分层缺陷对CFRP层合板力学性能的影响

Effect of delamination defects on mechanical properties of CFRP laminates

碳纤维增强树脂基复合材料(CFRP)具备高强度和高刚度,被广泛应用于航空航天和汽车等领域,然而碳纤维的分层缺陷会极大影响其力学性能。因此,研究分层缺陷对CFRP层合板拉伸、压缩、剪切和弯曲等力学性能的影响具有重大意义。采用复合成型工艺,将聚四氟乙烯片添加到复合材料中,经成型加工制备具有分层缺陷的CFRP层合板,考察了分层区域的尺寸和形貌,研究了分层缺陷对CFRP层合板力学性能的影响。研究发现,分层缺陷能显著降低CFRP层合板的压缩、剪切和弯曲强度,而且分层区域面积越大,CFRP层合板压缩和弯曲强度越小,但是分层区域面积的变化对拉伸强度影响较小。

Carbon fiber resin-based materials possess high strength and stiffness and are widely used in aerospace and automotive applications.However,delamination defects in carbon fibers can greatly affect the mechanical properties of the materials.Therefore,it is of great engineering significance to study the effect of delamination defects on the mechanical properties of carbon fiber resin matrix composite(CFRP)laminates such as tensile,compressive,shear and flexural properties.Using a composite molding process,polytetrafluoroethylene sheets were added to the composite material,and CFRP laminates with delamination defects were prepared by molding process,and the dimensions and morphology of the delamination region were examined to investigate the effects of delamination defects on the mechanical properties of CFRP laminates.It is found that the delamination defects can significantly reduce the compressive,shear and flexural strengths of CFRP laminates,and the larger the area of the delamination region,the smaller the compressive and flexural strengths of CFRP laminates,but the change of the area of the delamination region has less effect on the tensile strength.