Free vibration characteristic of plain woven fabric laminates with multiple delaminations around a central hole
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摘要: 研究了含穿孔-多分层损伤平面编织层合板的自振特性问题。首先建立含椭圆穿孔2椭圆多分层损伤平面编织层合板自由振动分析有限元模型。然后通过典型算例,分别讨论了穿孔尺寸、分层尺寸以及穿孔-多分层损伤位置对平面编织层合板固有频率的影响。结果表明:当穿孔和分层的尺寸较小时,其对层合板固有频率的影响很小;横向穿孔-多分层损伤对层合板固有频率的影响较纵向穿孔-多分层损伤更显著;平面编织层合板固有频率对损伤位置最为敏感,分层尺寸次之,穿孔尺寸的影响最弱。Abstract: The free vibration characteristic was studied for plain woven fabric laminates with multiple delaminations around a central hole. Finite elements analysis models were established by MSC. Nastran/Patran for plain woven fabric laminates with elliptical multiple delaminations around an elliptical central hole. From some typical examples,the effects of the holes' size,multiple delaminations' size and damage's location on the vibration characteristic were discussed. The results show that the effect of small-sized hole and delaminations is not great. On the natural frequencies,the effect of transverse elliptical multiple delaminations around an elliptical central hole is more serious than that of lengthways elliptical multiple delaminations around an elliptical central hole;the natural frequencies are very sensitive to damages location,and less sensitive to multiple delaminations' size and the holes' size.
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