The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Huaming Wang - One of the best experts on this subject based on the ideXlab platform.
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high temperature sliding wear resistance of a Ductile Metal toughened cr13ni5si2 ternary Metal silicide alloy
Journal of Alloys and Compounds, 2007Co-Authors: Y L Fang, Huaming WangAbstract:Abstract High-temperature Metallic sliding wear resistance and mechanisms of a Cr 13 Ni 5 Si 2 ternary Metal silicide alloy toughened by small amount of interdendritic nickel-based solid solution (γ) were studied as a function of wear test temperature. The γ-toughened Cr 13 Ni 5 Si 2 alloy has excellent wear resistance under high-temperature sliding wear test conditions. Wear volume loss of the Cr 13 Ni 5 Si 2 alloy was very low and was even slightly decreased with increasing test temperature. The Ductile interdendritic γ-phase played a positive role in reducing the wear volume loss of the γ-toughened Cr 13 Ni 5 Si 2 alloy by prohibiting crack propagation and preventing pulling-out of the broken Cr 13 Ni 5 Si 2 fragments from the worn surface.
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a wear resistant Ductile Metal toughened cr13ni5si2 ternary Metal silicide alloy
Intermetallics, 2006Co-Authors: Y L Fang, H B Tang, Huaming WangAbstract:Abstract A Ductile Metal-toughened Cr–Ni–Si ternary Metal silicide wear resistant alloy with a dual-phase microstructure consisting of Cr13Ni5Si2 ternary Metal silicide primary dendrites and the interdendritic nickel-base solid solution (γ) was designed and fabricated by the laser melting/continuous deposition process. Wear resistance of the γ-toughened Cr13Ni5Si2 interMetallic alloy was evaluated on an MM-200 block-on-wheel dry sliding wear tester at room temperature. The γ-toughened Cr13Ni5Si2 interMetallic alloy has excellent wear resistance and extremely low load-sensitivity of wear under dry sliding wear test conditions due to the inherent high hardness, abnormal hardness–temperature relation and strong covalent-dominant atomic bonds. The isolated toughening γ phase played a positive role in reducing volume wear rate by retarding crack propagation and preventing pull-out of the broken Cr13Ni5Si2 fragments from the wear surface.
Y L Fang - One of the best experts on this subject based on the ideXlab platform.
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high temperature sliding wear resistance of a Ductile Metal toughened cr13ni5si2 ternary Metal silicide alloy
Journal of Alloys and Compounds, 2007Co-Authors: Y L Fang, Huaming WangAbstract:Abstract High-temperature Metallic sliding wear resistance and mechanisms of a Cr 13 Ni 5 Si 2 ternary Metal silicide alloy toughened by small amount of interdendritic nickel-based solid solution (γ) were studied as a function of wear test temperature. The γ-toughened Cr 13 Ni 5 Si 2 alloy has excellent wear resistance under high-temperature sliding wear test conditions. Wear volume loss of the Cr 13 Ni 5 Si 2 alloy was very low and was even slightly decreased with increasing test temperature. The Ductile interdendritic γ-phase played a positive role in reducing the wear volume loss of the γ-toughened Cr 13 Ni 5 Si 2 alloy by prohibiting crack propagation and preventing pulling-out of the broken Cr 13 Ni 5 Si 2 fragments from the worn surface.
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a wear resistant Ductile Metal toughened cr13ni5si2 ternary Metal silicide alloy
Intermetallics, 2006Co-Authors: Y L Fang, H B Tang, Huaming WangAbstract:Abstract A Ductile Metal-toughened Cr–Ni–Si ternary Metal silicide wear resistant alloy with a dual-phase microstructure consisting of Cr13Ni5Si2 ternary Metal silicide primary dendrites and the interdendritic nickel-base solid solution (γ) was designed and fabricated by the laser melting/continuous deposition process. Wear resistance of the γ-toughened Cr13Ni5Si2 interMetallic alloy was evaluated on an MM-200 block-on-wheel dry sliding wear tester at room temperature. The γ-toughened Cr13Ni5Si2 interMetallic alloy has excellent wear resistance and extremely low load-sensitivity of wear under dry sliding wear test conditions due to the inherent high hardness, abnormal hardness–temperature relation and strong covalent-dominant atomic bonds. The isolated toughening γ phase played a positive role in reducing volume wear rate by retarding crack propagation and preventing pull-out of the broken Cr13Ni5Si2 fragments from the wear surface.
