T700碳纤维增强复合材料螺栓连接的渐进损伤分析

为了研究及预测T 700碳/环氧复合材料螺栓连接的失效模式和失效载荷,建立基于蔡吴准则的T 700碳纤维复合材料45_3/90_3/-45_3/0_3]_s双搭接螺栓连接的渐进损伤模型;采用渐进损伤模型分析了不同孔端距/孔直径(E/D)值对螺栓连接失效载荷的影响。结果表明:复合材料中90°铺层损伤最为严重,±45°铺层相比90°铺层损伤较少,0°铺层损伤与其他铺层相比最低。当E/D≤3时,E/D的增加能显著提高失效载荷;当E/D3时,E/D的增加对失效载荷的提高不明显,表明整体预测误差在8%以内,可见该渐进损伤模型可以较好地预测螺栓连接的失效模式及失效载荷。

Progressive Damage Analysis of Bolted Joints for T700 Carbon Fiber Composite

To study and predict the failure mode and failure load of bolt joint for T700 carbon/epoxy composite, a progressive damage model of T700 carbon fiber composite 453/903/-453/03]s with double-lap bolt joint based on Tsai-Wu criterion was established in this paper. By studying damage patterns, it was found that 90 ° layer damage in composite laminate was most serious; damage in ±45 ° layer was less than 90 ° layer; 0 ° layer damage was the least compared with other layers. At the same time, progressive damage models were adopted in this paper to analyse the effect of different E/D on failure load of bolt joint. When the value of E/D was less than or equal to 3, it was found that the increase of E/D could significantly improve the failure load. While E/D was more than 3, the improvement of failure load was not obvious by increasing of E/D. The results show that the prediction error is within 8%, and the progressive damage model can well predict failure mode and failure load of bolt joint.