Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5014227 | Engineering Fracture Mechanics | 2016 | 16 Pages |
Abstract
In this paper is presented the behaviour of PUR foams under mixed mode loading. Closed cell rigid PUR foams having three different densities 100, 145, and 300Â kg/m3 were investigated. Experiments were performed using asymmetric semi-circular bend (ASCB) and Assymmetric Four-Point Bend (AFPB) specimens. The obtained crack initiation angles established for ASCB specimens were compared with four fracture criteria MTS, SED, Gmax and ESIF, and a good agreement was observed. When testing AFPB specimens, and calculating the normalized stress intensity factors it is important to obtain a correct crack propagation, that is to impose proper geometrical dimensions as not to affect the initial crack tip. The eXtended Finite Element Method (XFEM) is a complementary powerful numerical tool used to analyze crack initiation and propagation only if the numerical model is correctly calibrated and all the influencing parameters are properly understood.
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Authors
Liviu Marsavina, Dan M. Constantinescu, Emanoil Linul, Florin A. Stuparu, Dragos A. Apostol,