Transverse Crack Initiation in Thin-Ply Laminates Subjected to Tensile Loading at Low and Cryogenic Temperatures

IF 1.5 4区 材料科学 Q4 MATERIALS SCIENCE, COMPOSITES Mechanics of Composite Materials Pub Date : 2024-01-03 DOI:10.1007/s11029-023-10156-0
A. Pupurs, M. S. Loukil, E. Marklund, J. Varna, D. Mattsson
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Abstract

Laminates with ultra-thin plies is a promising new development for polymeric composite materials expected to provide superior resistance to intralaminar crack propagation. The ply thickness effect on the crack initiation stress that according to some theoretical studies on fiber/matrix debonding does not depend on the ply thickness was investigated. Ultra-thin ply carbon fiber/epoxy cross-ply laminates subjected to tensile loading at room, –50, and –150°C temperatures relevant for cryogenic fuel storage, aeronautical, and aerospace applications were studied. The stochastic nature of the crack initiation stress in the 90°-plies was analyzed using Weibull strength distribution. The results obtained show delayed transverse crack initiation only in the thinnest plies with a clear trend that the scale parameter is much larger. This thickness effect on initiation is different than that for crack propagation which is observable in much larger ply thickness range. Regarding crack propagation, it was found that in most cases even at very high applied strain levels (1.5%) only a few transverse cracks have propagated from the specimen edges to its middle.

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薄层板在低温和低温拉伸载荷下的横向裂纹萌发
超薄层压板是聚合复合材料的一种有前途的新发展,有望提供卓越的层内裂纹扩展阻力。根据一些关于纤维/基质脱粘的理论研究,层厚对裂纹起始应力的影响并不取决于层厚。研究了在室温、-50 和 -150°C 温度下承受拉伸载荷的超薄碳纤维/环氧交叉层压板,这些层压板适用于低温燃料储存、航空和航天应用。使用 Weibull 强度分布分析了 90° 层板中裂纹起始应力的随机性质。研究结果表明,只有最薄层的横向裂纹起始延迟,且明显趋势是尺度参数越大越延迟。这种厚度对起始的影响不同于对裂纹扩展的影响,后者在更大的层厚范围内均可观察到。关于裂纹扩展,研究发现,在大多数情况下,即使施加了很高的应变水平(1.5%),也只有少数横向裂纹从试样边缘向中间扩展。
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来源期刊
Mechanics of Composite Materials
Mechanics of Composite Materials 工程技术-材料科学:复合
CiteScore
2.90
自引率
17.60%
发文量
73
审稿时长
12 months
期刊介绍: Mechanics of Composite Materials is a peer-reviewed international journal that encourages publication of original experimental and theoretical research on the mechanical properties of composite materials and their constituents including, but not limited to: damage, failure, fatigue, and long-term strength; methods of optimum design of materials and structures; prediction of long-term properties and aging problems; nondestructive testing; mechanical aspects of technology; mechanics of nanocomposites; mechanics of biocomposites; composites in aerospace and wind-power engineering; composites in civil engineering and infrastructure and other composites applications.
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