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多钉连接钉载分配特性研究方法

, PP. 210-217

Keywords: 多钉连接件,钉载分配,试验,数值分析,复合材料层合板

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Abstract:

利用金属-复合材料层合板紧固件多钉连接件开展拉伸载荷下钉载分配特性的试验和有限元分析研究。试验件为一列三钉单搭接和双搭接连接件。通过应变电测技术获得连接件典型截面应变分布,再间接估算钉载分配比例。建立了试验件二维、三维有限元模型,并计算获得应变和钉载分配结果。对比发现,应变的计算值与实测值吻合,但钉载分配的计算结果与实测结果存在较大偏差。分析表明:基于表面应变测量估计钉载分配的方法不能反映连接件的附加弯矩对多钉钉载分配比例的影响;采用经过应变测量结果验证的有限元模型,通过数值计算确定钉载分配是一种可行的技术途径;而应用简化的板-梁二维有限元模型计算钉载分配可以满足工程精度要求。

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