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利用飞轮式Hopkinson拉杆实验技术对钨质量分数为 93%的钨合金在 - 5 0～ 10 0℃温度范围、应变率 ε =10 2 ～ 10 3 s-1区间的动态拉伸性态进行了测试 ,提供了相应的σ -ε曲线和最大拉伸失效应变 ,并以此为依据建立了该合金动态拉伸行为的本构关系 ,提出了该合金受动载发生塑性失稳以致发生拉断的判据。利用断口分形分析理论 ,对试件拉伸断口微观特征所作的分析和对宏观力学性态实验所作的结论给予了有力的支持
The dynamic tensile properties of the tungsten alloy with tungsten mass fraction of 93% at the temperature range of -50 ~ 100 ℃ and the strain rate of ε = 102 ~ 103 s-1 were studied by flywheel Hopkinson rod test The corresponding σ-ε curve and the maximum tensile failure strain are provided. Based on this, the constitutive relation of the dynamic tensile behavior of the alloy is established, and the plastic instability of the alloy subjected to dynamic loading is proposed. Criteria. Using fracture fractal theory, the analysis of the microscopic characteristics of the tensile fracture of the specimen and the conclusion of the experiment on macroscopic mechanical properties are given.