轻木夹层板可靠度分析的有限元模拟与试验
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摘要
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 ANSYS,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 panels. 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.
A method to study the reliability of balsa sandwich panel was presented. The mechanical properties of balsa sandwich panel were analyzed with ANSYS,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 panels. 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.
引文
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[2]羊妗.复合材料迭层板可靠性分析[J].西北工业大学学报,1987,5(3):317-325.
[3]李辉北.泡沫夹层板结构可靠性分析与实验验证方法[D]//长沙:国防科学技术大学.2011.
[4]李同林.应用弹塑性力学[M].武汉:中国地质大学出版社,2002.
[5]NILSON T M,RENAN A S.Analysis of failure criteria applied to wood[J].Engineering Failure Analysis,2013,35:703-712.
[6]武清玺.结构可靠性分析及随机有限元法[M].北京:机械工业出版社,2005.
[7]张明.结构可靠度分析—方法与程序[M].北京:科学出版社,2009.
[8]张伟.结构可靠性理论与运用[M].北京:科学出版社,2008.
[9]FROSTIG Y,THOMSEN O T.Localized effects in the non-linear behavior of sandwich panels with a transversely flexible core[J].Journal of sandwich structures and materials,2005,7(1):53-75.
[10]DAFEDAR J B,DESAI Y M.Thermomechanical buckling of laminated composite plates using mixed higher-order analytical formulation[J].Journal of Applied Mechanics,2002,69:790-799.
[11]熊铁华,常晓林.响应面法在结构体系可靠度分析中的应用[J].工程力学,2006,23(4):58-61.
[12]韦斌凝,彭修宁,朱清元,等.基于新样条基函数的弹塑性厚/薄板子域分析[J].广西大学学报(自然科学版),2011,36(4):542-546.
[13]徐佳.板弯曲问题随机分析与可靠度分析样条虚边界元法研究[D].广州:华南理工大学,2015.
[14]魏俊红,陈建桥,许玉荣.复合材料层合板的率模可靠度研究[J].固体力学学报,2005,26(3):297-302.