Assessment of experimental methods for calibrating rate-dependent cohesive zone models for predicting failure in adhesively bonded metallic structures

Damage modeling approach is increasingly used to simulate fracture and debonding processes in adhesively bonded joint. In order to understand the relation between the delamination behavior of different types of adhesives and the type of cohesive zone models (CZMs), the pure tension and pure shear experiments were conducted used two distinct adhesives, an epoxy-based adhesive in a brittle manner and VHBTM tape adhesive in a ductile manner. The traction-separation relations of the two adhesives were extracted from the tension and shear experimental results. Three types of cohesive zone models (CZMs) are adopted, including the exponential, bilinear, and trapezoidal models. VUMAT subroutine of CZMs as the adhesive layer is used to simulate the specimen tension and shear debonding procedures. The results demonstrate that (i) the bilinear CZM more suitably describes the brittle adhesive and the exponential CZM suitably describes the ductile adhesive to simulate the tension and shear failure. (ii) cohesive strength and work of separation are the significant affections on the simulation results. and (iii) the shape of CZM is a significant affections on the simulation the pure tension and shear debonding procedure.

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Mixed-mode cohesive-zone models for fracture of an adhesively bonded polymer–matrix composite

Engineering Fracture Mechanics ◽

10.1016/j.engfracmech.2005.07.004 ◽

2006 ◽

Vol 73 (1) ◽

pp. 64-78 ◽

Cited By ~ 159

Author(s):

S. Li ◽

M.D. Thouless ◽

A.M. Waas ◽

J.A. Schroeder ◽

P.D. Zavattieri

Keyword(s):

Matrix Composite ◽

Polymer Matrix ◽

Cohesive Zone ◽

Mixed Mode ◽

Polymer Matrix Composite ◽

Adhesively Bonded ◽

Cohesive Zone Models

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A Direct Method for the Assessment of Cohesive Zone Models for Thin Adhesive Layers Loaded in Mode I, Mode II, and Mixed-Mode I/II

Reviews of Adhesion and Adhesives ◽

10.7569/raa.2018.097301 ◽

2020 ◽

Vol 8 (2) ◽

pp. S1-S31 ◽

Cited By ~ 3

Author(s):

E. Paroissien ◽

F. Lachaud ◽

J. Morlier ◽

S. Schwartz

Keyword(s):

Cohesive Zone ◽

Mixed Mode ◽

Direct Method ◽

Mode Interaction ◽

Mode I ◽

Mode Ii ◽

Pure Mode ◽

Adhesively Bonded ◽

Cohesive Zone Models ◽

A Direct Method

In the context of increasing the strength-to-mass ratio of lightweight structures, the adhesively bonded joining technology appears to be an attractive solution. Nevertheless, the adhesive bonding method is important when the structural integrity of joints has to be ensured. In the literature, the cohesive zone models (CZMs) are shown to be able to predict both the static and fatigue strengths of adhesively bonded joints. The strength prediction is dependent on material laws and associated material parameters, characterizing the bondline behaviour mainly under pure mode I, mode II and mixed-mode I/II. The characterization methods are thus crucial. This paper aims at assessing the capabilities to identify the parameters of a particular CZM for both the inverse method, based on the energy balance associated with the path independent J-integral, and of a direct method described in this present work. The particular CZM has a classical shape based on the definition of a bilinear law for each of both pure modes, associated with pure mode interaction energy laws for initiation and propagation under mixed-mode I/II. The methodology used in this paper is based on a numerical test campaign only, involving the macro-element (ME) technique. A new approach for the fast formulation and implementation of ME modelling of two bonded beams is described.

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