基于能量中值等效原理的液压鼓胀毫微测试技术研究

目的 基于液压鼓胀毫微测试技术获取材料单轴拉伸力学性能参数.方法 借助能量中值等效原理和有限元辅助测试方法,提出了获取材料单轴拉伸力学性能的液压鼓胀毫微测试理论.结合小圆片试样液压鼓胀试验,获取了压水反应堆机组蒸汽发生器接管材料20MND5的屈服应力和应变强化指数.将其输入有限元,进而模拟小圆片试样液压鼓胀加载的全过程...

Research on Nano Measurement Technology of Hydraulic Bulging Based on Mean-Value Energy Equivalence

The uniaxial tensile mechanical properties of materials were obtained based on the hydraulic bulging test technology. In this paper, based on mean-value energy equivalence and finite element aided testing method, a hydraulic bulging test technology is proposed to obtain the mechanical properties of materials under uniaxial tension. The yield stress and strain strengthening index of 20MnD5 pipe material in the Steam Generator (SG) was obtained based on the hydraulic bulging test of small wafer samples. It is input into the finite element to simulate the whole process of hydraulic bulging loading of small wafer sample. The pressure - displacement curve of hydraulic bulging obtained by finite element analysis is basically consistent with the pressure - displacement curve obtained by test. Based on the energy equivalence theory, the hydraulic bulging nanotechnology can obtain the mechanical property parameters of materials in uniaxial tension without a lot of tests, and the test method and principle are relatively simple, which is very convenient for engineering application.