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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。
Experimental and Finite Element Analysis of Sticking Load Distribution under Tensile Loading by Using Metal - Laminates Composite Fastener Rails. The test piece is a three-row single lap and double lap joint. The strain distribution of the typical cross-section of the connector is obtained through the strain gauging technique, and then the proportion of the stubs is estimated indirectly. The two-dimensional and three-dimensional finite element model of the test piece was established, and the strain and nail load distribution were calculated. The calculated results show that the calculated values of the strain agree well with the measured values, but there is a big deviation between the calculated results and the measured results. The analysis shows that the method based on the surface strain measurement to estimate the load distribution can not reflect the influence of the additional bending moment of the connector on the load distribution ratio. The finite element model validated by the strain measurement is used to determine the load distribution A viable technical approach. However, the application of simplified two-dimensional finite element model of plate-beam to calculate the load distribution can meet the requirements of engineering accuracy.