The Macro-mechanical Properties and Micro-mechanism of Rock-like Material by Varying Strain Rate
Date Issued
2014
Date
2014
Author(s)
Chen, Ta-Chun
Abstract
The influence of strain rate on mechanical behavior of rock is significant. The strain rate affects not only the strength of rock but also the failure modes. To understand the relationship of failure modes under different strain rates and micro-structure of rock, this study adopted rock-like material with different grain contents and performed a series of compression tests at different strain rates (static tests and spilt-Hopkinson pressure bar tests). The experimental results indicate that (1) The strength of matrix plays an important role on the strength of specimens with the same grain content. (2) For the specimens of 40% grain content, most failure modes are split failure, but for the specimens of 60% grain content, the shear failure occurs at low strain rate and the split failure could be observed at high strain rate. (3) When the trans-granular fracture percentage at high strain rate increases, the strength of specimen would increase.
Subjects
SHPB分離式霍普金森壓桿
高速攝影機
穿晶破壞
Type
thesis
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