• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Engineering and Performance >Thermomechanical Modeling of Stress Relaxation in Shape Memory Alloy Wires
【24h】

Thermomechanical Modeling of Stress Relaxation in Shape Memory Alloy Wires

机译：形状记忆合金丝应力松弛的热力学建模

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

When a shape memory alloy (SMA) is subjected to a mechanical load, especially at high strain rates, its temperature varies due to thermomechanical coupling in the response of these materials. Thus, if strain is kept constant during the transformation, temperature change will cause stress to decrease during loading and to increase during unloading. A decrease in stress under constant strain indicates stress relaxation, and an increase in stress indicates stress recovery, i.e., reverse stress relaxation. In this paper, a fully coupled thermomechanical model is developed in a continuum framework to study stress relaxation and stress recovery in SMA wires. Numerical simulations at different ambient temperatures, applied strain rates, wire radii, and relaxation intervals are done to show the abilities of the proposed model in predicting relaxation phenomena in various conditions where strain remains constant during loading or unloading. Relaxation experiments were also performed on NiTi wires, and the numerical and empirical results are shown to be in a good agreement.
机译：当形状记忆合金（SMA）承受机械载荷时，尤其是在高应变速率下，其温度会由于这些材料的响应而发生热机械耦合而发生变化。因此，如果在转变过程中应变保持恒定，则温度变化将导致应力在加载过程中减小而在卸载过程中增大。恒定应变下的应力减小表示应力松弛，而应力的增大表示应力恢复，即反向应力松弛。在本文中，在连续框架中建立了一个完全耦合的热力学模型，以研究SMA线材中的应力松弛和应力恢复。在不同的环境温度，施加的应变速率，线半径和松弛间隔下进行了数值模拟，以显示所提出的模型在各种条件下预测松弛现象的能力，这些条件在加载或卸载过程中应变保持恒定。还对镍钛丝进行了弛豫实验，数值和实验结果表明吻合良好。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号