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中文摘要：
采用拉格朗日实验分析技术对1～3μm，10～15μm和30～40μm三种不同晶粒度细化钨合金材料91W-6．3Ni-2．7Fe在高应变率下的动态力学性能进行研究。得到三种不同晶粒度的钨合金在不同冲击速度下各拉氏位置的应力时程曲线。利用拉氏分析方法对钨合金在高应变率下的力学性质进行探讨，分析各拉氏位置的应变，比容，密度，应变率，比内能，质点速度等物理量的变化历史，讨论不同晶粒度尺寸对钨合金在高应变率下动态力学性能的影响，给出钨合金在应变率为10^4～10^5S^-1时的应力应变曲线。
英文摘要：
Experimental Lagrangian analysis technique was adopted to investigate the dynamic behavior of 91W-6.3Ni-2.7Fe with three kinds grain sizes of 1-3μm, 10-15μm and 30-40μm. The stress-time history curves at different Lagrangian positions were obtained for tungsten alloys at different impact velocities. Lagrangian analysis technique was used to discuss the mechanical properties of the tungsten alloys under high strain rate. The mechanical quantities at different Lagrangian positions, such as strain, specific volume, density, strain rate, specific internal energy and particle velocity were obtained. The influence of grain size on the dynamic behavior of tungsten alloys under high strain rate was analyzed and the stress-strain curves （10^4-10^5s^-1） of the tungsten alloys were given.
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