The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Yanyao Jiang - One of the best experts on this subject based on the ideXlab platform.
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A study of loading path influence on fatigue Crack growth under combined loading
International Journal of Fatigue, 2006Co-Authors: Miaolin Feng, Fei Ding, Yanyao JiangAbstract:Abstract Single edge specimens made of 1070 steel were subjected to combined axial–torsion loading at room temperature. Three loading paths were designed to study the loading path influence on the Crack growth behavior. Path I was proportional loading and Path II was the loading case, where the torque decreased/increased with increasing/decreasing axial load. Path III followed a circular path in the axial load–torque coordinates. With identical load amplitudes, the Crack growth behavior was found to be critically dependent on the loading path. Path III resulted in the Fastest Crack growth rate and Path II produced the least Crack extension. Furthermore, the Crack profile was dependent on the loading path. Path III resulted in a Crack profile similar to that observed under Mode I loading. Significant branching and slant angles were observed for Paths I and II, with Path II in particular. Two existing models were discussed with respect to their capabilities to predict the Crack growth rate and Cracking direction for combined loading.
Samantha H. Daly - One of the best experts on this subject based on the ideXlab platform.
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Grain size effects on NiTi shape memory alloy fatigue Crack growth
Journal of Materials Research, 2018Co-Authors: William S. Lepage, Aslan Ahadi, William C. Lenthe, Qing-ping Sun, Tresa M. Pollock, John A. Shaw, Samantha H. DalyAbstract:Fatigue Cracking in polycrystalline NiTi was investigated using a multiscale experimental framework for average grain sizes (GS) from 10 to 1500 nm for the first time. Macroscopic fatigue Crack growth rates, measured by optical digital image correlation, were connected to microscopic Crack opening and closing displacements, measured by scanning electron microscope DIC (SEM-DIC) using a high-precision external SEM scan controller. Among all grain sizes, the 1500 nm GS sample exhibited the slowest Crack growth rate at the macroscale, and the largest Crack opening level (stress intensity at first Crack opening) and minimum Crack opening displacements at the microscale. Smaller GS samples (10, 18, 42, and 80 nm) exhibited nonmonotonic trends in their fatigue performance, yet the correlation was strong between macroscale and microscale behaviors for each GS. The samples that exhibited the Fastest Crack growth rates (42 and 80 nm GS) showed a small Crack opening level and the largest Crack opening displacements. The irregular trends in fatigue performance across the nanocrystalline GS samples were consistent with nonmonotonic values in the elastic modulus reported previously, both of which may be related to the presence of residual martensite only evident in the small GS samples (10 and 18 nm).
Miaolin Feng - One of the best experts on this subject based on the ideXlab platform.
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A study of loading path influence on fatigue Crack growth under combined loading
International Journal of Fatigue, 2006Co-Authors: Miaolin Feng, Fei Ding, Yanyao JiangAbstract:Abstract Single edge specimens made of 1070 steel were subjected to combined axial–torsion loading at room temperature. Three loading paths were designed to study the loading path influence on the Crack growth behavior. Path I was proportional loading and Path II was the loading case, where the torque decreased/increased with increasing/decreasing axial load. Path III followed a circular path in the axial load–torque coordinates. With identical load amplitudes, the Crack growth behavior was found to be critically dependent on the loading path. Path III resulted in the Fastest Crack growth rate and Path II produced the least Crack extension. Furthermore, the Crack profile was dependent on the loading path. Path III resulted in a Crack profile similar to that observed under Mode I loading. Significant branching and slant angles were observed for Paths I and II, with Path II in particular. Two existing models were discussed with respect to their capabilities to predict the Crack growth rate and Cracking direction for combined loading.
William S. Lepage - One of the best experts on this subject based on the ideXlab platform.
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Grain size effects on NiTi shape memory alloy fatigue Crack growth
Journal of Materials Research, 2018Co-Authors: William S. Lepage, Aslan Ahadi, William C. Lenthe, Qing-ping Sun, Tresa M. Pollock, John A. Shaw, Samantha H. DalyAbstract:Fatigue Cracking in polycrystalline NiTi was investigated using a multiscale experimental framework for average grain sizes (GS) from 10 to 1500 nm for the first time. Macroscopic fatigue Crack growth rates, measured by optical digital image correlation, were connected to microscopic Crack opening and closing displacements, measured by scanning electron microscope DIC (SEM-DIC) using a high-precision external SEM scan controller. Among all grain sizes, the 1500 nm GS sample exhibited the slowest Crack growth rate at the macroscale, and the largest Crack opening level (stress intensity at first Crack opening) and minimum Crack opening displacements at the microscale. Smaller GS samples (10, 18, 42, and 80 nm) exhibited nonmonotonic trends in their fatigue performance, yet the correlation was strong between macroscale and microscale behaviors for each GS. The samples that exhibited the Fastest Crack growth rates (42 and 80 nm GS) showed a small Crack opening level and the largest Crack opening displacements. The irregular trends in fatigue performance across the nanocrystalline GS samples were consistent with nonmonotonic values in the elastic modulus reported previously, both of which may be related to the presence of residual martensite only evident in the small GS samples (10 and 18 nm).
Fei Ding - One of the best experts on this subject based on the ideXlab platform.
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A study of loading path influence on fatigue Crack growth under combined loading
International Journal of Fatigue, 2006Co-Authors: Miaolin Feng, Fei Ding, Yanyao JiangAbstract:Abstract Single edge specimens made of 1070 steel were subjected to combined axial–torsion loading at room temperature. Three loading paths were designed to study the loading path influence on the Crack growth behavior. Path I was proportional loading and Path II was the loading case, where the torque decreased/increased with increasing/decreasing axial load. Path III followed a circular path in the axial load–torque coordinates. With identical load amplitudes, the Crack growth behavior was found to be critically dependent on the loading path. Path III resulted in the Fastest Crack growth rate and Path II produced the least Crack extension. Furthermore, the Crack profile was dependent on the loading path. Path III resulted in a Crack profile similar to that observed under Mode I loading. Significant branching and slant angles were observed for Paths I and II, with Path II in particular. Two existing models were discussed with respect to their capabilities to predict the Crack growth rate and Cracking direction for combined loading.