01-08T17:30:04Z

GiacomoTarabella:

'''Authors''': Filippo Montevecchi, Giuseppe Venturini, Antonio Scippa, Gianni Campatelli

'''Keywords''': Welding; Finite element method (FEM)

'''Purpose''': Obtain more accurate results with a WAAM modelling strategy based on a novel heat source model that takes into account the actual power distribution between filler and base materials.

'''Design/methodology/approach''': the heat transfer from the arc to the molten pool is simulated using a heat source model, which prescribes a heat generation per unit volume in the molten pool region. Material deposition is taken into account by means of specific elements activation algorithms.
In this paper, the WAAM process is simulated using a novel definition of the heat source, based on a modified Goldak model, in order to have a more realistic heat flow distribution in the filler material.

'''Findings''': this model has a better correlation with the experimental results than the previous models.

'''Benefits''': proposed modelling results are in general agreement with the experimental ones, allowing to achieve an higher accuracy with respect to the traditional technique.

'''Practical implications''': proposed process modelling allows to accurately simulate the WAAM process, without the need to perform time-consuming tuning operations to identify heat source parameters.

[[File:Finite element Modelling.png|miniatura]]

'''Full reference''': MONTEVECCHI, Filippo, et al. Finite element modelling of wire-arc-additive-manufacturing process. Procedia Cirp, 2016, 55: 109-114.

'''Link''': [http://www.sciencedirect.com/science/article/pii/S2212827116309131 www.sciencedirect.com/science/article/pii/S2212827116309131]

Selection of optimal process parameters for wire arc additive manufacturing

2020-01-08T17:28:57Z

GiacomoTarabella:

'''Authors''': Mariacira Liberini, Antonello Astarita, Gianni Campatelli, Antonio Scippa, Filippo Montevecchi, Giuseppe Venturini, Massimo Durante, Luca Boccarusso, Fabrizio Memola Capece Minutolo, A. Squillace

'''Keywords''': Wire arc additive manufacturing; ER70S-6 Steel; Microstructure; Vickers hardness.

'''Purpose''': the purpose is to define the effect of process parameters on the final microstructure of the product obtained in order to choose the optimal setup. The process parameters varied within the tests has been chosen in order to vary both the heat input of the process and the heat flux in a specific product area.

'''Design/methodology/approach''': The test samples were made by depositing successive layers of materials on a low carbon steel substrate. The filler material used is a standard filler for welding structural steels: ER70S-6 designation according AWS legislation. The test samples were made by superimposing 15 layers. A pause of 60s was imposed between each layer deposition, in order to enable a partial cooling of the deposited material. In the execution of the specimens it was maintained a distance of 10 mm between the torch and the work surface. All the samples are cooled in calm air at room temperature.

'''Findings''': in all the samples have been noted three different zones: the lower zone characterized by a ferritic structure with thin strips of pearlite, the middle zones characterized by equiaxed grains of ferrite and the upper zone characterized by a lamellar structure typically bainitic.

'''Practical implications''': it’s possible to obtain a structure ferrite/bainite according to the needs required by the final product.

'''Full reference ''': LIBERINI, Mariacira, et al. Selection of optimal process parameters for wire arc additive manufacturing. Procedia Cirp, 2017, 62: 470-474.

''' Link ''' : [http://www.sciencedirect.com/science/article/pii/S2212827117301968 www.sciencedirect.com/science/article/pii/S2212827117301968]
[[File:Microstructure of the samples.png|miniatura]]

Selection of optimal process parameters for wire arc additive manufacturing

2020-01-08T17:28:01Z

GiacomoTarabella:

'''Authors''': Mariacira Liberini, Antonello Astarita, Gianni Campatelli, Antonio Scippa, Filippo Montevecchi, Giuseppe Venturini, Massimo Durante, Luca Boccarusso, Fabrizio Memola Capece Minutolo, A. Squillace

'''Keywords''': Wire arc additive manufacturing; ER70S-6 Steel; Microstructure; Vickers hardness.

'''Purpose''': the purpose is to define the effect of process parameters on the final microstructure of the product obtained in order to choose the optimal setup. The process parameters varied within the tests has been chosen in order to vary both the heat input of the process and the heat flux in a specific product area.

