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.

scholarly journals Investigation of Defect Effects on Adhesively Bonded Joint Strength Using Cohesive Zone Modeling

2018 ◽  
Vol 68 (3) ◽  
pp. 5-24
Author(s):  
Jamal-Omidi Majid ◽  
Mohammadi Suki Mohammad Reza
Keyword(s):  
Material Properties ◽  
Cohesive Zone ◽  
Joint Strength ◽  
Adhesive Layer ◽  
Cohesive Zone Modeling ◽  
Adhesively Bonded ◽  
Bonded Joint ◽  
Degraded Material ◽  
Zone Modeling ◽  
Adhesively Bonded Joint

AbstractIn this paper, effects of the defect in an adhesively bonded joint have been investigated using cohesive zone modeling. Consequently, a 3D finite element model of a single lap-joint is constructed and validated with experiments. Strength prediction of current model is found desirable. Accordingly, different sizes of square shape defects are imported to model in the form of changing (raised or degraded) material properties (heterogeneity) and locally delaminated areas (as inclusion/void), respectively. Joint strength is investigated and a stress analysis is carried out for adhesive layer and adherends. Obtained Results show that, defect has significant impact on the results. It is found that at constant size of defect, local delamination has more impact on bonded joint strength than the heterogeneity. Furthermore, stress analyses demonstrate that the stress field does not change in adherends by taking defects into account. However, stress values decrease with degraded material properties and joint’s strength. Through evaluation of peel and transverse shear stresses in adhesive layer it is found that there is a change of stress distribution for both types of defects. Whereas, there is a considerable stress concentration in the delaminated adhesive layer.

Fracture Characteristics of Shear Adhesive Dissimilar Joint

2014 ◽  
Vol 606 ◽  
pp. 165-169
Author(s):  
Mohd Afendi ◽  
Ku Hafizan ◽  
M.S. Abdul Majid ◽  
R. Daud ◽  
N.A.M. Amin ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Interface Crack ◽  
Adhesive Joint ◽  
Adhesive Layer ◽  
Stress Distributions ◽  
Adhesively Bonded ◽  
Shear Joint ◽  
Bonded Joint ◽  
Adhesively Bonded Joint

In this study, the effect of bond thickness upon shear strength and fracture toughness of epoxy adhesively bonded joint with dissimilar adherents was addressed. The bond thickness, t between the adherents was controlled to be ranged between 0.1 mm and 1.2 mm. Finite element analyses were also executed by commercial ANSYS 11 code to investigate the stress distributions within the adhesive layer of adhesive joint. As a result, shear strength of adhesive joint reduces with increasing bond thickness. The strength of shear adhesive joint was also depended on elastic modulus of adherent. Moreover, the failure of dissimilar adherents bonded shear joint originated at a location with critical stress-y which was the interface corner of ALYH75/epoxy. In the case of shear adhesive joint with an interface crack, the fracture also occurred at the ALYH75/epoxy interface even in the steel-adhesive-aluminum (SEA) specimens. Fracture toughness, Jc of aluminum-adhesive-steel (AES) joints was similar to those of SES and demonstrates strong dependency upon bond thickness. Furthermore, the interface crack in SEA specimen has relatively large fracture resistance if compared to those in AES specimen. Finally, Kc fracture criterion was found to be appropriate for shear adhesive joints associated with adhesive fracture.

Normal Stress Distributions in a Single-Lap Adhesively Bonded Joint under Tension

2012 ◽  
Vol 530 ◽  
pp. 9-13 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Normal Stress ◽  
High Stress ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Normal Stress Distribution ◽  
Bonded Joint ◽  
Adhesively Bonded Joint

This paper investigates normal stress distribution of a single-lap adhesively bonded joint under tension using the three-dimensional finite element methods. Five layers of solid elements were used across the adhesive layer thickness in order to obtain an accurate indication of the variation of normal stress. All the numerical results obtained from the finite element analysis show that the spatial distribution of normal stress are similar for different interfaces though the stress values are obviously different. It can also be seen from the results that the left hand region, which is very close to the left free end of the adhesive layer, is subjected to very high stress and the magnitude of the normal stress oscillates in value close to the left end of the adhesive layer.

