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A THEORETICAL AND EXPERIMENTAL INVESTIGATION OF DYNAMIC DELAMINATION IN COMPOSITES
Author(s) -
Thesken J. C.
Publication year - 1995
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1995.tb00844.x
Subject(s) - materials science , orthotropic material , composite material , bridging (networking) , delamination (geology) , fracture toughness , fiber pull out , finite element method , displacement (psychology) , fracture mechanics , composite number , structural engineering , composite laminates , engineering , computer science , subduction , biology , psychology , computer network , paleontology , psychotherapist , tectonics
A fundamental understanding of dynamic delamination in composites is sought through the application of theoretical and experimental approaches familiar to dynamic fracture mechanics. Analysis of steady‐state fracture in an infinite orthotropic strip yields a simple solution which can be used to evaluate numerical procedures and experimental results. The analogous specimen consists of a single edge notched composite strip bonded to stiff steel substrates to enforce the desired displacement boundary conditions. Delamination velocities of the order of 10 to 1000 m/s were measured using a graphite gauge technique. Quasi‐static and dynamic finite element methods are applied to investigate the behavior of the specimen and to determine static initiation and dynamic delamination toughness. The experimental observations cannot be explained by linear elastic fracture theory. The absence of a unique G (ȧ) relationship might be rationalized by a simple model relating matrix crack zone size to fiber bridging mechanisms.