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首页> 外文期刊>Applied Mechanics and Engineering >POSTBUCKLING CHARACTERISTICS OF THE SHORT SUPERELASTIC SHAPE MEMORY ALLOY COLUMNS- EXPERIMENT AND QUANTITATIVE ANALYSIS
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POSTBUCKLING CHARACTERISTICS OF THE SHORT SUPERELASTIC SHAPE MEMORY ALLOY COLUMNS- EXPERIMENT AND QUANTITATIVE ANALYSIS

机译：短超弹性形状记忆合金柱的后屈曲特性-实验与定量分析

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摘要

A few unique buckling and postbuckling characteristics of short superelastic shape memory alloy (SMA) columns are observed experimentally and explained in terms of numerical simulation. Interestingly, it is found from the load-deformation curves that during compression the SMA column with slenderness ratio (L/k) of 38 exhibits two distinct buckling loads, the other one being higher, completely contrary to the general notion that load falls off monotonously for all columns in the postbuckling region. Similarly, for L/k of 28, the SMA column can sustain a significantly high load after a distinct change in the mode of deformation. Based on the large deformation theory as well as the nonlinear stress-strain relations, the load-deformation curves of the short SMA columns have been predicted by using the FEM code ANSYS. Precise and quantitative analyses of these results verify the fact that the SMA column's behavior can be attributed to the special nature of the stress-strain curves.
机译：实验观察到短超弹性形状记忆合金（SMA）柱的一些独特的屈曲和后屈曲特性，并通过数值模拟对其进行了解释。有趣的是，从载荷-变形曲线发现，在压缩过程中，细长比（L / k）为38的SMA柱表现出两个不同的屈曲载荷，另一个更高，完全与载荷单调掉落的一般观点相反。后屈曲区域中的所有列。类似地，对于L / k为28的情况，SMA柱在变形模式发生明显变化后可以承受很高的载荷。基于大变形理论以及非线性应力-应变关系，使用有限元代码ANSYS预测了SMA短柱的荷载-变形曲线。对这些结果的精确和定量分析证实了以下事实：SMA柱的行为可以归因于应力应变曲线的特殊性质。

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