複合材料平板在插銷固定處之應力分析

The stress analysis of bolted joints in laminated plates

徐紹文(Hsu, Shao Wen)

指導教授 ： 蔣長榮

國立清華大學/工學院/動力機械工程學系/碩士(2016年)

摘要

本文旨在探討不同位置不同數量插銷固定住的二維複合材料平板，在一側施加拉伸均布負載，以有限元素法研究在不同疊序之疊層板以及纖維走向0∘之單層板上施加拉伸負載大小為10MPa，考慮插銷與平板接觸邊緣有無發生摩擦、有無間隙之狀況下，在插銷與平板接觸區域之應力分布情形及利用Tsai & Wu破壞準則判斷破壞模式及發生位置，並藉由有限元素套裝軟體「ANSYS」來進行本文的模擬與分析。
　　以碳纖維/環氧樹酯(AS/3501 carbon/epoxy)複合材料為平板，低碳鋼(A36-steel)為插銷，透過模擬觀察出若接觸區域含有間隙將導致接觸應力分布幅度縮小，且接觸應力值也將變大。而若接觸區域發生摩擦則會使接觸應力分布幅度稍稍增加，也將能使得接觸應力值降低。透過不同疊層之方式模擬可知，Cross-ply[0/90]2s此種疊序之疊層板在受力後其將最不容易產生破壞，故其最適合拿來做為插銷固定之平板材料。而在二顆及三顆插銷固定之模型上，透過增加插銷彼此間距的方式，也能將接觸應力值稍稍降低，一併能降低其Tsai & Wu判別式值。

關鍵字

插銷 ； 複合材料疊層板 ； 破壞分析 ； 接觸應力 ； 有限元素法

並列摘要

The thesis discusses 2D laminated plates bonded by bolt. The plates are subjected to the uniformly distributed load 10MPa at far field. A variety of laminates are considered, including Lamina(0∘), Cross-ply[0/90]2s, and Quasi-isotropic[0/+45/90/-45]s. Not only is the influence of the friction between bolt and the plate taken into account, but also the gap between them is considered. The stress distribution between bolts and laminates are calculated, and the failure mode and failure location are determined by Tsai-Wu failure criterion. The simulations have been done by using ANSYS.
　　The plate is composed of AS/3501 carbon/epoxy, and the bolt is made up of A36-steel. From the results of the simulations, we have found the contact region with gap will lead to reduction of the stress distribution range, and the increase of the contact stress. If there is friction between the contact region, the stress distribution range will increase slightly, and it will also reduce the contact stress. Through different simulations, we have found that Cross-ply[0/90]2s is the strongest laminate. In other words, the laminates type of Cross-ply[0/90]2s is the most suitable as a plates with bolted joints. On the models bonded by two or three bolts, if we increase the distance of the bolts, the contact stress will decrease slightly, and so is the value of Tsai-Wu discriminant.

並列關鍵字

Bolted Joint ； Composite Laminates ； Failure Analysis ； Contact Stress ； Finite Element Method

參考文獻

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