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小冲孔试验技术(SPT)是测量在役构件材料力学性能的新方法。文章介绍了基于弹性能量理论预测材料屈服强度的小冲孔能量法,并对试验原理及步骤进行了详细阐述。在验证试验重复性的基础上,对Q345R进行小冲孔能量法试验,并与常规拉伸试验、小冲孔偏移法和双斜率法的结果进行对比。结果表明,能量法测试Q345R屈服强度的误差为5.52%,远小于双斜率法和偏移法试验结果的误差。在此基础上,根据有限元模拟,结合载荷-位移(L-D)曲线与能量-位移(E-D)曲线,分析了试样厚度、压球直径、下模孔径、冲压速度以及试样边缘减薄等因素对小冲孔能量法结果的影响。得出试样厚度0.5mm、压球直径2.4mm、下模孔径4mm为最佳几何尺寸搭配。
Small Piercing Test Technology (SPT) is a new method to measure the mechanical properties of materials in service. In this paper, a small punching energy method based on the elastic energy theory to predict the yield strength of materials is introduced. The principle and procedure of the experiment are described in detail. Based on the verification of repeatability, Q345R was tested by small hole energy method and compared with the results of conventional tensile test, small hole offset method and double slope method. The results show that the error of Q345R yield strength measured by the energy method is 5.52%, which is much smaller than that of the double slope method and the offset method. On this basis, the thickness of the sample, the diameter of the ball, the diameter of the die, the punching speed and the thinning of the edge of the sample are analyzed based on the finite element simulation and the load-displacement (LD) curve and the energy-displacement curve Influence of Factors on the Results of Small Punching Energy Method. Draw a sample thickness of 0.5mm, pressure ball diameter of 2.4mm, 4mm lower die aperture for the best geometry with.