Effects of fibre/matrix adhesion on carbon-fibre-reinforced metal laminates - I. Residual strength
Effects of fibre/matrix adhesion on carbon-fibre-reinforced metal laminates - I. Residual strength
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DOI：
10.1016/s0266-3538(97)00108-5
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发表时间：
1997-01-01
影响因子：
9.1
通讯作者：
Sun, CT
中科院分区：
文献类型：
--
作者：
Lawcock, GD;Ye, L;Sun, CT
本文研究了纤维与基体间的界面粘结对碳纤维增强金属层板（FRML）剩余强度行为的影响。通过在环氧树脂体系中使用处理过的和未处理过的碳纤维，获得了纤维/基体粘结的差异。机械特性测试进行散装复合材料试样，以确定各种性能，如层间剪切强度（ILSS）和横向拉伸强度，清楚地说明了纤维/基体界面粘合的差异。扫描电子显微镜证实了断裂表面的差异，未处理的纤维复合材料显示界面失效，而处理的纤维复合材料显示基体失效。没有发现明显的差异，如拉伸强度和杨氏模量的FRML的机械性能，尽管在散装复合材料的性能差异。通过三点和五点弯曲试验，确定未处理纤维层压板的ILSS表观值降低7.5%。剩余强度和钝缺口试验表明，未处理的纤维试样的强度显着增加处理的。增加高达20%和14%，发现与圆孔和锯切标本，分别。强度的增加是由于促进纤维/基体分裂和大的分层区，在未经处理的纤维试样，由于弱的纤维/基体界面。(C)1998爱思唯尔科技有限公司版权所有。
The role of interfacial adhesion between fibre and Matrix on the residual strength behaviour of carbon-fibre-reinforced metal laminates (FRMLs) has been investigated Differences in fibre/matrix adhesion were achieved by using treated and untreated carbon fibres in an epoxy resin system. Mechanical characterisation tests were conducted on bulk composite specimens to determine various properties such as interlaminar shear strength (ILSS) and transverse tension strength which clearly illustrate the difference in fibre/matrix interfacial adhesion. Scanning electron microscopy confirmed the difference in fracture surfaces, the untreated fibre composites showing interfacial failure while the treated fibre composites showed matrix failure. No clear differences were found for the mechanical properties such as tensile strength and Young's modulus of the FRMLs despite the differences in the bulk composite properties. A reduction of 7.5% in the apparent value of the ILSS was identified for the untreated fibre laminates by both three-point and five-point bend tests. Residual strength and blunt notch tests showed remarkable increases in strength for the untreated fibre specimens over the treated ones. Increases of up to 20% and 14% were found for specimens with a circular hole and saw cut, respectively. The increase in strength is attributed to the promotion of fibre/matrix splitting and large delamination zones in the untreated fibre specimens owing to the weak fibre/matrix interface. (C) 1998 Elsevier Science Ltd. All rights reserved.