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A study on the compressive strength of thick carbon fibre-epoxy laminates

机译：厚碳纤维 - 环氧树脂层压板抗压强度的研究

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This paper describes an experimental study that examines the effect of specimen size on the axial compressive strength of IM7/8552 carbon fibre/epoxy unidirectional laminates (UD). Laminate gauge length, width and thickness were increased by a scaling factor of 2 and 4 from the baseline specimen size of 10 mm × 10 mm × 2 mm. In all cases, strength decreased as specimen size increased, with a maximum reduction of 45%; no significant changes were observed for the axial modulus. Optical micrographs show that the failure mechanism is fibre microbuckling accompanied by matrix cracking and splitting. The location of failure in most specimens, and especially the thicker ones, is where the tabs terminate and the gauge section begins suggesting that the high local stresses developed due to geometric discontinuity contribute to premature failure and, hence, reduced compressive strength. Two generic quasi-isotropic multi-directional (MD) lay-ups were also tested in compression, one with blocked plies [45n/90n/-45n/0n]s and the other with distributed plies [45/90/-45/0]ns with n = 2, 4 and 8. The material used and test fixture was identical to that of the unidirectional specimens with three different gauge sections (30 mm × 30 mm, 60 mm × 60 mm and 120 mm × 120 mm) to establish any size effects. Strength results showed no evidence of a size effect when the specimens are scaled up using distributed plies and compared to the 2 mm thick specimens. All blocked specimens had similar compressive strengths to the sublaminate ones apart of the 8 mm specimens that showed a 30% reduction due to extensive matrix cracking introduced during the specimen's cutting process. The calculated unidirectional failure stress (of the 0° ply within the multidirectional laminate) of about 1710 MPa is slightly higher than the average measured value of 1570 MPa of the 2 mm thick baseline unidirectional specimen, suggesting that the reduced unidirectional strength observed for the thicker specimens is a testing artefact. It appears that the unidirectional compressive strength in thicker specimens (>2 mm) is found to be limited by the stress concentration developed at the end-tabs and manufacturing induced defects such as fibre misalignment, ply waviness and voids. © 2006 Elsevier Ltd. All rights reserved.
机译：本文描述了一项实验研究，该研究研究了试样尺寸对IM7 / 8552碳纤维/环氧树脂单向层压板（UD）的轴向抗压强度的影响。从基线样品尺寸10 mm×10 mm×2 mm起，层压板的长度，宽度和厚度增加了2和4的比例因子。在所有情况下，强度都会随着试样尺寸的增加而降低，最大降低幅度为45％。没有观察到轴向模量的显着变化。光学显微照片显示，破坏机理是纤维微屈曲，伴随着基体开裂和分裂。在大多数试样中，尤其是较厚的试样，断裂的位置是接片终止且量规部分开始的位置，这表明由于几何不连续而产生的高局部应力会导致过早断裂，从而降低了抗压强度。还对两个通用的准各向同性多方向（MD）叠层进行了压缩测试，一个叠层[45n / 90n / -45n / 0n] s阻塞，另一个叠层[45/90 / -45 / 0] s ] ns，n = 2、4和8。所使用的材料和测试夹具与具有三个不同规格截面（30 mm×30 mm，60 mm×60 mm和120 mm×120 mm）的单向试样相同。建立任何大小效果。强度结果表明，当使用分布层将标本按比例放大并与2 mm厚的标本进行比较时，没有尺寸效应的证据。除8mm的样品外，所有块状样品的抗压强度与次层压样品相同，由于在样品的切割过程中引入了广泛的基体裂纹，因此压缩强度降低了30％。计算得出的（多向层压板中0°层的）单向破坏应力约为1710 MPa，略高于2 mm厚的基线单向试样的平均测量值1570 MPa，这表明较厚的单向试样降低了的单向强度标本是一个测试文物。似乎发现较厚的样品（> 2 mm）中的单向抗压强度受到端接片上产生的应力集中和制造引起的缺陷（如纤维未对准，帘布层起伏和空隙）的限制。 ©2006 ElsevierLtd。保留所有权利。

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    Lee, J.; Soutis, C.;

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  • 年度 2007
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