编织物增强层板的抗冲击性研究

STUDY ON IMPACT RESISTANCE OF WOVEN-FABRIC LAMINATES

对受到中心冲击的一系列平纹编织Ｓ－ｇｌａｓ／ｅｐｏｘｙ和Ｋｅｖｌａｒ／ｅｐｏｘｙ层板及由此产生的损伤情况进行了研究，并采用有限元程序对层板的应力状态进行分析。发现层板铺层角的变化对冲击载荷－时间曲线没有显著影响；随冲击速度的提高，铺层角变化对层板损伤的影响变得显著；铺层角的错配可以偏转冲击裂纹的扩展方向；Ｋｅｖｌａｒ纤维的高延伸率和弱粘结性使得它的局域应力幅值高于Ｓ－ｇｌａｓｓ层板，从而导致了穿透现象的出现。

Systematic experimental studies on the sequential damage of centrally impacted composite laminates have been conducted using plan-woven-fabric S-glass/epoxy and Kevlar/epoxy laminates. The finite element code was developed to understand the stresses distributions in the plates. Based on the study, it can be concluded that the ply orientation has an influence on the force-time histories of laminates. With the impact velocity increasing, the influence of the ply orientation on the damage mode and extent becomes obvious, mismatch of ply orientation can deflect the propagation of impact induced cracks. The high tensility and weak bonding make the amplitudes of localized stresses are higher than those in laminates consisting of S-glass fibers which causes penetration in plates.