Three-Dimensional Non-Linear FE Analysis of Shear Stress Distributions in Adhesively Bonded Joint

2014 ◽  
Vol 893 ◽  
pp. 690-693 ◽  
Author(s):  
Xiao Cong He ◽  
Yu Qi Wang
Keyword(s):  
Shear Stress ◽  
Stress Component ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Stress Distributions ◽  
Adhesively Bonded ◽  
Bonded Joint ◽  
Stress Components ◽  
Non Linear ◽  
Adhesively Bonded Joint

The aim of this work is to investigate the shear stress distributions across the adhesive layer thickness in single-lap adhesively bonded joint. The shear stress distributions of a single-lap adhesively bonded joint have been investigated using the three-dimensional linear static and non-linear quasi-static finite element method. The analysis results indicate that there are significant differences between the linear static and non-linear quasi-static analyses. The results also show that the maximum value of the shear stress component S13occurs at the centre line while the maximum of the shear stress components S12and S23occur near or at the left-rear corner of the adhesive layer.

Numerical Study of Transverse Impact Response of Single-Lap Adhesively Bonded Joint

2012 ◽  
Vol 217-219 ◽  
pp. 2154-2158 ◽  
Author(s):  
Jian Guang Zhang ◽  
Zhen Zhang ◽  
De Quan Ma ◽  
Yong Hai Wen ◽  
Shao Bo Gong ◽  
...  
Keyword(s):  
Numerical Study ◽  
Adhesive Layer ◽  
Element Model ◽  
Cohesive Failure ◽  
Transverse Impact ◽  
Adhesively Bonded ◽  
Bonded Joint ◽  
Length Direction ◽  
Peel Stress ◽  
Adhesively Bonded Joint

The response of adhesively bonded lap-joint under transverse impact was investigated by means of DYTRAN software. A finite element model was developed based on cohesive failure in the adhesive layer of the joint. It was found that transverse impact results in shear and peel stress concentration in the adhesive due to the considerable deflection of the joint. The stress distribution in the adhesive layer was asymmetric along the overlap length direction. The peel stress varies from tensile to compressive from one side to the other. Two cracks initiated at two sides of the adhesive layer were observed before the failure of the joint.

Automotive Structures: Design for Disassembly and the Role of Adhesive Bonding

2013 ◽  
Vol 765 ◽  
pp. 721-725 ◽  
Author(s):  
Allan Hutchinson ◽  
Patricia H. Winfield ◽  
Denise Morrey
Keyword(s):  
Adhesive Bonding ◽  
Adhesively Bonded ◽  
Foaming Agents ◽  
Material Recovery ◽  
Volumetric Expansion ◽  
Functional Additives ◽  
Bonded Joint ◽  
The Matrix ◽  
Adhesively Bonded Joint

A controllable adhesive disbonding mechanism can be achieved by activating functional additives located within the matrix of an adhesively bonded joint. This action facilitates the disassembly and material recovery from structurally bonded assemblies. The engineering capabilities of bonded joints containing a range of physical foaming agents were investigated. The effect of the physical foaming agents on joint disassembly was mostly attributable to the volumetric expansion efficiency of the additive whilst constrained within an adhesive matrix.

Torsional Stiffness Verification of an Adhesively Bonded Joint

2010 ◽  
Author(s):  
A. Annicchiarico ◽  
F. Caputo ◽  
G. De Angelis ◽  
F. Frascà ◽  
G. Lamanna ◽  
...  
Keyword(s):  
Torsional Stiffness ◽  
Adhesively Bonded ◽  
Bonded Joint ◽  
Adhesively Bonded Joint

scholarly journals Analysis of production parameters of single-lap bonds adhesive bonded with composites based on aluminium filler 

2017 ◽  
Vol 63 (No. 1) ◽  
pp. 36-44 ◽  
Author(s):  
Müller Miroslav
Keyword(s):  
Adhesive Bonding ◽  
Epoxy Adhesive ◽  
Polymer Particle ◽  
Material Strength ◽  
Adhesively Bonded ◽  
Metal Sheets ◽  
Bonded Joint ◽  
Negative Effect ◽  
Adhesively Bonded Joint ◽  
Agricultural Machines

In the area of bonding of sheets of metals, mainly in construction of transport and agricultural machines, single-lap bonds are used. In manufacturing corporations focused on bonding of the metal sheets the technologies such as riveting, welding and adhesive bonding are particularly used. These methods are frequently combined. The aim of the research was the evaluation of lap length of alloy AlCu4Mg adhesively bonded using two component epoxy adhesive, which is commonly used in construction of machines and its modification based in addition of filler in form of aluminium microparticles. The secondary aim of the research was to ascertain the influence of microparticle volume of aluminium filler on mechanical properties of polymer particle composite. Strength of adhesively bonded joint depends on the thickness of the bonded material. Strength of the adhesively bonded joint is dependent on the lapping length of adhesively bonded material. The highest values of strength of adhesively bonded joint were reached with the coefficient of the proportional length 0.27 ± 0.01. The assumption about negative effect of filler on tensile strength during the experiments was not confirmed. 

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