碳纤维复合材料箱形梁的初始破坏载荷研究

结合复合材料经典层合板理论和折板理论建立一种适用于碳纤维复合材料箱形梁初始破坏载荷的理论计算方法。应用该方法分别对0_4/±45/0_4]、0_2/±45/0_2/±45/0_2]和±45/0_2/±45/0_2/±45]三种铺层方案的箱形梁进行初始破坏载荷计算,得出其初始破坏载荷值。同时使用DNS100电子万能试验机对复合材料箱形梁三种铺层方案的试件进行三点弯曲实验。比较复合材料箱形梁初始破坏载荷的理论计算值与实验值,三种铺层方案的箱形梁理论计算误差小于4%。研究结果表明:本文建立的复合材料箱形梁初始破坏载荷的理论计算方法是正确的;复合材料箱形梁的0°铺层比例越高,箱形梁的初始破坏载荷越高。

RESEARCH ON THE INITIAL FAILURE LOAD OF COMPOSITE FIBER REINFORCED PLASTIC BOX GIRDER

A theoretical calculation method for the initial failure load of CFRP box girder is established by combining the classical laminated plate theory and the folding plate theory.The initial failure load of the box girder of 04/±45/04],02/±45/02/±45/02] and ±45/02/-±45/02/±45] is calculated by this method.At the same time,the three-point bending experiment is carried out on the CFRP box girder by using DNS100 electronic universal testing machine.The theoretical calculation value of the initial failure load of the composite box girder is compared with the experimental value.The theoretical calculation error is less than 4％.The results show that the theoretical calculation method of the initial failure load of the composite box girder is correct and the higher the 0° ply ratio,the initial failure load of composite box girder is higher.