Triple correlation for detection of damage-related nonlinearities in composite structures
Triple correlation for detection of damage-related nonlinearities in composite structures
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DOI：
10.1007/s11071-015-2004-6
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发表时间：
2015-03
影响因子：
5.6
通讯作者：
A. Klepka;M. Strączkiewicz;L. Pieczonka;W. Staszewski;L. Gelman;F. Aymerich;T. Uhl
中科院分区：
文献类型：
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作者：
A. Klepka;M. Strączkiewicz;L. Pieczonka;W. Staszewski;L. Gelman;F. Aymerich;T. Uhl
研究了未损坏复合板和分层复合板振动响应的非线性效应。分析的重点是各种激励幅度水平的振动响应中高次谐波的产生。使用三重相关技术研究了这种效应。使用二维有限元和经典层合理论对复合板的动力学进行建模。双节点方法用于模拟分层区域。振型和固有频率是根据数值模型估计的。接下来，使用分层散度分析来获得分层层的相对位移。进行了实验模态分析测试来验证数值模型。选择层间最强的两种振动模态以及脱层层运动水平最小和最大的两种振动模态进行非线性振动试验。采用费舍尔准则来验证所提出技术的有效性和置信度。结果表明，该方法不仅可以用来揭示非线性，还可以可靠地检测复合材料中的冲击损伤。这些结果通过统计分析得到证实。
Nonlinear effects in vibration responses are investigated for the undamaged composite plate and the composite plate with a delamination. The analysis is focused on higher harmonic generation in vibration responses for various excitation amplitude levels. This effect is investigated using the triple correlation technique. The dynamics of composite plate was modelled using two-dimensional finite elements and the classical lamination theory. The doubled-node approach was used to model delamination area. Mode shapes and natural frequencies were estimated based on numerical models. Next, the delamination divergence analysis was used to obtain relative displacements for delaminated plies. Experimental modal analysis test was carried out to verify the numerical models. The two strongest vibration modes as well as two vibration modes with the smallest and largest motion level of delaminated plies were selected for nonlinear vibration test. The Fisher criterion was employed to verify the effectiveness and confidence level of the proposed technique. The results show that the method can be used not only to reveal nonlinearities, but also to reliably detect impact damage in composites. These results are confirmed using the statistical analysis.