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Statistical model of the transverse ply cracking in cross-ply laminates by strength and fracture toughness based failure criteria
Institute of Polymer Mechanics, University of Latvia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-5210-4341
2008 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 75, no 9, p. 2651-2665Article in journal (Refereed) Published
Abstract [en]

Cross-ply laminate subjected to tensile loading provides a relatively well understood and widely used model system for studying progressive cracking of the transverse ply. This test allows to identify material strength and/or toughness characteristics as well as to establish relation between damage level and the composite stiffness reduction. The transverse ply cracking is an inherently stochastic process due to the random variability of local material properties of the plies. The variability affects both crack initiation (governed by the local strength) and propagation (governed by the local fracture toughness). The primary aim of the present study is elucidation of the relative importance of these phenomena in the fragmentation process at different transverse and longitudinal ply thickness ratios. The effect of the random crack distribution on the mechanical properties reduction of the laminate is also considered. Transverse ply cracking in glass fiber/epoxy cross-ply laminates of the lay-ups [02/902]s, [0/902]s, and [0/904]s is studied. Several specimens of each lay-up were subjected to uniaxial quasistatic tension to obtain crack density as a function of applied strain. Crack spacing distributions at the edge of the specimen also were determined at a predefined applied strain. Statistical model of the cracking process is derived, calibrated using crack density vs. strain data, and verified against the measured crack spacing distributions.

Place, publisher, year, edition, pages
2008. Vol. 75, no 9, p. 2651-2665
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-3244DOI: 10.1016/j.engfracmech.2007.03.007ISI: 000255253500007Scopus ID: 2-s2.0-40649116946Local ID: 10c2f0c0-91ed-11dc-9a81-000ea68e967bOAI: oai:DiVA.org:ltu-3244DiVA, id: diva2:976100
Note
Validerad; 2008; 20071113 (joffe)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Joffe, RobertsSparnins, Edgars

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