Finite element modelling of mode I delamination specimens by means of implicit and explicit solvers

Mollón, V.; Bonhomme, J.; Elmarakbi, Ahmed; Argüelles, A.; Viña, J.

doi:10.1016/j.polymertesting.2011.12.008

Cited by 19 publications

(8 citation statements)

References 25 publications

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“…Hence, the value of 410 6 MPa/mm was a good choice because it could be easily estimated using Equation (5). This was also in the similar range of the values generally used by researchers [22,29,30,35]. From the above parametric studies, the suggested cohesive parameters for accurate simulation with reasonable computational time were le = 0.5 mm, tu,III = 80 MPa, Dv = 110 -3 and kIII = 410 6 MPa/mm.…”

Section: Peak Load (N) Peak Load (N)mentioning

confidence: 76%

“…Thus, the initial estimation of kIII was 410 6 MPa/mm. This is in the similar range of the values generally used by researchers [22,29,30,35]. To study the effects of interface stiffness on the numerical force-displacement response, the range between 410 5 -410 8 MPa/mm was considered.…”

Section: Guidelines Of Cohesive Parameter Selectionmentioning

confidence: 97%

“…Based on the past studies using three-dimensional cohesive elements, researchers generally chose element size between 0.125-1 mm [29,30]. A larger range of 0.25-2.5 mm of mesh size was considered in this study for a reasonable computational time.…”

Section: Guidelines Of Cohesive Parameter Selectionmentioning

confidence: 99%

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Cohesive zone modelling of Mode III delamination using the edge crack torsion test

Israr¹,

Wong²,

Tamin³

2017

J. MECH. ENG. SCI.

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In the experimental studies of mode III delamination using the edge crack torsion test, the crack initiation and propagation measurement are always difficult. This information could be obtained through numerical modelling. The objective of this study is to propose a guideline to model mode III delamination behaviour using cohesive elements. Finite element models of an edge crack torsion specimen were developed based on the data from the literature. The delamination behaviour of the specimen along the pre-crack, which was located at the mid-thickness location, was modelled using cohesive elements. Through parametric studies, it was found that for reliable numerical modelling, a mesh size of 0.5 mm was suggested, which provided three elements in the cohesive zone. As for the interface strength, it was recommended to choose 80 MPa. In addition, a viscosity parameter of 110 -3 was found to be a good choice for reasonable computational time and converged numerical results. Besides, the interface stiffness was suggested to be 410 6 MPa/mm. Furthermore, the fracture process zone contour revealed that the delamination was started at a normalised location of approximately 0.7. Not only that, the fracture energy and strain distribution plots have shown the delamination was mode III dominated within the normalised distance of 0.34-0.86. The results from this study suggested that cohesive zone modelling is a useful method for the detailed analysis of the mode III delamination of an ECT specimen. The numerical modelling approach suggested from this study could be applied to ECT specimens at various different initial crack lengths. It also has the potential to be used to simulate the mode III delamination of other various types of laminated composites.

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Section: Peak Load (N) Peak Load (N)mentioning

confidence: 76%

Section: Guidelines Of Cohesive Parameter Selectionmentioning

confidence: 97%

See 1 more Smart Citation

Cohesive zone modelling of Mode III delamination using the edge crack torsion test

Israr¹,

Wong²,

Tamin³

2017

J. MECH. ENG. SCI.

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“…These parameters are chosen for illustration purpose. The bi-linear shape is chosen because this is the shape most commonly used in FEM when delamination is included [4,7,[34][35][36][37]. The value of the critical separation used in these simulations is much smaller than the value determined earlier from the experiments (here was about 3 mm), but is of the order of magnitude corresponding to the parameters describing the crack tip fracture energy.…”

Section: Numerical Approach and Resultsmentioning

confidence: 99%

Determination of a cohesive law for delamination modelling – Accounting for variation in crack opening and stress state across the test specimen width

Joki

Grytten

Hayman

et al. 2016

Composites Science and Technology

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“…To avoid interpenetration between the upper and lower arms, contact surfaces are defined at the adjacent surfaces of the interface using frictionless contact. An element thickness of 10 µm is used for the cohesive elements [ 15 , 23 ], which is also in the same order of the resin-rich region [ 24 ] and the Teflon thickness. The delamination zone is meshed with 0.1 mm element size, while the region outside the delamination zone is meshed with mesh size of 2 mm.…”

Section: Numerical Simulationmentioning

confidence: 99%

Moisture Absorption Effects on Mode II Delamination of Carbon/Epoxy Composites

et al. 2020

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It is necessary to consider the influence of moisture damage on the interlaminar fracture toughness for composite structures that are used for outdoor applications. However, the studies on the progressive variation of the fracture toughness as a function of moisture content M (%) is rather limited. In this regard, this study focuses on the characterization of mode II delamination of carbon/epoxy composites conditioned at 70 °C/85% relative humidity (RH). End-notched flexure test is conducted for specimens aged at various moisture absorption levels. Experimental results reveal that mode II fracture toughness degrades with the moisture content, with a maximum of 23% decrement. A residual property model is used to predict the variation of the fracture toughness with the moisture content. Through numerical simulations, it is found that the approaches used to estimate the lamina and cohesive properties are suitable to obtain reliable simulation results. In addition, the damage initiation is noticed during the early loading stage; however, the complete damage is only observed when the numerical peak load is achieved. Results from the present research could serve as guidelines to predict the residual properties and simulate the mode II delamination behavior under moisture attack.

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Finite element modelling of mode I delamination specimens by means of implicit and explicit solvers

Cited by 19 publications

References 25 publications

Cohesive zone modelling of Mode III delamination using the edge crack torsion test

Cohesive zone modelling of Mode III delamination using the edge crack torsion test

Determination of a cohesive law for delamination modelling – Accounting for variation in crack opening and stress state across the test specimen width

Moisture Absorption Effects on Mode II Delamination of Carbon/Epoxy Composites

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