Analysis of spherical indentation of superelastic shape memory alloys
Analysis of spherical indentation of superelastic shape memory alloys
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DOI：
10.1016/j.ijsolstr.2006.04.007
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发表时间：
2007
影响因子：
3.6
通讯作者：
Wenyi Yan;Q. Sun;Xi-Qiao Feng;L. Qian
中科院分区：
文献类型：
--
作者：
Wenyi Yan;Q. Sun;Xi-Qiao Feng;L. Qian
本文采用量纲分析和有限元方法研究了超弹性形状记忆合金的球形压痕。从量纲分析得出的比例关系桥梁压痕响应和超弹性形状记忆合金的力学性能。超弹性压痕曲线的几个关键变量的揭示和检查。证明了超弹性压痕曲线中的分叉力只依赖于正相变应力和初始奥氏体的弹性性质;超弹性压痕曲线中的回复力只依赖于逆相变应力和初始奥氏体的弹性性质。此外，证明了确定分叉力和回复力的无量纲函数是相同的。这些结果不仅加深了我们对超弹性形状记忆合金球形压痕的理解，而且为发展一种实用的方法来标定超弹性材料的球形压痕力学性能提供了理论基础。
Dimensional analysis and the finite element method are applied in this paper to study spherical indentation of superelastic shape memory alloys. The scaling relationships derived from dimensional analysis bridge the indentation response and the mechanical properties of a superelastic shape memory alloy. Several key variables of a superelastic indentation curve are revealed and examined. We prove that the bifurcation force in a superelastic indentation curve only relies on the forward transformation stress and the elastic properties of the initial austenite; and the return force in a superelastic indentation curve only relies on the reverse transformation stress and the elastic properties of the initial austenite. Furthermore, the dimensionless functions to determine the bifurcation force and the return force are proved to be identical. These results not only enhance our understanding of spherical indentation of superelastic shape memory alloys, but also provide the theoretical basis for developing a practicable method to calibrate the mechanical properties of a superelastic material from the spherical indentation test.