利用CSS4410型电子万能材料试验机和Hopkinson拉杆研究这两种材料在室温下应变率范围在0.001～3 300 s~(-1)的拉伸力学性能.结果表明:两种材料在不同应变率拉伸载荷下均有明显的应变硬化和颈缩现象;两种材料均表现出较强的应变率敏感性,并且材料Ⅰ的应变率敏感性强于材料Ⅱ.最后利用扫描电镜(SEM)对两种材料应变率在0.001s~(-1)和3300 s~(-1)下的拉伸断口进行观察,发现试样的断口形貌均为杯锥状,剪切唇区的面积比例随应变率的提高而增大,表现出一定的应变率相关性.
This paper employs the CS4410 mechanical test machine and Hopkinson tensile bar to carry out the tensile test with the strain rate ranging from 0.001 s~(-1) to 3300 s~(-1). Results show that there are evident strain hardening and necking phenomena for both materials at different strain rates;both materials all exhibit comparable strain rate sensitivity and the material Ⅰ is more sensitive than the material Ⅱ. In the end, tension fracture surface of strain rate 0.001 s~(-1) and 3 300 s~(-1) is studied by using the SEM,and observations of the cup and cone fracture surface reveal that shear zone area ratio increases with the strain rate.
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