低速冲击复合材料层合板的机械修补参数研究

Mechanical repair parameters study on composite laminates with low velocity impact damage

对于铺层材料为T300/双马树脂的复合材料层合板,研究了低速冲击损伤条件下机械修补的影响因素。考虑机械修补填充效应和装配干涉量、螺栓预紧力、界面摩擦力对修补强度的影响,针对低速冲击复合材料层合板的机械修补,建立了三维的有限元模型,有限元计算结果与实验结果吻合良好,从而机械修补模型是有效的。进一步有限元计算分析表明:1)金属填充装配的干涉量存在最优值;2)摩擦系数的增大可有效地提高修补结构压缩破坏强度;3)较大模量比修补结构的强度较小;4)存在最优的螺栓拧紧力矩,在此拧紧力矩下修补件的修补强度最高。

composite board low-speed impact damage repair influencing factors with ply material as T300/bismaleimide resin was studied. With consideration on filling effect of mechanical repair, assembly interference amount, bolt pretension and interface friction force on repaired specimen strength, three dimension finite element model for mechanical repair on composite laminates with low velocity impact damage was constructed. Compared with experiment, it was found that finite element model agreed with experiment, thus validity of mechanical repair model was proved. Further finite element calculation and analysis showed, 1） there is an optimal value for the amount of interference of the metal filling assembly; 2） the increase of the friction coefficient can effectively improve the compression failure strength of the repaired structure; 3） larger modulus ratio is not conducive to the strength recovery of the repaired structure; 4） there is an optimal screw tightening torque, specimen has the highest repaired strength under thistightening torque.