'''Design/methodology/approach''': The test samples were made by depositing successive layers of materials on a low carbon steel substrate. The filler material used is a standard filler for welding structural steels: ER70S-6 designation according AWS legislation. The test samples were made by superimposing 15 layers. A pause of 60s was imposed between each layer deposition, in order to enable a partial cooling of the deposited material. In the execution of the specimens it was maintained a distance of 10 mm between the torch and the work surface. All the samples are cooled in calm air at room temperature.

'''Findings''': in all the samples have been noted three different zones: the lower zone characterized by a ferritic structure with thin strips of pearlite, the middle zones characterized by equiaxed grains of ferrite and the upper zone characterized by a lamellar structure typically bainitic.

'''Practical implications''': it’s possible to obtain a structure ferrite/bainite according to the needs required by the final product.

'''Full reference ''': Liberini, M., Astarita, A., Campatelli, G., Scippa, A., Montevecchi, F., Venturini, G., ... & Squillace, A. (2017). Selection of optimal process parameters for wire arc additive manufacturing. Procedia Cirp, 62, 470-474.

''' Link ''' : [http://www.sciencedirect.com/science/article/pii/S2212827117301968 www.sciencedirect.com/science/article/pii/S2212827117301968]
[[File:Microstructure of the samples.png|miniatura]]

Finite element modelling of Wire-Arc-Additive-Manufacturing process

2020-01-08T17:26:43Z

GiacomoTarabella:

'''Authors''': Filippo Montevecchi, Giuseppe Venturini, Antonio Scippa, Gianni Campatelli

'''Keywords''': Welding; Finite element method (FEM)

'''Purpose''': Obtain more accurate results with a WAAM modelling strategy based on a novel heat source model that takes into account the actual power distribution between filler and base materials.

'''Design/methodology/approach''': the heat transfer from the arc to the molten pool is simulated using a heat source model, which prescribes a heat generation per unit volume in the molten pool region. Material deposition is taken into account by means of specific elements activation algorithms.
In this paper, the WAAM process is simulated using a novel definition of the heat source, based on a modified Goldak model, in order to have a more realistic heat flow distribution in the filler material.

'''Findings''': this model has a better correlation with the experimental results than the previous models.

'''Benefits''': proposed modelling results are in general agreement with the experimental ones, allowing to achieve an higher accuracy with respect to the traditional technique.

'''Practical implications''': proposed process modelling allows to accurately simulate the WAAM process, without the need to perform time-consuming tuning operations to identify heat source parameters.

[[File:Finite element Modelling.png|miniatura]]

'''Full reference''': Montevecchi, F., Venturini, G., Scippa, A., & Campatelli, G. (2016). Finite element modelling of wire-arc-additive-manufacturing process. Procedia Cirp, 55, 109-114.

'''Link''': [http://www.sciencedirect.com/science/article/pii/S2212827116309131 www.sciencedirect.com/science/article/pii/S2212827116309131]

Finite element modelling of Wire-Arc-Additive-Manufacturing process

2020-01-08T17:26:03Z

GiacomoTarabella:

'''Authors''': Filippo Montevecchi, Giuseppe Venturini, Antonio Scippa, Gianni Campatelli

'''Keywords''': Welding; Finite element method (FEM)

'''Purpose''': Obtain more accurate results with a WAAM modelling strategy based on a novel heat source model that takes into account the actual power distribution between filler and base materials.

'''Design/methodology/approach''': the heat transfer from the arc to the molten pool is simulated using a heat source model, which prescribes a heat generation per unit volume in the molten pool region. Material deposition is taken into account by means of specific elements activation algorithms.
In this paper, the WAAM process is simulated using a novel definition of the heat source, based on a modified Goldak model, in order to have a more realistic heat flow distribution in the filler material.

'''Findings''': this model has a better correlation with the experimental results than the previous models.

'''Benefits''': proposed modelling results are in general agreement with the experimental ones, allowing to achieve an higher accuracy with respect to the traditional technique.

'''Practical implications''': proposed process modelling allows to accurately simulate the WAAM process, without the need to perform time-consuming tuning operations to identify heat source parameters.

[[File:Finite element Modelling.png|miniatura]]

'''Full reference''': Procedia CIRP 55

'''Link''': [http://www.sciencedirect.com/science/article/pii/S2212827116309131 www.sciencedirect.com/science/article/pii/S2212827116309131]

Selection of optimal process parameters for wire arc additive manufacturing

2020-01-08T17:04:50Z

GiacomoTarabella: Creata pagina con "'''Title''': Selection of optimal process parameters for wire arc additive manufacturing '''Authors''': Mariacira Liberini, Antonello Astarita, Gianni Campatelli , Antonio Sc..."

