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应用有限元对液压鼓胀试验进行模拟,通过SUS304材质的试样位移-载荷曲线的模拟值与试验值对比,验证有限元模型参数的准确性。考虑上夹持器在螺栓夹紧的同时发生微弱拱起,定义其几何模型由一段斜线和圆弧组成,并进行论证。提出了一种结合液压鼓胀试验和有限元两方面确定微试样材料性能的方法。对316L材料进行线性强化弹塑性模型简化,通过有限元分析计算得到的位移-载荷曲线逐步逼近试验位移-载荷曲线,反推出屈服强度和线性强化弹塑性模型的最优参数,并将其与相同材质相同厚度的材料拉伸试验得出的材料属性进行对比。
The finite element method is used to simulate the hydraulic bulging test. The accuracy of the finite element model parameters is verified by comparing the simulated and measured values of the displacement-load curve of the SUS304 material. Considering that the upper retainer fits slightly at the same time as the bolt is clamped, its geometric model is defined by a series of diagonal lines and arcs, and is demonstrated. A method to determine the properties of micro-sample materials in combination with hydraulic bulging test and finite element method is proposed. The elastic-plastic model of 316L material is simplified linearly. The displacement-load curve calculated by finite element analysis is gradually approached to the test displacement-load curve. The optimal parameters of yield strength and linear elastic-plastic model are deduced and compared with the same The material properties of the same thickness of material tensile test were compared.