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首页> 外文会议>Asia-Pacific Conference on Shock amp; Impact Loads on Structures; 20031112-14; Changsha, Hunan,(CN) >EXPERIMENTAL STUDY ON DYNAMIC MECHANICAL PROPERTIES OF AL_2O_3 CERAMICS AND THE ESTABLISHMENT OF A DYNAMIC CONSTITUTIVE EQUATION
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EXPERIMENTAL STUDY ON DYNAMIC MECHANICAL PROPERTIES OF AL_2O_3 CERAMICS AND THE ESTABLISHMENT OF A DYNAMIC CONSTITUTIVE EQUATION

机译：AL_2O_3陶瓷动态力学性能的实验研究及建立本构方程的实验研究。

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摘要

The dynamic mechanical properties of Al_2O_3 ceramics are investigated using the classical and improved technique of Split Hopkinson Pressure Bar. It is shown that ceramic is nonlinear elastic-brittle material. This material is insensitive to strain-rate at lower strain-rate but sensitive at higher strain-rate . The dynamic modulus of elasticity and dynamic compressive strength of ceramic increase with increase in strain rate. Based on the theory of damage mechanics, a uniaxial nonlinear elastic-brittle damage-modified constitutive model is given. The parameters are obtained by fitting the SHPB test data. A strain-rate dependent damage-modified nonlinear elastic constitutive equation of Al_2O_3 ceramics is obtained.
机译：利用分裂霍普金森压力棒的经典和改进技术研究了Al_2O_3陶瓷的动态力学性能。结果表明，陶瓷是非线性弹性脆性材料。这种材料在较低的应变速率下对应变速率不敏感，但在较高的应变速率下敏感。陶瓷的动态弹性模量和动态抗压强度随着应变率的增加而增加。基于损伤力学理论，给出了单轴非线性弹塑性损伤修正修正本构模型。通过拟合SHPB测试数据获得参数。得到了应变速率相关的Al_2O_3陶瓷损伤修正非线性弹性本构方程。

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