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Interfacial model for crash resistant adhesives of ductile‐modified epoxy resins
Author(s) -
Matzenmiller A.,
Burbulla F.
Publication year - 2010
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201010356
Subject(s) - epoxy , materials science , adhesive , composite material , constitutive equation , finite element method , structural engineering , layer (electronics) , engineering
Abstract Debonding in adhesive joints is modelled and analyzed with the concept of interfacial mechanics. Material equations are presented for the inelastic behaviour of ductile‐modified epoxy resins. A two surface function for the onset of yielding is advantageously expressed in terms of the stress vector on the interface. The theory may be extended to material softening due to damage and to rate dependency. This simple constitutive model is not stable in the sense of Drucker's postulate. Therefore, the non‐associated flow rule is modified with a quadratic stress‐dependent plastic potential. The material parameters are identified by means of the finite‐element simulation of the experimental setup for a bluntly glued double steel tube sample. The numerical performance of this modified model is tested at an adhesively bonded joint in the form of a T‐intersection. (© 2010 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)