A Model of Damage for Brittle and Ductile Adhesives in Glued Butt Joints
Résumé
The paper presents a new analytical model for thin structural adhesives in glued tube-totube
butt joints. The aim of this work is to provide an interface condition that allows for a suitable
replacement of the adhesive layer in numerical simulations. The proposed model is a nonlinear
and rate-dependent imperfect interface law that is able to accurately describe brittle and ductile
stress–strain behaviors of adhesive layers under combined tensile–torsion loads. A first comparison
with experimental data that were available in the literature provided promising results in terms of the
reproducibility of the stress–strain behavior for pure tensile and torsional loads (the relative errors
were less than 6%) and in terms of failure strains for combined tensile–torsion loads (the relative
errors were less than 14%). Two main novelties are highlighted: (i) Unlike the classic spring-like
interface models, this model accounts for both stress and displacement jumps, so it is suitable for soft
and hard adhesive layers; (ii) unlike classic cohesive zone models, which are phenomenological, this
model explicitly accounts for material and damage properties of the adhesive layer.
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