S-2/F46复合材料低速冲击损伤及剩余弯曲性能

Damage and Residual Flexural Properties of S-2/F46 Composites Under Low Velocity Impact

考察了单向、正交和准各向同性S-2/F46复合材料低速冲击后的剩余弯曲强度和模量,结合冲击损伤形貌比较了其冲击损伤模式及演化过程。单向复合材料的冲击损伤呈突变式发展,而正交和准各向同性复合材料则呈多阶段渐进式发展,弯曲性能衰减也呈现相应模式。只有当试样的结构完整性损失较大时弯曲性能才明显下降,其衰减的临界冲击能以单向复合材料最大,正交复合材料最小。此外,角铺层复合材料弯曲模量比强度衰减更严重。

The residual flexural strength and modulus of unidirectional, cross-ply and quasi-isotropy S- 2/F46 composites were investigated after the low velocity impact with different energies. The differences in damage modes and evolutions were analyzed combined with the damage morphology. The unidirectional composites show a mutation mode for the damage evolution or the reduction in flexural properties, while the cross-ply or quasi-isotropy composites show a multistage progressive mode. The flexural properties clearly degrade only when the structural integrity of composites is considerably damaged. The critical impact energy to initiate reduction in flexural property of unidirectional composites is the largest and that of cross-ply composites is the smallest. In addition, for angle-laminated composites, the reduction in flexural modulus is more significant than that in flexural strength.