金属丝弹性模量的测量方法研究

Measurement Study for Elastic Modulus of Metal Wires

通过用纳米压入法和静态拉伸法对β-Ti丝、不锈钢丝以及3种NiTi丝进行弹性模量的测量。实验表明,纳米压入法弹性模量比静态拉伸法弹性模量大,并且材料的弹性模量越低,二者相差越大,其原因同试样的表面硬化层和尺寸效应有关。通过分析比较,建立了金属丝弹性模量的纳米压入法和静态拉伸法所得值之间的相关关系。

The elastic modulus of β-Ti wire, stainless steel wire and three kinds of NiTi wires were measured by nanoindentation method and static tension method. The results showed that the elastic modulus by nanoindentation method were lager than that by the static tension method; the lower elastic modulus of materials, the greater difference between these two methods. The reason for that might be attributed to the surface hardened layer and size effect of specimens. Through data analysis, an approximate relationship between elastic modulus of nanoindentation method and elastic modulus of static tension method was set up.