缝合复合材料II型层间断裂特性研究

INVESTIGATION INTO THE EFFECT OF STITCHING IN CFRP ON MODE II DELAMINATION TOUGHNESS

分别采用测量 ENF试样加载点位移与测量其端部剪切位移 CSD(Crack Shear Displacement)的试验方法 ,研究了缝合复合材料层合板的 II型层间断裂韧性以及缝合密度 ,缝合线的直径等缝合参数对于缝合复合材料层合板 II型层间断裂韧性和分层模式的影响。结果表明 ,缝合降低了层合板初始分层韧性 GIIi,但对于分层的扩展有良好的抑制作用。

Effects of through thickness stitching on Mode II interlaminar fracture toughness( G II ) and modes of delamination of composite laminates were investigated by performing end notched flexure(ENF) tests. Vertical displacement of loading point and crack shear displacement(CSD) between upper and lower crack surfaces at the end of ENF specimens were measured. Different stitch yarns and stitch densities were considered. The addition of stitching was found to decrease the initiation interlaminar fracture toughness G IIi , but can effectively suppress the growth of delamination.