期刊
COMPOSITES PART B-ENGINEERING
卷 123, 期 -, 页码 219-226出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2017.05.016
关键词
-
An experimental investigation is presented into the improvement to the delamination fatigue resistant properties of z-pinned carbon fibre epoxy composite under mixed-mode I/II cyclic interlaminar loading. Delamination fatigue tests are performed on unpinned and z-pinned composites under different mixed mode ratios spanning mode I to mode II interlaminar cyclic conditions. The fatigue resistance and fatigue strengthening mechanisms induced by the z-pins is dependent on the cyclic mixed-mode ratio. The threshold critical strain energy release rate needed to initiate delamination growth in the z-pinned composite increases with the G(I)-to-G(II) ratio. The fatigue crack growth rate slows considerably and the critical strain energy release rate for fast fatigue fracture increases with the G(I)-to-G(II) ratio. The delamination fatigue strengthening induced by the z-pins increases with the G(I)-to-G(II) ratio due to a transition in the crack bridging toughening process from pin pull-out under mode I dominated loads to combined tensile and shear fracture under mixed-mode loads to pin shear rupture under mode II dominated loads. It is also found that the effect of the G(I)-to-G(II) ratio on the fatigue properties is greater for the z-pinned composite compared to the unpinned laminate due to the high fatigue sensitivity of z-pins to the mixed mode ratio. (C) 2017 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据