Ti-C纤维金属层压板自由振动试验和数值分析

发布时间：2019-06-22 09:22

【摘要】：为研究由钛合金和碳纤维增强复合材料交替铺设而成的Ti-C纤维金属层压板(FMLs)的制备及自由振动,首先,使用有限元分析软件MSC.PATRAN/NASTRAN对不同尺寸Ti-C FMLs的自由振动进行了二维有限元建模计算,确定了尺寸效应对FMLs固有频率的影响;然后,采用电磁激振器和非接触式激光扫描仪进行自由振动试验,比较了数值仿真结果和试验结果;最后,计算了相同尺寸的纯碳纤维复合材料层压板和不同钛合金层压板层数的Ti-C FMLs的固有频率,研究了钛合金层压板层数对FMLs固有频率的影响。结果显示:试件的尺寸越小,固有频率的计算误差越大,即当结构面内尺寸相对于厚度的倍数较小时,模型的计算误差大;数值仿真结果和试验结果总体吻合较好,有限元模型有效;FMLs的固有频率随着钛合金层压板层数的增加而减少。所得结论可为提高Ti-C FMLs自由振动的可设计性提供参考。
[Abstract]:In order to study the preparation and free vibration of Ti-C fiber metal laminates made of titanium alloy and carbon fiber reinforced composites, firstly, the two-dimensional finite element modeling calculation of the free vibration of Ti-C FMLs with different sizes was carried out by using the finite element analysis software MSC.PATRAN/NASTRAN, and the influence of size effect on the natural frequency of FMLs was determined. Then, the free vibration test was carried out by electromagnetic exciter and contactless laser scanner, and the numerical simulation results and test results were compared. finally, the natural frequencies of Ti-C FMLs with the same size of pure carbon fiber composite laminate and different number of titanium alloy laminates were calculated, and the effect of the lamination number of titanium alloy laminate on the natural frequency of FMLs was studied. The results show that the smaller the size of the specimen is, the greater the calculation error of natural frequency is, that is, when the in-plane size of the structure is smaller than the multiple of thickness, the calculation error of the model is large, the numerical simulation results are in good agreement with the experimental results, the finite element model is effective, and the natural frequency of FMLs decreases with the increase of the number of titanium alloy laminates. The conclusion can be used as a reference for improving the design of free vibration of Ti-C FMLs.
【作者单位】： 上海交通大学航空航天学院;纤科先进复合材料公司;
【基金】：航空科学基金(2015ZA57002)
【分类号】：TB333
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本文编号：2504448