高应变率下断裂韧性实验的数值模拟

发布时间：2018-05-17 21:38

本文选题：固体力学 + 断裂韧性　；参考：《爆炸与冲击》2016年03期

【摘要】：采用有限元软件ANSYS/LS-DYNA程序对静态和冲击荷载作用下的含裂纹半圆弯曲(SCB)实验进行了数值模拟。根据静态实验的模拟结果,提出了适合复合型加载的Ⅰ型应力强度因子拟合公式,采用该公式计算应力强度因子的最大误差不超过10%。动态实验的模拟结果表明:对于纯Ⅰ型加载的SCB实验,动态应力强度因子随着试样半径、支座间距以及相对裂纹长度的变化呈现规律性变化;当试样半径小于60mm、相对支座间距为1.2、相对裂纹长度在0.1~0.4范围内时,惯性效应的影响较小,采用静态拟合公式计算裂尖的动态应力强度因子的误差约10%;对于复合型加载的SCB实验,当相对裂纹长度为0.2~0.4、裂纹倾角在10°~40°范围内时,采用静态拟合公式计算裂尖的动态应力强度因子的误差小于10%。
[Abstract]:The finite element software ANSYS/LS-DYNA was used to simulate the experimental results under static and impact loads. Based on the simulation results of static experiments, a fitting formula of type I stress intensity factor is proposed, which is suitable for compound loading. The maximum error of calculating stress intensity factor is not more than 10. The simulation results show that the dynamic stress intensity factor changes regularly with the radius of the specimen, the distance between supports and the relative crack length for the pure mode I loaded SCB experiment. When the specimen radius is less than 60 mm, the relative support spacing is 1.2, and the relative crack length is in the range of 0.1 ~ 0.4, the influence of inertia effect is small. The error of calculating the dynamic stress intensity factor of crack tip by static fitting formula is about 10. For the SCB experiment of composite loading, When the relative crack length is 0.2g and the crack inclination is in the range of 10 掳to 40 掳, the error of calculating the dynamic stress intensity factor of the crack tip is less than 10 when the static fitting formula is used.
【作者单位】：合肥工业大学土木与水利工程学院;
【基金】：国家自然科学基金项目(11072072)
【分类号】：O346.1

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