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Dynamic response of transparent ceramic MgAl_2O_4 spinel

机译：透明陶瓷MgAl_2O_4尖晶石的动态响应

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摘要

The quasistatic and dynamic compressive strengths of transparent spinel (MgAl_2O_4) specimens with grain sizes of 0.4 and 1.4 um are measured. The measured strengths and rate sensitivities of the spinel specimens are compared with another transparent ceramic material, AlON, with significantly coarser grains. The observed trends in rate sensitivities are consistent with micromechanical models that describe the dynamic failure of brittle solids under compression. Differences in observed crack speeds are also related to microstructural differences including grain size.
机译：测量了透明尖晶石（MgAl_2O_4）晶粒尺寸为0.4和1.4 um的准静态和动态抗压强度。将尖晶石样品的测得强度和速率敏感性与另一种明显粗糙的透明陶瓷材料AlON进行比较。观察到的速率敏感性趋势与描述压缩下脆性固体的动态破坏的微力学模型一致。观察到的裂纹速度差异还与包括晶粒尺寸在内的微观结构差异有关。

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