'''Title''': Selection of optimal process parameters for wire arc additive manufacturing

'''Authors''': Mariacira Liberini, Antonello Astarita, Gianni Campatelli , Antonio Scippa , Filippo Montevecchi, Giuseppe Venturini , Massimo Durante , Luca Boccarusso , Fabrizio Memola Capece Minutolo , A. Squillace

'''Keywords''': Wire arc additive manufacturing; ER70S-6 Steel; Microstructure; Vickers hardness.

'''Abstract''': This paper is about the optimal selection of process parameters for Wire Arc Additive Manufacturing technology. In particular, the selection of the process parameters is based on the evolution of the microstructure and on the mechanical properties of the final samples obtained through the successive deposition weld beads of a ER70S-6 steel. The feed rate and the heat input during the deposition of the weld beads have been varied, in order to understand how the temperature reached by the samples can affect the final product mechanical characteristics. The final cooling has been carried in calm air at room temperature and between the deposition of a weld bead and the following one it has been imposed a pause of 60s. The tests on mechanical properties carried out have been a full experimental campaign that includes: macrographic observations, micrographic observations and Vickers microhardness. The analysis of these tests has highligthed that by varying the process parameters, the samples do not have substantial differences between them. Instead, a microstructure that evolves from pearlitic-ferritic grains until bainitic lamellae along the vertical direction of the samples has been observed by micrographic analysis.

'''Purpose''': the purpose is to define the effect of process parameters on the final microstructure of the product obtained in order to choose the optimal setup. The process parameters varied within the tests has been chosen in order to vary both the heat input of the process and the heat flux in a specific product area.

'''Design/methodology/approach''': The test samples were made by depositing successive layers of materials on a low carbon steel substrate. The filler material used is a standard filler for welding structural steels: ER70S-6 designation according AWS legislation. The test samples were made by superimposing 15 layers. A pause of 60s was imposed between each layer deposition, in order to enable a partial cooling of the deposited material. In the execution of the specimens it was maintained a distance of 10 mm between the torch and the work surface. All the samples are cooled in calm air at room temperature.

'''Findings''': in all the samples have been noted three different zones: the lower zone characterized by a ferritic structure with thin strips of pearlite, the middle zones characterized by equiaxed grains of ferrite and the upper zone characterized by a lamellar structure typically bainitic.

'''Practical implications''': it’s possible to obtain a structure ferrite/bainite according to the needs required by the final product.

'''Full reference ''': Procedia CIRP 62

''' Link ''' : www.sciencedirect.com/science/article/pii/S2212827117301968
[[File:Microstructure of the samples.png|miniatura]]

File:Microstructure of the samples.png

2020-01-08T17:04:34Z

GiacomoTarabella:

Different Microstructure from pearlitic to bainitic

Wire Arc Additive Manifacturing

2020-01-08T17:00:37Z

GiacomoTarabella:

*[[Finite element modelling of Wire-Arc-Additive-Manufacturing process]]
*[[Selection of optimal process parameters for wire arc additive manufacturing]]

Finite element modelling of Wire-Arc-Additive-Manufacturing process

2020-01-08T17:00:01Z

GiacomoTarabella: Creata pagina con "'''Title''': Finite element modelling of Wire-Arc-Additive-Manufacturing process '''Authors''': Filippo Montevecchi, Giuseppe Venturini , Antonio Scippa , Gianni Campatelli..."

'''Title''': Finite element modelling of Wire-Arc-Additive-Manufacturing process

'''Authors''': Filippo Montevecchi, Giuseppe Venturini , Antonio Scippa , Gianni Campatelli

'''Keywords''': Welding; Finite element method (FEM)

'''Abstract''': Wire-Arc-Additive-Manufacturing (WAAM) is an Additive-Manufacturing (AM) process, allowing to produce metal components layer by layer by means of Gas-Metal-Arc-Welding (GMAW) technology. The advantages of this technology are the capability to create large parts with a higher deposition rate, but the disadvantages are that WAAM components are affected by severe distortions and residual stresses issues. Process simulation is a powerful tool to tackle such issues, allowing to test the effect of different deposition patterns on residual stresses field, optimizing the process.

