A modified cohesive zone model for fatigue delamination in adhesive joints: Numerical and experimental investigations

Al-Azzawi, Ahmad; Kawashita, Luiz F.; Featherston, Carol Ann

doi:10.1016/j.compstruct.2019.111114

Cited by 22 publications

(16 citation statements)

References 44 publications

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“…Additionally, several authors have been simulated fatigue debonding under Mixed-Mode I+ II loading using Compact Tension-Shear (CTS) specimen, [172] Short Beam Shear (SBS) specimen, [173] a Mixed-Mode I+ II bending apparatus [174] and Cracked Lap Shear (CLS) specimen . [175] Furthermore, more recently, Al-Azzawi et al [176] performed numerical Figure 12. The modified bi-linear traction-separation law for fatigue load [163] .…”

Section: Theory and Applicationmentioning

confidence: 99%

A review on failure theories and simulation models for adhesive joints

Τσερπές

Barroso-Caro

Carraro

et al. 2021

The Journal of Adhesion

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In the framework of the Cost Action CERTBOND (Reliable roadmap for certification of bonded primary structures), a wide group of researchers from 27 European Countries have had the opportunity to work on the topic of certification of bonded joints for primary structural applications from different engineering sectors such as the aerospace, automotive, civil engineering, wind energy and marine sectors. Since virtual testing and optimization are basic tools in the certification process, one of the key objectives of CERTBOND is to critically review some of the available models and failure theories for adhesive joints. The present paper summarizes the outcome of this task. Nine different models/theories are described in detail. Specifically, reviewed are the Classical Analytical Methods, the Process Zone Methods, Linear Elastic Fracture Mechanics (LEFM), the Virtual Crack Closure Technique (VCCT), the Stress Singularity Approach, Finite Fracture Mechanics (FFM), the Cohesive Zone Method (CZM), the Progressive Damage Modeling method and the Probabilistic methods. Also, at the end of the paper, the modeling of temperature effects on adhesive joints have been addressed. For each model/theory, information on the methodology, the required input, the main results, the advantages and disadvantages and the applications are given.

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Section: Theory and Applicationmentioning

confidence: 99%

A review on failure theories and simulation models for adhesive joints

Τσερπές

Barroso-Caro

Carraro

et al. 2021

The Journal of Adhesion

View full text Add to dashboard Cite

show abstract

“…The third state, known as the damaged state, has a damage parameter 0 < 𝐷 < 1. The damage variable is determined based on strain energy release rate and given based on power law relation by the following softening expression [40]:…”

Section: Modified Cohesive Zone Modelmentioning

confidence: 99%

“…This equation has been modified here to include both friction and enhanced shear strength (F-S/CZM). Furthermore, a novel mode-II constitutive behaviour model based on the trapezoidal CZM developed by the authors [40] is utilised instead of the conventional bilinear CZM. This was found to be more suitable for simulating the elastic-plastic behaviour of toughened adhesive interfaces for composite structures with a detailed discussion on this reported in [40].…”

Section: Modified Cohesive Zone Modelmentioning

confidence: 99%

“…Furthermore, a novel mode-II constitutive behaviour model based on the trapezoidal CZM developed by the authors [40] is utilised instead of the conventional bilinear CZM. This was found to be more suitable for simulating the elastic-plastic behaviour of toughened adhesive interfaces for composite structures with a detailed discussion on this reported in [40]. From the conventional traction-separation law, the relationship between the maximum value of traction or stress and the separation or displacement can be described by:…”

Section: Modified Cohesive Zone Modelmentioning

confidence: 99%

“…Figure 9. Constitutive behaviour of trapezoidal based CZM reported by the author in[40] and with enhanced mode-II properties new model (F-S/CZM).…”

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confidence: 91%

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Predicting interlaminar damage behaviour of fibre-metal laminates containing adhesive joints under bending loads

Al-Azzawi

Kawashita

Featherston

2021

Journal of Reinforced Plastics and Composites

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This study includes experimental and numerical investigations on fibre-metal laminate structures containing adhesive joints under static bending loads. Experimental tests were carried out on Glare® 4B specimens manufactured in-house and containing doubler joint features. Numerical analyses were performed using Abaqus software including damage in the glass fibre reinforced polymer layers, ductile damage in the resin pockets (FM94 epoxy) and plasticity in the metal layers. A new cohesive zone model coupling friction and interfacial shear under through-thickness compressive stress has been developed to simulate delamination initiation and growth at the metal/fibre interfaces with the adhesive joint under flexural loading. This model is implemented through a user-defined VUMAT subroutine in the Abaqus/Explicit software and includes two main approaches, firstly, combining friction and interfacial shear stresses created in the interlaminar layers of the fibre-metal laminate as a result of through-thickness stresses and secondly, considering elastic-plastic damage behaviour using a new cohesive zone model based on the trapezoidal law (which provides more accurate results for the simulation of toughened epoxy matrices than the commonly used bilinear cohesive zone model). Numerical results have been validated against experimental data from 4-point bending tests and a good correlation observed with respect to both crack initiation and evolution. Delamination and shear failure were noted to be the predominant failure modes under bending stresses as expected. This is due to the higher mode-II stresses introduced during bending which cause different damage evolution behaviour to that seen for axial stresses. Finite element results revealed that both friction and shear strength parameters generated from through-thickness compression stresses have a significant effect in predicting damage in fibre-metal laminate structures under this type of loading.

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