摘要
利用分离式霍普金森压杆(SHPB)装置对双轴向经编针织(BWK)复合材料在面外、面内共三个方向进行了高应变率压缩试验,并在MTS材料试验机上进行了准静态压缩试验。计算并提取各应变率下的应力-应变曲线,观察各应变率下材料的破坏形态特征。结果表明,双轴向经编针织(BWK)复合材料具有应变率敏感性和各向异性,在面外压缩中其破坏形态主要是剪切破坏,在面内压缩中准静态下为剪切破坏,在高应变率下为分层破坏。
In this paper, compressive behaviors of bi-axial warp-knitted （BWK） composite under impact loading at various strain rates were investigated. The stress vs. strain curves and the relevant failure modes with different compressive loading strain rates in three orthogonal directions were obtained from the test system of Split Hopkinson Pressure Bar （SHPB） and MTS test machine. The results indicated that the biaxial warp-knitted （BWK） composite was strain rate sensitive. The failure stress and the compressive modulus were increased with the increasof strain rate while the failure strain was decreased. With the increase of the strain rate, the damage is more serious and failure mode is clearer. In addition, the compressive properties along the out-plane direction was much better than those of the in-plane direction. Differences of compressive properties were also observed between the warp direction and the weft direction. Thus, the composite was verified to be anisotropie. The photographs of the damaged composites at various strain rates showed that at out-plane direction the main failure mode was the interlaminar shear failure, while at in-plane direction the delamination was the main failure mode except the shear failure at quasi-stat-ic compression. This paper provides a better understanding of the failure mechanism of bi-axial warp-knitted （BWK） composite.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2014年第10期62-65,31,共5页
Fiber Reinforced Plastics/Composites