'''Purpose''': Obtain more accurate results with a WAAM modelling strategy based on a novel heat source model that takes into account the actual power distribution between filler and base materials.

'''Design/methodology/approach''': the heat transfer from the arc to the molten pool is simulated using a heat source model, which prescribes a heat generation per unit volume in the molten pool region. Material deposition is taken into account by means of specific elements activation algorithms.
In this paper, the WAAM process is simulated using a novel definition of the heat source, based on a modified Goldak model, in order to have a more realistic heat flow distribution in the filler material.

'''Findings''': this model has a better correlation with the experimental results than the previous models.

'''Benefits''': proposed modelling results are in general agreement with the experimental ones, allowing to achieve an higher accuracy with respect to the traditional technique.

'''Practical implications''': proposed process modelling allows to accurately simulate the WAAM process, without the need to perform time-consuming tuning operations to identify heat source parameters.

[[File:Finite element Modelling.png|miniatura]]

'''Full reference''': Procedia CIRP 55

'''Link''': www.sciencedirect.com/science/article/pii/S2212827116309131

Wire Arc Additive Manifacturing

2020-01-08T16:59:51Z

GiacomoTarabella: Pagina sostituita con '*Finite element modelling of Wire-Arc-Additive-Manufacturing process'

*[[Finite element modelling of Wire-Arc-Additive-Manufacturing process]]

Cutting forces analysis in additive manufactured AISI H13 alloy

2020-01-08T16:59:00Z

GiacomoTarabella: Creata pagina con "'''Title''': Cutting forces analysis in additive manufactured AISI H13 alloy '''Authors and full affiliations''': Filippo Montevecchi, Niccolò Grossi, Hisataka Takagi, Anton..."

'''Title''': Cutting forces analysis in additive manufactured AISI H13 alloy

'''Authors and full affiliations''': Filippo Montevecchi, Niccolò Grossi, Hisataka Takagi, Antonio Scippa, Hiroyuki Sasahara, Gianni Campatelli

'''Keyword''': Machinability; Milling; Cutting; Force

'''Abstract''': Combining Additive Manufacturing (AM) and traditional machining processes is essential to meet components functional requirements. However significant differences arise in machining AM and wrought parts. Previous works highlighted the increasing of tool wear and worse surface finish. In this paper cutting forces are investigated as an indicator of material machinability. Milling cutting force coefficients are identified using mechanistic approach, comparing AISI-H13 wrought and AM specimen. Cutting force behaviour was investigated for two AM technologies: laser deposition (LENS) and wire-arc additive manufacturing (WAAM). Results show a general increase of cutting forces and coefficients of both AM materials, suggesting AM parts reduced machinability. Therefore, different cutting parameters should be selected for the AM material to achieve a sustainable production.

'''Purpose''': The objective of this work is providing a comparison between cutting forces in milling AM and wrought AISI H13 steel.

'''Design/methodology/approach''': The analysis was carried out for two different AM technologies: Laser-Engineered-Net-Shaping (LENS) and Wire-Arc-Additive-Manufacturing (WAAM). The analyzed material was AISI H13. Then Milling tests were carried out on wrought, LENS and WAAM specimens measuring the cutting forces with a table dynamometer. Measured cutting forces were used to compute cutting force coefficients as defined in Altintas et al. mechanistic cutting force model.

'''Findings''': cutting force values are significantly higher in LENS and WAAM material.

'''Practical implications''': this work highlights that AISI H13 AM material are harder to be machined, compared to the same material at wrought state. Indeed, results show a significant increase of cutting forces and cutting force coefficients. So a more powerful machine is needed, or a specific definition of cutting parameters for milling operation of AM parts.

'''Full reference''': Procedia CIRP 46

'''Link''': www.sciencedirect.com/science/article/pii/S2212827116301895

Cutting Forces Additive Manifacturing

2020-01-08T16:57:44Z

GiacomoTarabella: Creata pagina con "*Cutting forces analysis in additive manufactured AISI H13 alloy"

*[[Cutting forces analysis in additive manufactured AISI H13 alloy]]

Main Page

2020-01-08T16:56:46Z

GiacomoTarabella: /* Processes */

=[[Materials]]=
=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Laser Machining]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]
*[[Cutting Forces Additive Manifacturing]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[Components made AM]]

=[[Literature about AM]]=
*[[Impact of additive manufacturing on engineering education]]

[[Speciale:CreaUtenza]]

