Translaminar fracture toughness: The critical notch tip radius of 0° plies in CFRP

被引：57

作者：

Laffan, M. J. ^{[1
]}

Pinho, S. T. ^{[1
]}

Robinson, P. ^{[1
]}

McMillan, A. J. ^{[2
,3
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Aeronaut, London SW7 2AZ, England

[2] Rolls Royce Plc, Derby DE24 8BJ, England

[3] Univ Bristol, ACCIS, Bristol BS8 1US, Avon, England

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2011年 / 72卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

Fracture toughness; Notch; Fractography; SEM; ROOT RADIUS; COMPOSITES; FAILURE;

D O I：

10.1016/j.compscitech.2011.10.006

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

The relationship between translaminar fracture toughness measured at initiation and specimen initial notch root radius is investigated for the translaminar failure mode of cross-ply IM7/8552 carbon/epoxy laminates. Compact tension specimens with four sizes of notch root radii were tested; the true initiation toughness of the laminate was measured from specimens with notch tip radii of p 250 mu m. Testing of specimens with larger notch root radii, rho = 750 mu m, yielded an apparent toughness that was found to be 30% higher than the true toughness of the laminate. The propagation toughness corresponding to the R-curve plateau was found not to be affected by the initial notch tip radius. Investigation of the fracture surfaces of failed specimens revealed that there is no interaction between the 0 and 90 ply failure mechanisms, and that the critical notch radius is a property intrinsic to the 0 plies of the laminate. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：97 / 102

页数：6

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