Modelling and simulation methodology for unidirectional composite laminates in a Virtual Test Lab framework

Falcó, O.; Ávila, R.L.; Tijs, B.H.A.H.; Lopes, C.S.

doi:10.1016/j.compstruct.2018.02.016

Cited by 100 publications

(63 citation statements)

References 50 publications

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“…This is reflected in the following approximate percentage ratios of plies in the 0, Tables 1 and 2 respectively. Table 2: Average AS4/8552 ply material properties (taken from [32]). [35][36][37].…”

Section: Test Specimensmentioning

confidence: 99%

“…FE modelling of the composite coupons were carried out in Abaqus/Explicit [40], following the methodology proposed in [28] and briefly described as follows. The virtual standard coupons were split into parts employing different discretization levels, and whose kinematic compatibility was ensured by means of tie constraints, as proposed earlier by the authors [32] The mesh generation was governed by mesh alignment with orthotropic material directions and directional biasing (mesh ratio of 3 to 1), as proposed in [32]. Moreover, the mesh regularization approach proposed by Baẑant and Oh [47] was employed to ensure the proper computation of the crack energy release rate for each damage mode.…”

Section: Modelling Approachmentioning

confidence: 99%

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An efficient numerical approach to the prediction of laminate tolerance to Barely Visible Impact Damage

Baluch¹,

Falcó²,

Ubago-Jiménez³

et al. 2019

Composite Structures

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An efficient numerical approach for the prediction of the Compression After Impact (CAI) strength of aerospace-grade CFRP laminates when exposed to Barely Visible Impact Damage (BVID) is proposed. The approach is based on mapping relevant BVID features, i.e. delaminations, onto an efficient CAI finite element model based on continuum shell discretization, and can be used on Low-Velocity Impact (LVI) results obtained experimentally or by means of high-fidelity virtual tests. It is proposed that delaminations may be represented by simplified shapes, and only the ones at critical throughthickness locations need to be mapped, allowing the clustering of several plies in a single shell layer. General guidelines, that are potentially valid for a wide range of unidirectional CFRP laminates, are proposed to identify relevant and critical BVID features to be mapped onto the efficient CAI modelling. The approach was validated for five laminates of AS4/8552 material, covering a range of different thicknesses, overall achieving CAI strength predictions within 5% of the experimental results. In comparison with the alternative high-fidelity CAI virtual testing approach, this method leads to computational efficiency gains of an order of magnitude. Moreover, the full simulation of the sequence LVI plus CAI steps can be accelerated by a factor of four.

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Section: Test Specimensmentioning

confidence: 99%

Section: Modelling Approachmentioning

confidence: 99%

An efficient numerical approach to the prediction of laminate tolerance to Barely Visible Impact Damage

Baluch¹,

Falcó²,

Ubago-Jiménez³

et al. 2019

Composite Structures

View full text Add to dashboard Cite

show abstract

“…The standard test methods can be modelled with high-fidelity and accurate predictions of laminate behaviour and relevant properties achieved, as demonstrated by Falcó et al [20]. Both physical and virtual approaches aim at reproducing a macroscopically homogeneous stress state such that the resultant behaviour can be considered intrinsic to the laminate configuration.…”

Section: Mesomechanical Homogenizationmentioning

confidence: 99%

“…To capture the relevant mechanisms of laminate behaviour, the RLE domain is discretized in plies and ply interfaces. The laminate modelling approach follows the work of Falcó et al [20]. Accordingly, the ply interface response is modelled by means of a general mixedmode cohesive zone method coupled with frictional behaviour.…”

Section: Mesomechanical Homogenizationmentioning

confidence: 99%

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Special-purpose elements to impose Periodic Boundary Conditions for multiscale computational homogenization of composite materials with the explicit Finite Element Method

Sádaba

Herráez

Naya

et al. 2019

Composite Structures

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A novel methodology is presented to introduce Periodic Boundary Conditions (PBC) on periodic Representative Volume Elements (RVE) in Finite Element (FE) solvers based on dynamic explicit time integration. This implementation aims at overcoming the difficulties of the explicit FE method in dealing with standard PBC. The proposed approach is based on the implementation of a user-defined element, named a Periodic Boundary Condition Element (PBCE), that enforces the periodicity between periodic nodes through a spring-mass-dashpot system. The methodology is demonstrated in the multiscale simulation of composite materials. Two showcases are presented: one at the scale of computational micromechanics, and another one at the level of computational mesomechanics. The first case demonstrates that the proposed PBCE allows the homogenization of composite ply properties through the explicit FE method with increased efficiency and similar reliability with respect to the equivalent implicit simulations with traditional PBC. The second case demonstrates that the PBCE coupled with Periodic Laminate Elements (PLE) can effectively be applied to the computational homogenization of elastic and strength properties of entire laminates taking into account highly nonlinear effects. Both cases motivate the application of

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Investigation on the effect of stacking order and hybridization on mechanical and water absorption properties of woven flax/bamboo composites

2022

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In virtue of the performance of natural fiber reinforced composites, hybridization and stacking order play a crucial role in defining the behavior of engineering components. Furthermore, no studies have been reported on the mechanical and water absorption properties of woven flax/bamboo hybrid composites with different stackings. The present study investigates the influence of stacking sequences and hybridization of flax (F)/bamboo (B) epoxy composites on its mechanical and water absorption properties. The stacking sequence is varied as follows: B/F/F/B, F/B/B/F, F/B/F/B, F/F/B/B. A numerical model for interlaminar shear strength (ILSS) is developed and validated using ANSYS composite repost, which can predict the critical stresses and damage in each ply, as it is not possible through experimental studies. The tensile fractured surfaces are examined by scanning electron microscopy. Results indicate that the mechanical and water absorption of hybrid composite laminates are influenced by the stacking sequence. The optimum stacking order with maximum performance is obtained for B/F/F/B. The increase in tensile, flexural, impact, and ILSS values is observed as 8.3%, 25%, 4.4%, and 14.6%, respectively. The water diffusion coefficient is reduced by 34.75% by the addition of the bamboo layer to the skin. The computational analysis predicted the different modes of critical stresses and failures acting on each ply during the ILSS test.

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Modelling and simulation methodology for unidirectional composite laminates in a Virtual Test Lab framework

Cited by 100 publications

References 50 publications

An efficient numerical approach to the prediction of laminate tolerance to Barely Visible Impact Damage

An efficient numerical approach to the prediction of laminate tolerance to Barely Visible Impact Damage

Special-purpose elements to impose Periodic Boundary Conditions for multiscale computational homogenization of composite materials with the explicit Finite Element Method

Investigation on the effect of stacking order and hybridization on mechanical and water absorption properties of woven flax/bamboo composites

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