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Dynamic analysis of one-point bend impact test

机译:单点弯曲冲击试验的动态分析

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摘要

A simple 3-degrees of freedom (dof) model of the one-point test is developed using assumed mode method. The mode shape functions and the frequency equations of the cracked beam are derived from Timoshenko beam equations by treating the crack as a discontinuity in the moment of inertia. The 3-dof model is used to predict impact force and stress intensity factor based on the initial impact velocity of the falling mass. The model is validated by simulating the experiment reported elsewhere in the literature. The analytical results match well with the experimental data demonstrating the accuracy of eigenvalue analysis, and the adequacy of the 3-dof model for the analysis of the one-point bend test.
机译:使用假定模式方法开发了一个简单的单点测试的3自由度(dof)模型。通过将裂纹视为惯性矩中的不连续点,从Timoshenko光束方程式导出了裂纹光束的振型函数和频率方程。 3-dof模型用于基于下落物体的初始撞击速度来预测撞击力和应力强度因子。通过模拟文献中其他地方报告的实验来验证该模型。分析结果与表明特征值分析的准确性的实验数据非常吻合,并且3-dof模型足以进行单点弯曲测试分析。

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