Effect of adhesive thickness, adhesive type and scarf angle on the mechanical properties of scarf adhesive joints

Liao, Lijuan; Huang, Chenguang; Sawa, Toshiyuki

doi:10.1016/j.ijsolstr.2013.09.005

Cited by 104 publications

(57 citation statements)

References 39 publications

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“…The material of adherend was selected as mild steel, which was defined as the isotropic elastic model utilizing Young's modulus E=209GPa and Poisson's ratio ν=0.3. Owing to the adhesive layer with much lower stiffness compared with the adherend, the failure was assumed to initiate in the adhesive layer (cohesive failure) [4][5][6][7][9][10]. Accordingly, CZM in ABAQUS ® commercial code was adopted to describe the progressive damage based on triangle T-S law with mixed-mode [4][5][6].…”

Section: Numerical Modelmentioning

confidence: 99%

“…In addition, the influential factors to the joint failure can be divided into two categories, the stress state of the adhesive layer and mechanical properties of the adhesive [4][5][6]. For the interface stress state, it is decided by the geometrical configurations [2] and constraint effects [3] together.…”

Section: Introductionmentioning

confidence: 99%

“…In order to capture the progressive process for the joint failure, cohesive zone model (CZM) coupled with FEM was adopted widely to examine the mechanism of crack propagation until to the complete failure [3][4][5][6]. In CZM, the tractionseparation (T-S) curve governs the damage growth [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…In CZM, the tractionseparation (T-S) curve governs the damage growth [3][4][5][6][7][8]. Correspondingly, the cohesive strengths (σ u,I and σ u,II ) and critical fracture energies (G If and G IIf ) in mode I and mode II are the crucial parameters to decide the shape of T-S law.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, cohesive strength in mode II largely influences the results with a nearly proportional relation. Furthermore, Liao et al [5] also discussed the effects of influential parameters (adhesive thickness, adhesive type and scarf angle) on the loadbearing capacity of single scarf adhesive joint using dimensional analysis preliminarily. They concluded that the influential parameters affect the mechanical properties of the adhesive joint collectively but not individually.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Effect of Cohesive Parameters on Mixed-Mode Failure of Double-Scarf Adhesive Joint Subjected to Uniaxial Tensile Loadings

Liao

Huang

2015

Volume 2B: Advanced Manufacturing

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In the present study, the effects of cohesive parameters on the mixed-mode failure of double-scarf adhesive joint (DSAJ) subjected to uniaxial tensile loadings were examined and discussed numerically. For DSAJ with no perpendicular or parallel with the external loading direction, complex stress state (mixture of tensile and shear stresses) occurs at the adhesive interface. In addition, adhesive joint failure, which is a gradually process rather than a sudden transition, is accompanied by energy dissipates gradually at the crack tip. Correspondingly, cohesive zone model (CZM) coupled with finite element method (FEM) was implemented to verify the mechanism of crack from initiation to the complete failure. As the constitutive relation of the adhesive layer, the tractionseparation (T-S) law determines the interface damage evolution. Additionally, the shape of T-S curves in mode I and mode II are crucially decided by the cohesive strengths and critical fracture energies in each mode, respectively. Firstly, the nondimensional-normalized form of ultimate tensile loading of DSAJ was obtained using dimensional analysis. Then, three cases of cohesive parameters (case of constant anisotropy extent & case of constant critical fracture energy in each mode & case of constant cohesive strength in each mode) according to the non-dimensional-normalized form of adhesive properties were designed. Two types adhesives (brittle and ductile) were chosen to examine the effects of adhesive properties on the failure of DSAJ in this study. To avoid the influence of the geometries on DSAJ mechanical behaviors, the thickness of the adhesive layer and the scarf angle θ were held constantly, *Address all correspondence to this author.respectively. In numerical calculations, the change trends of the ultimate tensile loading (F u ), the failure energy (E f ) and the damage level (D) corresponding to F u with respect to the cohesive parameters were discussed. It can be observed the cohesive strengths in mode I and mode II codetermine F u of DSAJ with unequal rates. Moreover, E f of DSAJ, which is the necessary energy for the joint failure, is governed by the critical fracture energies in mode I and mode II with different contributions. Besides, it also obtained that the evolutions of D corresponding to F u of DSAJ with brittle and ductile adhesives are certain different. Generally, D of DSAJ with brittle adhesive is higher and more uneven than that of DSAJ with ductile adhesive. Accordingly, it can be concluded that DSAJ with brittle adhesive has lower ability to distribute the loading over a smaller cohesive zone with less uniform distribution. In addition, the numerical results revealed that with the increment of ratio in each case set in this paper, D of DSAJ does not rise obviously.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Effect of Cohesive Parameters on Mixed-Mode Failure of Double-Scarf Adhesive Joint Subjected to Uniaxial Tensile Loadings

Liao

Huang

2015

Volume 2B: Advanced Manufacturing

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Fracture Mechanics‐Based Design and Analysis of Structural Adhesive Joints

Luo

2020

Structural Adhesive Joints

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Long‐term performance of single‐lap joints: Review, challenges and prospects in civil engineering

Shu,

Qiang,

Jiang

et al. 2023

Engineering Reports

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Compared with traditional technology, bonding technology is more suitable for civil structure reinforcement because of its cost‐efficiency and superior mechanical properties. However, research on the long‐term performance of single‐lap joints (SLJs) requires better organization and comprehension. This article aims to investigate the long‐term performance and optimization design of SLJs. The main factors influencing the long‐term performance of SLJs from both material and component levels are discussed. The moisture diffusion mechanisms of bulk adhesives and the degradation mechanisms of SLJs are explored. Moreover, the optimization design of SLJs focuses on evaluating the overlap length, adhesive layer thicknesses, and changes in adhesives along the overlap length based on available literature. It is found that the applicability of diffusion models should be validated, and the selection of the models should consider working environments and types of adhesives. Exploring failure mechanisms and design criteria for the mixed SLJs in hygrothermal environments with/without sustained or alternating load is significant for the optimization design. This article indicates the limitations on the shear strength and long‐term performance of SLJs in available studies and provides insights into the challenges and prospects of their optimization design.

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Effect of adhesive thickness, adhesive type and scarf angle on the mechanical properties of scarf adhesive joints

Cited by 104 publications

References 39 publications

Numerical Analysis of Effect of Cohesive Parameters on Mixed-Mode Failure of Double-Scarf Adhesive Joint Subjected to Uniaxial Tensile Loadings

Numerical Analysis of Effect of Cohesive Parameters on Mixed-Mode Failure of Double-Scarf Adhesive Joint Subjected to Uniaxial Tensile Loadings

Fracture Mechanics‐Based Design and Analysis of Structural Adhesive Joints

Long‐term performance of single‐lap joints: Review, challenges and prospects in civil engineering

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