Predicting the crushing behaviour of composite material using high-fidelity finite element modelling

Tan, Wei; Falzon, Brian; Price, Mark

doi:10.1080/13588265.2014.972122

Cited by 58 publications

(36 citation statements)

References 47 publications

(62 reference statements)

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“…The final intralaminar ply failure consists of fibre breakage and matrix cracking due to the combination of bending, compression and shear. Similar observations have also been presented by Isar et al [21], Tan et al [19] and Grauers et al [22].…”

Section: Typical Damage Modessupporting

confidence: 79%

“…Therefore, an accurate description of non-linear shear behaviour is required. Base on the damage model presented in [15][16][17][18][19], the failure criteria and damage model is briefly described below, incorporating the new non-linear shear model.…”

Section: Intralaminar Damage Modelmentioning

confidence: 99%

“…A composites damage model based on fracture and continuum damage mechanics, has been developed by Falzon's research group, initially for predicting low-velocity impact damage [15][16][17] and compression after impact strength [18] and was subsequently used to capture crushing behaviour, validated using experimental data from wedge-shape specimens [19]. This computational model assumed that the shear modulus remained constant under shear loading.…”

Section: Introductionmentioning

confidence: 99%

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Modelling the crush behaviour of thermoplastic composites

Tan

Falzon

2016

Composites Science and Technology

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Thermoplastic composites are likely to emerge as the preferred solution for meeting the high-volume production demands of passenger road vehicles. Substantial effort is currently being directed towards the development of new modelling techniques to reduce the extent of costly and time consuming physical testing. Developing a high-fidelity numerical model to predict the crush behaviour of composite laminates is dependent on the accurate measurement of material properties as well as a thorough understanding of damage mechanisms associated with crush events. This paper details the manufacture, testing and modelling of self-supporting corrugated-shaped thermoplastic composite specimens for crashworthiness assessment. These specimens demonstrated a 57.3% higher specific energy absorption compared to identical specimen made from thermoset composites. The corresponding damage mechanisms were investigated in-situ using digital microscopy and post analysed using Scanning Electron Microscopy (SEM). Splaying and fragmentation modes were the 2 primary failure modes involving fibre breakage, matrix cracking and delamination. A mesoscale composite damage model, with new non-linear shear constitutive laws, which combines a range of novel techniques to accurately capture the material response under crushing, is presented. The force-displacement curves, damage parameter maps and dissipated energy, obtained from the numerical analysis, are shown to be in a good qualitative and quantitative agreement with experimental results. The proposed approach could significantly reduce the extent of physical testing required in the development of crashworthy structures.

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Section: Typical Damage Modessupporting

confidence: 79%

Section: Intralaminar Damage Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling the crush behaviour of thermoplastic composites

Tan

Falzon

2016

Composites Science and Technology

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“…Queen's University Belfast This paper will focus on recent developments in addressing the challenge of developing a mesoscale finite element based damage model, which builds on the work of Falzon's research group [5,6,7,8,9], for predicting impact damage, residual strength and energy absorption capacity of carbon fibre composites structures.…”

Section: Brian Falzon and Wei Tanmentioning

confidence: 99%

“…According to plastic-damage theories, the plastic strain represents all irreversible deformations including those caused by matrix microcracks. The shear strain γ ij was decomposed into the elastic part γ ij,el and the inelastic/plastic part γ ij,in , (4) The elastic strain is given by, (5) The stress-strain constitutive laws are represented by an exponential function, (6) where is the initial yield strength, determined by the 0.2% offset strain point.…”

Section: Intralaminar Damage Modelmentioning

confidence: 99%

Predicting Impact Damage, Residual Strength and Crashworthiness of Composite Structures

Falzon

Tan

2016

SAE Int. J. Mater. Manf.

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The development of the latest generation of wide-body carbon-fibre composite passenger aircraft has heralded a new era in the utilisation of these materials. The premise of superior specific strength and stiffness, corrosion and fatigue resistance, is tempered by high development costs, slow production rates and lengthy and expensive certification programmes. Substantial effort is currently being directed towards the development of new modelling and simulation tools, at all levels of the development cycle, to mitigate these shortcomings. One of the primary challenges is to reduce the extent of physical testing, in the certification process, by adopting a 'certification by simulation' approach. In essence, this aspirational objective requires the ability to reliably predict the evolution and progression of damage in composites. The aerospace industry has been at the forefront of developing advanced composites modelling tools. As the automotive industry transitions towards the increased use of composites in mass-produced vehicles, similar challenges in the modelling of composites will need to be addressed, particularly in the reliable prediction of crashworthiness. While thermoset composites have dominated the aerospace industry, thermoplastics composites are likely to emerge as the preferred solution for meeting the high-volume production demands of passenger road vehicles. This keynote paper outlines recent progress and current challenges in the development of finite-element-based predictive modelling tools for capturing impact damage, residual strength and energy absorption capacity of thermoset and thermoplastic composites for crashworthiness assessments.

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Adaptive modelling of delamination initiation and propagation using an equivalent single‐layer shell approach

Främby

Fagerström

Brouzoulis

2017

Numerical Meth Engineering

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A major challenge for crash failure analysis of laminated composites is to find a modelling approach, which is both sufficiently accurate, for example, able to capture delaminations, and computationally efficient to allow full-scale vehicle crash simulations. Addressing this challenge, we propose a methodology based on an equivalent single-layer shell formulation which is adaptively through-the-thickness refined to capture initiating and propagating delaminations. To be specific, single shell elements through the laminate thickness are locally and adaptively enriched using the extended finite element method such that delaminations can be explicitly modelled without having to be represented by separate elements. Furthermore, the shell formulation is combined with a stress recovery technique which increases the accuracy of predicting delamination initiations. The paper focuses on the parameters associated with identifying, introducing and extending the enrichment areas; especially on the impact of these parameters on the resulting structural deformation behaviour. We conclude that the delamination enrichment must be large enough to allow the fracture process to be accurately resolved, and we propose a suitable approach to achieve this. The proposed methodology for adaptive delamination modelling shows potential for being computationally efficient, and thereby, it has the potential to enable efficient and accurate full vehicle crash simulations of laminated composites. § We acknowledge that this work only considers parameters to model mode I delamination; however, we will consider these guidelines also for mode II delamination modelling.

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Predicting the crushing behaviour of composite material using high-fidelity finite element modelling

Cited by 58 publications

References 47 publications

Modelling the crush behaviour of thermoplastic composites

Modelling the crush behaviour of thermoplastic composites

Predicting Impact Damage, Residual Strength and Crashworthiness of Composite Structures

Adaptive modelling of delamination initiation and propagation using an equivalent single‐layer shell approach

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