Strength analysis of metallic bonded joints containing defects

Xu, Wei; Wei, Yueguang

doi:10.1016/j.commatsci.2011.09.008

Cited by 39 publications

(10 citation statements)

References 38 publications

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“…As a result, the failure load increases as the adhesive gets thicker. Secondly, in practice, the amounts of defects such as micro-voids and micro-cracks are larger in the thicker adhesive layer, bonding capacity accordingly [42], whereas the present model doesn't consider the influence of defects. Lastly, the plastic dissipation is more rapid and the interface stress is larger in the thicker adhesive layer, making the adhesive layer vulnerable to failure.…”

Section: Discussionmentioning

confidence: 94%

Strength and interface failure mechanism of adhesive joints

Wei

2012

International Journal of Adhesion and Adhesives

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a b s t r a c tAdhesive joints have a wide range of applications in the civil engineering, automotive and aircraft industries. In the present research, we use the finite element method to systematically study the overall strength and interface failure mechanism of single lap joints, which are subjected to tensile loading, focusing on the effects of various system parameters including fracture energy of the adhesive layer, overlap length and adhesive layer thickness on the load-bearing capability of the joints. The results show that the overlap length and the adhesive fracture energy have combined influences on the load-bearing capability. On the other hand, a preliminary damage analysis of the adhesive layer is carried out, considering the situations when the loads arrive to the peak values. Furthermore, the interface behavior is investigated, including the interface stress analysis and interface slip. The rotation of the joint during loading and its influence factors are studied as well. Obtained results suggest that the interface stress distributions are related to the slip and the rotation angle.Crown

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Section: Discussionmentioning

confidence: 94%

Strength and interface failure mechanism of adhesive joints

Wei

2012

International Journal of Adhesion and Adhesives

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“…Therefore, the situations for other failure mode and crack path should be further investigated. Finally, in practice, the amounts of defects such as micro-voids and micro-cracks are larger in thicker adhesive layers, reducing the bonding capacity accordingly [32], whereas the present model does not consider the influence of the defects, just considering the cohesive parameters affected by the adhesive thickness. More sophisticated models are needed to study the combined effect of both the adhesive thickness and defects.…”

Section: Further Discussionmentioning

confidence: 99%

“…The metallic adherends are modeled as elastic-plastic solids, with their true stress-strain curves fitted using power-law hardening laws [11,32] …”

Section: Model Validationmentioning

confidence: 99%

Influence of adhesive thickness on local interface fracture and overall strength of metallic adhesive bonding structures

Wei

2013

International Journal of Adhesion and Adhesives

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a b s t r a c tAdhesive bonding structures are widely used in a variety of engineering fields. Their overall strength is dependent on the cohesive properties involving local interface fracture. In the present research, the influence of the adhesive thickness on the cohesive properties and the overall strength of metallic adhesive bonding structures are investigated, with the cohesive zone model employed to equivalently simulate the adhesive layers with various thicknesses. A theoretical approach has been developed to determine the cohesive parameters for the present model when the adhesive thickness is varied. And then some numerical examples are given to explore the adhesive thickness-dependence overall strength of the adhesive joints, followed by some comparisons with the existing experimental results. Furthermore, the variations of both the cohesive parameters and the overall strength with the various thicknesses are influenced by some intrinsic characteristics of adhesives, which are investigated finally. The results show that both the cohesive parameters and the overall strength of metallic adhesive bonding structures are much dependent on the adhesive thickness, and the variations of overall strength resulting from the various thicknesses have discrepancy due to the toughness and strain hardening capacity of adhesives.Crown

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“…For the mixed mode showed in Fig. 8(b), the maximum stress criterion was adopted to characterize the interfacial damage, which is described as [25] …”

Section: Interface Cohesive Modelmentioning

confidence: 99%