Stress Transmission of Materials with Different Strengths under Non-Hydrostatic Compression
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摘要: 运用金刚石压砧(DAC)同步辐射角散X射线衍射技术,对非静水压缩下不同强度材料的应力传递特性进行了高压原位研究。分别将Pt与-SiC、Pt与WC以及WC与-SiC压至56、61和25 GPa,实验发现,由于两种不同材料的屈服强度存在差异,其晶粒边界的应力传递是不连续的,同时观测到两种材料之间的应力差随强度差的增加而增加。在DAC轴向X射线衍射实验中,相同加载下,从接近最小应力的方向观测到,强度大的材料其应力较小。Abstract: Using diamond anvil cell (DAC) combined with synchrotron axial X-ray diffraction (AXRD) techniques, the stress transmission behavior among materials with different strengths was investigated under non-hydrostatic compression. In our experiments, powder mixtures of platinum (Pt) and cubic silicon carbide (-SiC), Pt and tungsten carbide (WC), as well as WC and -SiC, were compressed up to 56, 61, and 25 GPa, respectively. We found that the stress transmission among the grain boundary of two different materials is discontinuous due to their strength difference, and the observed stress difference increases with the strength difference. The stronger material has a smaller observed stress near the minimum stress direction under non-hydrostatic compression in DAC at the same loading.
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Key words:
- stress transmission /
- strength /
- non-hydrostatic compression
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