A finite element study of fatigue crack propagation in single lap bonded joint with process-induced disbond

Liu, Yiding; Lemanski, Stuart; Zhang, Xiang; Ayre, David; Nezhad, Hamed Yazdani

doi:10.1016/j.ijadhadh.2018.10.005

Cited by 26 publications

(21 citation statements)

References 19 publications

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“…In Figure 13(b), fatigue debonding growth from semi-circular disbond had already propagated to reach the free edges and formed a 5 mm strip disbond (similar to the initial disbond shape in the narrow width coupon joints). Compared with fatigue debonding in the "coupon" joints studied in [25], it can be found that apart from this initial fatigue cycles, fatigue debonding life of the coupon joint and wider joint do not show much difference. However, coupon joints would provide a very conservative fatigue life prediction (almost one-fourth of that of the wider joint) under the same fatigue crack growth rate (as both joints are bonded by the same adhesive).…”

Section: Discussionmentioning

confidence: 87%

“…Discussion on the importance of using an appropriate governing parameter was made in a previous study by the author [25]. In this current study, a normalised parameter, g max , is used as defined in Eq.…”

Section: Fractographymentioning

confidence: 99%

“…Fatigue crack growth life prediction in (a) Phase i (crack configuration a 1 ) and (b) Phase iii (crack configuration a 2 ), and comparison with test results and conventional coupon joint (adhesion failure)[25].…”

mentioning

confidence: 99%

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Experimental and numerical study of process-induced defects and their effect on fatigue debonding in composite joints

Liu

Zhang

Lemanski

et al. 2019

International Journal of Fatigue

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Laboratory coupon joints for fatigue debonding tests usually have narrow width and a through-width initial disbond. However, realistic structural joints are much wider and may contain process-induced defects and accidental damage; both are much smaller than the joint width. Small and discrete damage may behave differently from the idealised through-width disbond crack. This has brought a question on whether the laboratory coupon joint can accurately represent the fatigue behaviour of wider structural joints. This paper presents an experimental and numerical study of fatigue behaviour of a wide bonded lap joint with a process-induced defect of semi-circular shape. Fatigue debonding propagation was monitored by ultrasound inspection. Fatigue life was predicted using a normalised strain energy release rate parameter calculated by finite element method, and the adhesive material fatigue crack growth rate data measured under single and mixed mode conditions. Simulation of processinduced defect and validation by experiments have brought a better understanding of fatigue debonding behaviour in wide joints containing realistic damage. Suggestions are given for fatigue fracture tests of bonded joints.

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Section: Discussionmentioning

confidence: 87%

Section: Fractographymentioning

confidence: 99%

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Experimental and numerical study of process-induced defects and their effect on fatigue debonding in composite joints

Liu

Zhang

Lemanski

et al. 2019

International Journal of Fatigue

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“…Moreover, unknown variables in the solution domain are expressed by approximate functions. Many researchers have employed FEM to solve fracture problems [10], including fatigue crack growth [11][12][13] in engineering structures. Chen et al studied the impact of incision angle and depth on the strength [14] and crack propagation [15] of zirconia ceramic.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Prediction of the Zirconia Fixture Based on Boundary Element Method

Wang

et al. 2020

Shock and Vibration

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Zirconia grinding fixtures have been widely used in semiconductor industry to improve the quality and precision of the products. For maximizing the service life and minimizing the risks of accidental damage, it is critical to have a better understanding of the fatigue life of zirconia grinding fixtures. To this end, a boundary element method is developed in this paper to investigate their crack growth and fatigue life. To validate the proposed method, the stress intensity factor of a typical plate structure with initial cracks is considered. On this basis, Paris Law is employed in the boundary element model to further study the crack growth and stress distributions in the zirconia fixture under cyclic loads. Numerical results show that stress concentration occurs at the pillar of the fixture, and crack growth is perpendicular to the loading direction.

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“…The model is two‐dimensional, and it is assumed that crack growth is confined to a straight bond line. In a recent work, Liu et al presented a method for predicting fatigue crack propagation in adhesive bonded composite joints with an initial full‐width disbond using finite element analysis and numerical integration of the material's fatigue crack growth rate law. The crack growth was modelled using a fracture mechanics criterion considering two different crack propagation patterns.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth simulation in adhesively bonded composite joints

Τσερπές

Floros

2018

Fatigue Fract Eng Mat Struct

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A numerical model has been developed for simulating fatigue crack growth (debonding) in adhesively bonded composite joints subjected to mode‐I, mode‐II, and mixed‐mode I + II loading conditions. The model employs a cohesive zone model described by a modified bilinear traction‐separation law. Fatigue damage in the composite adherends is not considered in the model. To account for crack divergence and reduce sensitivity of numerical results on mesh density, a crack front detection algorithm based on the effective element's length was employed. The model is implemented as a user‐defined subroutine (UMAT) in the commercial FE code LS‐DYNA. The model's input parameters, in the form of a modified Paris law, and the validation data were obtained from experimental tests conducted by the authors. It was found that the model is able to successfully simulate crack growth in the regime of the experimental data.

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A finite element study of fatigue crack propagation in single lap bonded joint with process-induced disbond

Cited by 26 publications

References 19 publications

Experimental and numerical study of process-induced defects and their effect on fatigue debonding in composite joints

Experimental and numerical study of process-induced defects and their effect on fatigue debonding in composite joints

Fatigue Life Prediction of the Zirconia Fixture Based on Boundary Element Method

Fatigue crack growth simulation in adhesively bonded composite joints

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