轻木夹层板可靠度分析的有限元模拟与试验

Experiment and finite element analysis on reliability of balsa sandwich panels

为进一步研究轻木夹层板的可靠性,提出了一种研究轻木夹层板可靠性的分析方法。首先采用ANSYS分析轻木夹层板的受力特性,并根据所建立的三种轻木夹层板失效准则分别计算其对应的可靠度,然后对轻木夹层板进行加载破坏试验并计算可靠度,最后对比有限元模拟和试验数据。结果表明:随机有限元法和试验得到的结果相差5.76%,在误差允许范围内,两者比较吻合,说明随机有限元法在分析轻木夹层板的可靠度方面是可行有效的,并且比加载试验具有更高的安全系数;另外,粘胶脱胶是大多数轻木夹层板破坏的直接原因。

A method to study the reliability of balsa sandwich panel was presented. The mechanical properties of balsa sandwich panel were analyzed with A N SY S ,and the reliability of three kinds of balsa sandwich panels were calculated based on the established failure criteria. The reliability was obtained from a damage experiment which was conducted on balsa sandwich pan els. The comparison between the finite element analysis and the experiment results was carried out. Results show that the difference between the results from the stochastic finite element analysis and those from the experiment is below 5. 76% , which is allowable; that the stochastic finite element method is effective in the analysis of the reliability of balsa sandwich panel ,and it has higher safety coefficient than the damage experiment. And viscose degumming is the immediate cause of the failure of most balsa sandwich panels