scholarly journals Modelling adhesive joints with cohesive zone models: effect of the cohesive law shape of the adhesive layer

2013 ◽  
Vol 44 ◽  
pp. 48-56 ◽  
Author(s):  
R.D.S.G. Campilho ◽  
M.D. Banea ◽  
J.A.B.P. Neto ◽  
L.F.M. da Silva
Keyword(s):  
Cohesive Zone ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Cohesive Law ◽  
Cohesive Zone Models

scholarly journals Evaluation of Fracture Behavior of Adhesive Layer in Fiber Metal Laminates using Cohesive Zone Models

2016 ◽  
Vol 29 (2) ◽  
pp. 45-52 ◽  
Author(s):  
Byoung-Eon Lee ◽  
Eu-Tteum Park ◽  
Dae-Cheol Ko ◽  
Beom-Soo Kang ◽  
Woo-Jin Song
Keyword(s):  
Cohesive Zone ◽  
Fracture Behavior ◽  
Adhesive Layer ◽  
Fiber Metal Laminates ◽  
Cohesive Zone Models ◽  
Fiber Metal

Measurement of Cohesive Laws and Related Problems

2009 ◽  
Author(s):  
Ulf Stigh ◽  
K. Svante Alfredsson ◽  
Anders Biel
Keyword(s):  
Cohesive Zone ◽  
Adhesive Layer ◽  
J Integral ◽  
Material Behaviour ◽  
Cohesive Law ◽  
Simple Method ◽  
Process Region ◽  
Path Independence ◽  
Cohesive Laws ◽  
Separation Relation

Cohesive modelling provides a simple method to introduce a process region in models of fracture. It is computationally attractive since it blends into the structure of finite element programmes for stress analysis. The development of computational methods and applications of cohesive modelling has accelerated during recent years. Methods to measure cohesive laws have also been developed. One class of such methods is based on the path-independence of the J-integral. By choosing a path encircling the cohesive zone, J can be shown to be given by the area under the traction-separation relation for the cohesive zone. Using an alternative path, J can in some cases be directly related to the applied load and deformation with relatively modest or no assumptions on the material behaviour. Thus, the cohesive law can be measured. Methods to measure cohesive laws for different specimen geometries are presented. The methods are used to measure the cohesive law in peel, shear and mixed-mode for an adhesive layer. A new method to measure cohesive laws in shear is presented. The method is shown to give accurate data with a much smaller test specimen than earlier methods.

Performance of Cohesive Zone Models for Brittle and Ductile Adhesives

2014 ◽  
Vol 941-944 ◽  
pp. 2089-2092
Author(s):  
Jun Zhang ◽  
Hong Jia
Keyword(s):  
Cohesive Zone ◽  
Shear Failure ◽  
Pure Shear ◽  
Adhesive Layer ◽  
Adhesively Bonded ◽  
Cohesive Zone Models ◽  
Pure Tension ◽  
Bonded Joint ◽  
Adhesively Bonded Joint ◽  
Delamination Behavior

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.

Mode I fracture of adhesive joints using tailored cohesive zone models

2008 ◽  
Vol 157 (1-2) ◽  
pp. 193-204 ◽  
Author(s):  
M. Alfano ◽  
F. Furgiuele ◽  
A. Leonardi ◽  
C. Maletta ◽  
G. H. Paulino
Keyword(s):  
Cohesive Zone ◽  
Adhesive Joints ◽  
Mode I ◽  
Cohesive Zone Models ◽  
Mode I Fracture

scholarly journals Influence of the Cohesive Law Parameters on the Strength Prediction of Adhesively-Bonded Joints

2012 ◽  
Vol 730-732 ◽  
pp. 1000-1005
Author(s):  
Raul D.S.G. Campilho ◽  
Filipe J.P. Chaves ◽  
Arnaldo M.G. Pinto ◽  
Mariana D. Banea ◽  
Lucas F.M. da Silva
Keyword(s):  
Cohesive Zone ◽  
Adhesive Layer ◽  
Strength Prediction ◽  
Bonded Joints ◽  
Fracture Criteria ◽  
Cohesive Law ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Energy Release Rates ◽  
Joining Process

Adhesive joints are largely employed nowadays as a fast and effective joining process. The respective techniques for strength prediction have also improved over the years. Cohesive Zone Models (CZM’s) coupled to Finite Element Method (FEM) analyses surpass the limitations of stress and fracture criteria and allow modelling damage. CZM’s require the energy release rates in tension (Gn) and shear (Gs) and respective fracture energies in tension (Gnc) and shear (Gsc). Additionally, the cohesive strengths (tn0 for tension and ts0 for shear) must also be defined. In this work, the influence of the CZM parameters of a triangular CZM used to model a thin adhesive layer is studied, to estimate their effect on the predictions. Some conclusions were drawn for the accuracy of the simulation results by variations of each one of these parameters.

Bond Thickness Effects upon Dynamic Behaviour in Adhesive Joints

2010 ◽  
Vol 97-101 ◽  
pp. 3920-3923 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Behaviour ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Response Functions ◽  
Frequency Range ◽  
Element Analysis ◽  
Cantilevered Beam ◽  
Different Thickness

The influence of adhesive layer thickness on the dynamic behaviour of the single-lap adhesive joints is investigated in this paper. The ABAQUS finite element analysis (FEA) software was used to predict the frequency response functions (FRFs) of the single-lap adhesive joints of different thickness of the adhesive layer. As a reference, the FRFs of a cantilevered beam without joint were investigated as well. It is clear that the FRFs of the four beams are close to each other within the frequency range 0~1000 Hz. It is also found that the composite damping of the single-lap adhesive joint increases as the thickness of the adhesive layer increases.

Study of mixed mode I/II cohesive zone models of different rank coals

2021 ◽  
Vol 246 ◽  
pp. 107611
Author(s):  
Jianfeng Yang ◽  
Haojie Lian ◽  
Vinh Phu Nguyen
Keyword(s):  
Cohesive Zone ◽  
Mixed Mode ◽  
Mode I ◽  
Cohesive Zone Models
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