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Materials Science Communication Compressive strength of delaminated and repaired composite plates

机译：材料科学通报层合修复复合板的抗压强度

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摘要

Compressive strength is a critical concern in the design of fiber-reinforced adhesive matrix composite plates. This is mainly due to the fact that compressive strength is generally lower than tensile strength for most advanced fiber-reinforced composites, e.g., 180 Ksi versus 200 Ksi for a graphite/epoxy composite T300/976 (HYE-1076E). In this study, the compressive strength is used to assess the effect of delamination and repair of T300/976 graphite/epoxy composite plates. The sequence and dimension of composite test plates are [0/45/90/-45/-45/90/45/0]s and 4 x 6 in., respectively. A peel ply is used to separate the plies and to make the delamination across the test plate. The delamination is located at the center and between the 8th and 9th plies. The sizes of delamination are 1/4, 3/4, 1, 3 and 6 in. The compression test of delaminated plates is performed and the effect of delamination on strength is estimated from the compressive strength. The adhesive injection method is the primary approach for repairing delamination without removing the delaminated materials. A two-part low viscosity adhesive (EA9394) is injected into the delaminated area and re-bonds the damaged area. The repair efficiency is assessed by compressive strength of repaired composite. The experimental results show that the compressive strength of delaminated composite plate is reduced as the delaminated area increases, and the repair efficiency of repaired plate is also reduced as the re-bonded area decreases. If the adhesive can fully fill and re-bond the delaminated plies, the repair efficiency can be as high as 98% and satisfy the repair requirement. As a result, the adhesive injection method is seen to be a useful repair method for the delaminated composites.
机译：抗压强度是纤维增强粘合剂基质复合板设计中的关键问题。这主要是由于以下事实：对于大多数先进的纤维增强复合材料，抗压强度通常低于拉伸强度，例如，对于石墨/环氧树脂复合材料T300 / 976（HYE-1076E），抗压强度为180 Ksi对200 Ksi。在这项研究中，抗压强度用于评估T300 / 976石墨/环氧树脂复合板的分层和修复效果。复合测试板的顺序和尺寸分别为[0/45/90 / -45 / -45 / 90/45/0] s和4 x 6英寸。剥离层用于分离层并在测试板上进行分层。分层位于中间，位于第8层和第9层之间。分层的大小为1 / 4、3 / 4、1、3和6英寸。执行分层板的压缩测试，并根据压缩强度估算分层对强度的影响。胶粘剂注入法是修复分层而不去除分层材料的主要方法。将两部分的低粘度粘合剂（EA9394）注入分层区域中，然后重新粘合受损区域。通过修复后的复合材料的抗压强度评估修复效率。实验结果表明，随着脱层面积的增加，脱层复合板的抗压强度降低；随着再粘结面积的减小，修复板的修复效率也随之降低。如果粘合剂可以完全填充并重新粘合分层的帘布层，则修复效率可以高达98％并满足修复要求。结果，粘合剂注入方法被认为是用于分层复合材料的有用的修复方法。

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