The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Xiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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fatigue Crack propagation behaviour in wire arc additive manufactured ti 6al 4v effects of microstructure and residual stress
Materials & Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Abstract Fatigue Crack propagation tests of Ti‐6Al‐4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.
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Fatigue Crack propagation behaviour in wire+arc additive manufactured Ti-6Al-4V: Effects of microstructure and residual stress
Materials and Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Fatigue Crack propagation tests of Ti-6Al-4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.
Xueyuan Wang - One of the best experts on this subject based on the ideXlab platform.
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fatigue Crack propagation behaviour in wire arc additive manufactured ti 6al 4v effects of microstructure and residual stress
Materials & Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Abstract Fatigue Crack propagation tests of Ti‐6Al‐4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.
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Fatigue Crack propagation behaviour in wire+arc additive manufactured Ti-6Al-4V: Effects of microstructure and residual stress
Materials and Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Fatigue Crack propagation tests of Ti-6Al-4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.
Jikui Zhang - One of the best experts on this subject based on the ideXlab platform.
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fatigue Crack propagation behaviour in wire arc additive manufactured ti 6al 4v effects of microstructure and residual stress
Materials & Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Abstract Fatigue Crack propagation tests of Ti‐6Al‐4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.
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Fatigue Crack propagation behaviour in wire+arc additive manufactured Ti-6Al-4V: Effects of microstructure and residual stress
Materials and Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Fatigue Crack propagation tests of Ti-6Al-4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.
A P Reynolds - One of the best experts on this subject based on the ideXlab platform.
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residual stress and microstructure effects on fatigue Crack growth in aa2050 friction stir welds
International Journal of Fatigue, 2008Co-Authors: G. Pouget, A P ReynoldsAbstract:Abstract In this work, results of a study conducted on fatigue Crack propagation in friction stir welded AA2050 and the effects of FSW induced residual stresses, as well as changes in the microstructure, are presented. Longitudinal residual stress profiles across butt welded 2050 plates were determined using the cut compliance technique and fatigue Crack growth testing was conducted on compact tension specimens machined from the friction stir welds. Tests were performed with the Crack propagating nominally perpendicular to the weld and with a constant, applied, cyclic, stress intensity factor. Two different material tempers were investigated and in both cases residual stresses were found to have a major effect on the fatigue Crack propagation. It was shown that compressive residual stresses are present in the vicinity of the weld, leading to Crack closure and a decrease in the fatigue Crack growth rate as the Crack approaches the weld. Once in the weld nugget, the Crack propagation rate increases. This increase is believed to be linked in part to tensile residual stresses but also to a microstructural effect present when the Crack Grows through the recrystallized nugget. It was also observed that other closure mechanisms, such as oxide-induced closure may affect the fatigue behavior of the 2050 FSW’s. Two methods to predict fatigue Crack growth rates in the weld zones were attempted: using the residual stress profiles determined by cut compliance and using the effective stress intensity factor, Δ K eff , obtained during fatigue Crack growth testing.
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Residual stress and microstructure effects on fatigue Crack growth in AA2050 friction stir welds
International Journal of Fatigue, 2008Co-Authors: G. Pouget, A P ReynoldsAbstract:In this work, results of a study conducted on fatigue Crack propagation in friction stir welded AA2050 and the effects of FSW induced residual stresses, as well as changes in the microstructure, are presented. Longitudinal residual stress profiles across butt welded 2050 plates were determined using the cut compliance technique and fatigue Crack growth testing was conducted on compact tension specimens machined from the friction stir welds. Tests were performed with the Crack propagating nominally perpendicular to the weld and with a constant, applied, cyclic, stress intensity factor. Two different material tempers were investigated and in both cases residual stresses were found to have a major effect on the fatigue Crack propagation. It was shown that compressive residual stresses are present in the vicinity of the weld, leading to Crack closure and a decrease in the fatigue Crack growth rate as the Crack approaches the weld. Once in the weld nugget, the Crack propagation rate increases. This increase is believed to be linked in part to tensile residual stresses but also to a microstructural effect present when the Crack Grows through the recrystallized nugget. It was also observed that other closure mechanisms, such as oxide-induced closure may affect the fatigue behavior of the 2050 FSW's. Two methods to predict fatigue Crack growth rates in the weld zones were attempted: using the residual stress profiles determined by cut compliance and using the effective stress intensity factor, ΔKeff, obtained during fatigue Crack growth testing. © 2007 Elsevier Ltd. All rights reserved.
Sanjooram Paddea - One of the best experts on this subject based on the ideXlab platform.
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fatigue Crack propagation behaviour in wire arc additive manufactured ti 6al 4v effects of microstructure and residual stress
Materials & Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Abstract Fatigue Crack propagation tests of Ti‐6Al‐4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.
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Fatigue Crack propagation behaviour in wire+arc additive manufactured Ti-6Al-4V: Effects of microstructure and residual stress
Materials and Design, 2016Co-Authors: Jikui Zhang, Sanjooram Paddea, Xueyuan Wang, Xiang ZhangAbstract:Fatigue Crack propagation tests of Ti-6Al-4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the Crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in Crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight Crack path, whereas the WAAM lamellar structure causes tortuous Crack path resulting in lower Crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on Crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial Crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial Crack is in the wrought substrate; hence it has little effect. In contrast, when Crack Grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater Crack growth rate.