H B Tang - One of the best experts on this subject based on the ideXlab platform.
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a wear resistant Ductile Metal toughened cr13ni5si2 ternary Metal silicide alloy
Intermetallics, 2006Co-Authors: Y L Fang, H B Tang, Huaming WangAbstract:Abstract A Ductile Metal-toughened Cr–Ni–Si ternary Metal silicide wear resistant alloy with a dual-phase microstructure consisting of Cr13Ni5Si2 ternary Metal silicide primary dendrites and the interdendritic nickel-base solid solution (γ) was designed and fabricated by the laser melting/continuous deposition process. Wear resistance of the γ-toughened Cr13Ni5Si2 interMetallic alloy was evaluated on an MM-200 block-on-wheel dry sliding wear tester at room temperature. The γ-toughened Cr13Ni5Si2 interMetallic alloy has excellent wear resistance and extremely low load-sensitivity of wear under dry sliding wear test conditions due to the inherent high hardness, abnormal hardness–temperature relation and strong covalent-dominant atomic bonds. The isolated toughening γ phase played a positive role in reducing volume wear rate by retarding crack propagation and preventing pull-out of the broken Cr13Ni5Si2 fragments from the wear surface.
Christopher L. Muhlstein - One of the best experts on this subject based on the ideXlab platform.
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The development of zones of active plasticity during mode I steady-state crack growth in thin aluminum sheets
Engineering Fracture Mechanics, 2019Co-Authors: Syed Saad Javaid, Wade R. Lanning, Christopher L. MuhlsteinAbstract:Abstract Cracks grow in millimeter-scale, Ductile Metal sheets when a transverse neck fracture process zone fails by microvoid coalescence. Here we showed that the crack growth mechanism changed to a different steady-state process when sheet thicknesses were ⪅100 μm. We experimentally quantified the shape, extent, and evolution of the process zones in 1235 Al and showed that three zones were operating: A large, uncontained plastic zone (PZ) ahead of the crack tip had an embedded, steady-state zone of active plasticity (ZAP) that surrounded a transverse neck fracture process zone (FPZ) which failed via a microvoid-free shear mechanism.
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Mode I steady-state crack propagation through a fully-yielded ligament in thin Ductile Metal foils
Theoretical and Applied Fracture Mechanics, 2019Co-Authors: Wade R. Lanning, Syed Saad Javaid, Camilla E. Johnson, Christopher L. MuhlsteinAbstract:Abstract Steady-state crack propagation is the advance of a self-similar crack tip with a constant driving force. Though steady-state growth is often described with analytical models, it is rarely experimentally observed or characterized under quasi-static loading conditions. Thin Ductile Metal sheets, such as the 25.4 μm, 50.8 μm, and 127 μm thick 1235 aluminum specimens used in this study, exhibit steady-state crack propagation but cannot be characterized by conventional linear-elastic (K) or elastic-plastic (J) crack tip parameters that require contained crack tip plastic zones. Instead we used a fully-yielded plastic crack growth resistance analysis (i.e., ligament stresses were above the tensile yield stress) to identify when cracks in thin aluminum sheet specimens reached steady-state propagation conditions. At steady-state a constant, characteristic crack growth resistance, σ c was observed for each sheet thickness ( σ c 25.4 μ m = 60 MPa , σ c 50.8 μ m = 95 MPa , and σ c 127 μ m = 93 MPa ). This σ c -controlled crack growth is dramatically different from conventional linear elastic and elastic plastic crack growth because the plastic zone is uncontained and extends across the remaining ligament.
