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进行了热态环境双向拉伸的各向异性金属板材复杂加载条件下力学性能试验。设计的针对两种不同厚度条件的热环境双向拉伸十字形试件能有效增加中心区的变形量,满足试验需求;试验环境可达800℃,可完成对碳钢等高结晶温度材料的试验;通过比例阀加载位移控制,可得到高温下完整的材料屈服轨迹;采用光学散斑方法测量应变,获得全场高精度应变数据,且该方法减少了工作量和试验成本。利用不同加载应变比条件下得到的应变和拉伸力,结合单位体积等塑性功原理得到材料在高温下等效应力-应变曲线,为研究热环境复杂载荷下材料力学性能提供了依据。
The mechanical properties of the anisotropic sheet metal under biaxial tension in hot environment were investigated under complex loading conditions. Designed for two different thickness conditions of the biaxial tensile thermal deformation test specimens can effectively increase the deformation of the central area to meet the test requirements; test environment up to 800 ℃, to complete the test of carbon steel with high crystallization temperature materials Through the displacement control of the proportional valve, the complete yield curve of the material can be obtained under high temperature. The optical speckle method is used to measure the strain to get the accurate data of the whole field, and the method reduces the workload and the test cost. The equivalent stress-strain curve of the material at high temperature is obtained by using the strain and tensile force obtained under different loading strain ratios and the plastic work principle such as unit volume, which provides a basis for studying the mechanical properties of the material under complex loading in thermal environment.