Effects of NonGlide Stresses on Plastic Flow arising 非滑动应力对塑性流动产生的影响.pptVIP

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Effects of NonGlide Stresses on Plastic Flow arising 非滑动应力对塑性流动产生的影响.ppt

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Effects of Non-Glide Stresseson Plastic Flow and Failure Mechanismsarising from Non-Planar Dislocation Core Structures:Multiscale Simulations of Non-Associated Flow CONCLUSIONS From the multiscale simulations beginning with the input from atomistics we observe that the non-glide stresses have similar order-of-magnitude effects at single and polycrystal levels and generally on macroscopic response. Since these effects have their origin in dislocation core transformations, they arise generally at high stress levels, particularly at high strain-rates and/or low temperatures. There are comparable order-of-magnitude effects on strain localization in the form of bifurcations, sheet necking, and on cavitation instabilities to name a few. In the language of continuum plasticity, at each scale a significant effect of non-associated flow behavior is present. * J. L. Bassani and V. Racherla Mechanical Engineering and Applied Mechanics V. Vitek and R. Groger Materials Science and Engineering University of Pennsylvania Support: NSF/ITR DMR-0219243 Mechanics of Materials June 2004 Single Crystal Dislocation Dynamics Crystal Plasticity Polycrystals Homogenization Finite Elements identification of slip planes non-glide stress components multi-slip models Dislocation Core Atomistics - MD Component Response Macroscopic Simulations effective macroscopic behavior Multiscale Simulations of Non-Associated Plastic Flow Atomistic studies of defect structures are the basis of models at progressively higher length-scales which ultimately are used to study macroscopic response and, in particular, failure mechanisms. Our strategy is to pass only the most essential information on to higher length scales. Using accurate potentials to describe the atomic interactions of BCC metals and intermetallic compounds we have: studied the influence of the stress state, on the motion of a screw dislocation from atomistic simulations developed yield criteria for dislocation motion – effects o