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首页> 外文会议>IUTAM Symposium on Computational Mechanics of Solid Materials at Large Strains Aug 20-24, 2001 Stuttgart, Germany >Physically-Based Single and Polycrystal Plasticity Models and their Experimental Verification
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Physically-Based Single and Polycrystal Plasticity Models and their Experimental Verification

机译：基于物理的单晶和多晶塑性模型及其实验验证

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摘要

Physically-based constitutive relations for single crystals are formulated on the basis of slip-induced plastic deformation, and the accompanying elastic lattice distortion. The slip is produced through the motion of dislocations. Due account is taken of the crystal structure and the barriers which the dislocations must overcome in their motion through the lattice. A slip model that directly accounts for both the temperature- and strain-rate effects, is presented. The short- and long-range barriers that the dislocations must overcome in their motion are identified. The hardening issue, associated with the long-range athermal resistance to the motion of the dislocations, is examined. Illustrative physically-based models of the flow stress associated with slip, are developed. Explicit results for bcc and fcc crystals are produced, taking into account the temperature, strain rate, and the long-range hardening effects. As an illustration, explicit results for a commercially pure tantalum (bcc), and OFHC copper (fcc), are given. Using the results of novel experiments, performed to obtain the isothermal and adiabatic stress-strain relations of a number of polycrystalline metals over broad ranges of the strain-rates and temperatures, the resulting constitutive relations are verified. The references listed at the end of this paper provide the necessary background data for the modeling and the corresponding experimental assessment.
机译：基于滑移引起的塑性变形以及伴随的弹性晶格畸变，可以制定基于单晶的物理本构关系。滑移是通过位错运动产生的。应适当考虑晶体结构和位错在通过晶格运动中必须克服的障碍。提出了直接考虑温度和应变率影响的滑移模型。确定了位错在运动中必须克服的短程和长程障碍。研究了与位错运动的长期无热阻力相关的硬化问题。建立了与滑移相关的流动应力的基于物理的说明性模型。考虑到温度，应变速率和远距离硬化效果，会产生bcc和fcc晶体的明确结果。作为说明，给出了商业纯钽（bcc）和OFHC铜（fcc）的明确结果。利用新颖的实验结果，获得了多种多晶金属在较宽的应变率和温度范围内的等温和绝热应力-应变关系，从而验证了所得的本构关系。本文末尾列出的参考资料为建模和相应的实验评估提供了必要的背景数据。

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