Inter-ply angle influence on the out-of-plane compressive response of polyethylene fibre laminates
Inter-ply angle influence on the out-of-plane compressive response of polyethylene fibre laminates
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DOI：
10.1016/j.compositesa.2018.03.032
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
M. O’Masta;B. Russell;W. Ronan
中科院分区：
文献类型：
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作者：
M. O’Masta;B. Russell;W. Ronan
超高分子量聚乙烯 (UHMWPE) 纤维增强复合材料广泛用于冲击防护应用。当面外（全厚度）压缩加载时，由典型的交叉层铺层（层间角 θ= 90°）组成的 UHWMPE 层压材料已知会通过剪切滞后机制表现出纤维拉伸断裂。这项研究探讨了层间角度 (θ= 18–90°) 对 UHMWPE 层压板压缩响应的影响，并表明它们可能会因这种间接张力机制而失效。剪切滞后长度随着 θ 的减小而增加，这会降低小样本尺寸下的抗压强度。以前通过该机制预测压缩破坏的分析模型适用于具有非正交但恒定层间角度的层压板。这些预测捕获了两个关键的实验观察结果，这些观察结果取决于层间角度和样本大小：从层剪切破坏到间接纤维拉伸断裂的转变以及压缩强度。
Ultra-high molecular weight polyethylene (UHMWPE) fibre reinforced composites find extensive use in impact protection applications. When loaded in out-of-plane (through thickness) compression, UHWMPE laminates composed of a typical cross-ply lay-up (an inter-ply angle of θ= 90°) are known to exhibit fibre tensile rupture via a shear-lag mechanism. This study addresses the effect of inter-ply angle (θ= 18–90°) on the compressive response of UHMWPE laminates and shows they may fail by this indirect tension mechanism. The shear-lag length increases as θ is reduced, which reduces the compressive strength at small sample sizes. A previous analytical model to predict compressive failure by this mechanism is generalised for laminates with non-orthogonal but constant inter-ply angles. The predictions capture the two key experimental observations which are dependent on inter-ply angle and sample size: the transition from ply shear failure to indirect fibre tensile rupture and the compressive strength.