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Open hole compressive elastic and strength analysis of CFRE composites for aerospace applications

机译：航空航天CFRE复合材料的开孔压缩弹性和强度分析

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This paper presents an experimental and analytical study of hole-size effect on the compressive properties of woven carbon fiber-reinforced epoxy composites. The composite laminates were cut into the standard dimensions of compression after impact specimens with different center hole sizes using abrasive waterjet machine to avoid thermal and mechanical defects that were associated with conventional drilling processes. Damage development was monitored using instrumented specimens with 8-strain gauges. For the first time, the strain transverse to the hole edge thickness and perpendicular to the loading axis is measured, which has important contribution to interpreting the damage free at this position with the aid of scanning electron microscope images. In addition, a new analysis about increasing the slope (stiffening) of axial surface strain with the applied load was proposed. The predicted strain distribution in the vicinity of the hole has acceptable agreement with the experimental measurements. The compressive strength was measured and predicted by several two-parameter fracture models. Three-parameter fracture models are employed to improve the predicted compressive strength. The results showed that the critical stress intensity factor increased with the hole size and vice versa for the compressive strength and stiffness. An excellent agreement is found between the measured and predicted compressive strengths using three-parameter fracture models (R-2 >= 99.5%). Damage initiation was effectively detected at about 77% of the ultimate stress using the instrumented specimens. (C) 2016 Elsevier Masson SAS. All rights reserved.
机译：本文介绍了孔径对碳纤维增强环氧复合材料压缩性能的影响的实验和分析研究。使用研磨水刀将复合层压板切割成具有不同中心孔尺寸的冲击试样后，压缩为标准尺寸，以避免与常规钻孔工艺相关的热和机械缺陷。使用带有8应变仪的仪器化的标本监测损伤的发展。首次测量了横向于孔边缘厚度且垂直于加载轴的应变，这对于借助扫描电子显微镜图像解释该位置的无损损伤具有重要作用。另外，提出了一种新的分析方法，即随着施加的载荷增加轴向表面应变的斜率（加劲度）。孔附近的预测应变分布与实验测量值可以接受。通过几个两参数断裂模型来测量和预测抗压强度。使用三参数断裂模型来提高预测的抗压强度。结果表明，临界应力强度因子随孔尺寸的增加而增加，反之亦然。使用三参数断裂模型（R-2> = 99.5％）可以在测得的抗压强度和预测的抗压强度之间找到极好的一致性。使用仪器化的标本可以有效地检测到最终应力的大约77％处的损伤开始。 （C）2016 Elsevier Masson SAS。版权所有。

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