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Matrix crack induced stiffness reductions in [(0(m)/90(n)/+theta(p)/-theta(q))(s)](m) composite laminates
KTH, Superseded Departments, Solid Mechanics.
KTH, Superseded Departments, Solid Mechanics.ORCID iD: 0000-0002-0307-8917
1995 (English)In: Composites Engineering, ISSN 0961-9526, Vol. 5, no 1, 107-123 p.Article in journal (Refereed) Published
Abstract [en]

Two- and three-dimensional linearly elastic glass/epoxy and carbon/epoxy laminates of the type [(0m/90n/ + theta(p)/ - theta(q))s]M containing periodically distributed matrix cracks have been analysed by aid of the finite element method. The presented finite element model enables modelling of several important thick and thin ply stacking sequences like cross-plies, angle plies and quasi-isotropic laminates. Due to periodicity it suffices to model a representative volume element of the laminate. The boundaries of this unit cell represent prospective crack surfaces. In this way varying crack configurations and crack densities could be simulated. By application of periodic boundary conditions the stiffness tensors for laminates containing different crack configurations were calculated. The results are presented in the form of reduced engineering stiffness parameters as functions of matrix crack densities for a thick quasi-isotropic [(0-degree/90-degrees/ + 45-degrees/ -45-degrees)s]M glass/epoxy laminate, a thick [(0-degree/90-degrees + 55-degrees/ - 55-degrees)s]M carbon/epoxy laminate and a thin (0-degree/ +45-degrees/ -45-degrees)s glass/epoxy laminate. Comparisons are made to an approximate analytic model developed previously. An excellent agreement between the analytic predictions and the finite element results was found for all cases under consideration.

Place, publisher, year, edition, pages
1995. Vol. 5, no 1, 107-123 p.
Keyword [en]
Boundary conditions, Calculations, Carbon, Computer simulation, Cracks, Epoxy resins, Finite element method, Glass, Mathematical models, Stiffness, Tensors, Carbon/epoxy laminate, Composite laminate, Crack configuration, Crack density, Glass/epoxy laminate, Matrix crack induced stiffness reduction, Ply stacking sequence, Volume element
National Category
Mechanical Engineering Materials Engineering
URN: urn:nbn:se:kth:diva-25480DOI: 10.1016/0961-9526(95)93983-3ISI: A1995QN55400010OAI: diva2:358733
QC 20101025Available from: 2010-10-25 Created: 2010-10-25 Last updated: 2010-10-25Bibliographically approved

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