Authors: Ogi, Keiji¹; Ogihara, Shinji²; Shigeki, Yashiro³

Source: Advanced Composite Materials, Volume 19, Number 1, 2010 , pp. 1-17(17)

Publisher: VSP, an imprint of Brill

Abstract:

This paper presents a probabilistic fatigue model for transverse cracking in CFRP cross-ply laminates. First, a delayed fracture model for a crack in a brittle material subjected to cyclic loading was established on the basis of the slow crack growth (SCG) concept in conjunction with the Weibull's probabilistic failure model. Second, the above probabilistic delayed fracture model was applied to transverse cracking in cross-ply laminates during cyclic loading. The stress distribution and the length of the unit element were calculated with the aid of a shear lag analysis. The transverse crack density was expressed as a function of maximum stress, stress ratio and number of cycles using the parameters associated with the Paris equation and the Weibull distribution in addition to the mechanical properties. Unknown parameters were determined from experiment data for three kinds of cross-ply laminates to reproduce the transverse crack density against the number of cycles. The parametric studies using the obtained parameters revealed the effects of the Weibull modulus, crack propagation exponent and stress ratio on evolution of transverse cracking under fatigue loading.

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Keywords: COMPOSITE LAMINATE; TRANSVERSE CRACKING; FATIGUE; PROBABILISTIC FAILURE; DELAYED FRACTURE

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156855109X434784

Affiliations: 1: School of Science and Engineering, Ehime University, 3, Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan;, Email: kogi@eng.ehime-u.ac.jp 2: Faculty of Science and Technology, Tokyo University of Science, 2641, Yamazaki, Noda, Chiba, 278-8510, Japan 3: School of Science and Engineering, Ehime University, 3, Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan

Publication date: 2010-01-01

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