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reconciling fracture toughness parameter contradictions in thin Ductile Metal sheets
Fatigue & Fracture of Engineering Materials & Structures, 2017Co-Authors: Wade R. Lanning, Syed Saad Javaid, Christopher L. MuhlsteinAbstract:This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purpose.
John W. Hutchinson - One of the best experts on this subject based on the ideXlab platform.
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cohesive traction separation laws for tearing of Ductile Metal plates
International Journal of Impact Engineering, 2012Co-Authors: Kim Lau Nielsen, John W. HutchinsonAbstract:Abstract The failure process ahead of a mode I crack advancing in a Ductile thin Metal plate or sheet produces plastic dissipation through a sequence of deformation steps that include necking well ahead of the crack tip and shear localization followed by a slant fracture in the necked region somewhat closer to the tip. The objective of this paper is to analyze this sequential process to characterize the traction–separation behavior and the associated effective cohesive fracture energy of the entire failure process. The emphasis is on what is often described as plane stress behavior taking place after the crack tip has advanced a distance of one or two plate thicknesses. Traction–separation laws are an essential component of finite element methods currently under development for analyzing fracture of large scale plate or shell structures. The present study resolves the sequence of failure details using the Gurson constitutive law based on the micromechanics of the Ductile fracture process, including a recent extension that accounts for damage growth in shear. The fracture process in front of an advancing crack, subject to overall mode I loading, is approximated by a 2D plane strain finite element model, which allows for an intensive study of the parameters influencing local necking, shear localization and the final slant failure. The deformation history relevant to a cohesive zone for a large scale model is identified and the traction–separation relation is determined, including the dissipated energy. For Ductile structural materials, the dissipation generated during necking prior to the onset of shear localization is the dominant contribution; it scales with the plate thickness and is mesh-independent in the present numerical model. The energy associated with the shear localization and fracture is secondary; it scales with the width of the shear band, and inherits the finite element mesh dependency of the Gurson model. The cohesive traction–separation laws have been characterized for various material conditions.
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Cohesive traction–separation laws for tearing of Ductile Metal plates
International Journal of Impact Engineering, 2012Co-Authors: Kim Lau Nielsen, John W. HutchinsonAbstract:Abstract The failure process ahead of a mode I crack advancing in a Ductile thin Metal plate or sheet produces plastic dissipation through a sequence of deformation steps that include necking well ahead of the crack tip and shear localization followed by a slant fracture in the necked region somewhat closer to the tip. The objective of this paper is to analyze this sequential process to characterize the traction–separation behavior and the associated effective cohesive fracture energy of the entire failure process. The emphasis is on what is often described as plane stress behavior taking place after the crack tip has advanced a distance of one or two plate thicknesses. Traction–separation laws are an essential component of finite element methods currently under development for analyzing fracture of large scale plate or shell structures. The present study resolves the sequence of failure details using the Gurson constitutive law based on the micromechanics of the Ductile fracture process, including a recent extension that accounts for damage growth in shear. The fracture process in front of an advancing crack, subject to overall mode I loading, is approximated by a 2D plane strain finite element model, which allows for an intensive study of the parameters influencing local necking, shear localization and the final slant failure. The deformation history relevant to a cohesive zone for a large scale model is identified and the traction–separation relation is determined, including the dissipated energy. For Ductile structural materials, the dissipation generated during necking prior to the onset of shear localization is the dominant contribution; it scales with the plate thickness and is mesh-independent in the present numerical model. The energy associated with the shear localization and fracture is secondary; it scales with the width of the shear band, and inherits the finite element mesh dependency of the Gurson model. The cohesive traction–separation laws have been characterized for various material conditions.