Wire Arc Additive Manifacturing

2020-01-08T16:54:25Z

GiacomoTarabella:

Wire Arc Additive Manifacturing

2020-01-08T16:54:07Z

GiacomoTarabella:

'''Title''': Finite element modelling of Wire-Arc-Additive-Manufacturing process

'''Authors''': Filippo Montevecchi, Giuseppe Venturini , Antonio Scippa , Gianni Campatelli

'''Keywords''': Welding; Finite element method (FEM)

'''Abstract''': Wire-Arc-Additive-Manufacturing (WAAM) is an Additive-Manufacturing (AM) process, allowing to produce metal components layer by layer by means of Gas-Metal-Arc-Welding (GMAW) technology. The advantages of this technology are the capability to create large parts with a higher deposition rate, but the disadvantages are that WAAM components are affected by severe distortions and residual stresses issues. Process simulation is a powerful tool to tackle such issues, allowing to test the effect of different deposition patterns on residual stresses field, optimizing the process.

'''Purpose''': Obtain more accurate results with a WAAM modelling strategy based on a novel heat source model that takes into account the actual power distribution between filler and base materials.

'''Design/methodology/approach''': the heat transfer from the arc to the molten pool is simulated using a heat source model, which prescribes a heat generation per unit volume in the molten pool region. Material deposition is taken into account by means of specific elements activation algorithms.
In this paper, the WAAM process is simulated using a novel definition of the heat source, based on a modified Goldak model, in order to have a more realistic heat flow distribution in the filler material.

'''Findings''': this model has a better correlation with the experimental results than the previous models.

'''Benefits''': proposed modelling results are in general agreement with the experimental ones, allowing to achieve an higher accuracy with respect to the traditional technique.

'''Practical implications''': proposed process modelling allows to accurately simulate the WAAM process, without the need to perform time-consuming tuning operations to identify heat source parameters.

'''Graphical abstract''':
[[File:Finite element Modelling.png|miniatura]]

'''Full reference''': Procedia CIRP 55

'''Link''': www.sciencedirect.com/science/article/pii/S2212827116309131

File:Finite element Modelling.png

2020-01-08T16:53:46Z

GiacomoTarabella:

This picture shows the new model adopted to simulate the process

Wire Arc Additive Manifacturing

2020-01-08T16:51:26Z

'''Title''': Finite element modelling of Wire-Arc-Additive-Manufacturing process

'''Authors''': Filippo Montevecchi, Giuseppe Venturini , Antonio Scippa , Gianni Campatelli

'''Keywords''': Welding; Finite element method (FEM)

'''Abstract''': Wire-Arc-Additive-Manufacturing (WAAM) is an Additive-Manufacturing (AM) process, allowing to produce metal components layer by layer by means of Gas-Metal-Arc-Welding (GMAW) technology. The advantages of this technology are the capability to create large parts with a higher deposition rate, but the disadvantages are that WAAM components are affected by severe distortions and residual stresses issues. Process simulation is a powerful tool to tackle such issues, allowing to test the effect of different deposition patterns on residual stresses field, optimizing the process.

'''Purpose''': Obtain more accurate results with a WAAM modelling strategy based on a novel heat source model that takes into account the actual power distribution between filler and base materials.

'''Design/methodology/approach''': the heat transfer from the arc to the molten pool is simulated using a heat source model, which prescribes a heat generation per unit volume in the molten pool region. Material deposition is taken into account by means of specific elements activation algorithms.
In this paper, the WAAM process is simulated using a novel definition of the heat source, based on a modified Goldak model, in order to have a more realistic heat flow distribution in the filler material.

'''Findings''': this model has a better correlation with the experimental results than the previous models.

'''Benefits''': proposed modelling results are in general agreement with the experimental ones, allowing to achieve an higher accuracy with respect to the traditional technique.

'''Practical implications''': proposed process modelling allows to accurately simulate the WAAM process, without the need to perform time-consuming tuning operations to identify heat source parameters.

'''Graphical abstract''':

'''Full reference''': Procedia CIRP 55

'''Link''': www.sciencedirect.com/science/article/pii/S2212827116309131

Main Page

2020-01-08T16:48:17Z

GiacomoTarabella: /* Processes */

=[[Materials]]=
=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Laser Machining]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[Components made AM]]

=[[Literature about AM]]=
*[[Impact of additive manufacturing on engineering education]]

[[Speciale:CreaUtenza]]