Discrete element modelling of unidirectional fibre-reinforced polymers under transverse tension

Ismail, Yaser; Sheng, Yong; Yang, Dongmin; Ye, Jianqiao

doi:10.1016/j.compositesb.2014.12.024

Cited by 66 publications

(36 citation statements)

References 31 publications

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“…In this section an algorithm is developed in DEM to generate random distributions of fibres with high volume fractions, which improves the previous one proposed by the authors in [16] by combining experimental and shaking approaches.…”

Section: Algorithm Development Using Demmentioning

confidence: 99%

Discrete element method for generating random fibre distributions in micromechanical models of fibre reinforced composite laminates

Ismail

Yang

2016

Composites Part B: Engineering

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A new approach is presented for generating random distribution of fibres in the representative volume element (RVE) of fibre reinforced composite laminates. The approach is based on discrete element method (DEM) and experimental data of fibre diameter distribution. It overcomes the jamming limit appeared in previous methods and is capable of generating high volume fractions of fibres with random distributions and any specified inter-fibre distances. Statistical analysis is then carried out on the fibre distributions generated within the RVEs, which show good agreement with experiments in all statistics analysed. The effective elastic properties of the generated RVEs are finally analysed by finite element method, which results show more reasonable agreement with the experimental results than previous methods.

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Section: Algorithm Development Using Demmentioning

confidence: 99%

Discrete element method for generating random fibre distributions in micromechanical models of fibre reinforced composite laminates

Ismail

Yang

2016

Composites Part B: Engineering

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“…The aspect ratio 10 randomly distributed and single fiber structures were compared with those of [9] and showed similar trends. Though both studies examined polymerceramic and ceramic-ceramic structures with the same materials, the combinations of materials were different so an exact verification could not be made.…”

Section: Resultsmentioning

confidence: 99%

“…Square fibers were also compared with Kar Gupta and Venkatesh [9]. The aspect ratio 10 randomly distributed and single fiber structures were compared with those of [9] and showed similar trends.…”

Section: Resultsmentioning

confidence: 99%

Effects of unit-cell boundary type on the electromechanical properties of randomly distributed multifunctional composite structures

Martin¹,

Challagulla²

2018

EasyChair Preprints

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Abstract-The unit-cell composition of three-dimensional finite element models for 3-0 and 3-1 type polymer (PVDF) -ceramic (BaTiO3) and ceramic (PZT-7A) -ceramic (BaTiO3) structures are compared to determine the effects of fiber interaction at the surface of the unit-cell on the effective elastic, piezoelectric and dielectric properties of the multifunctional composite systems. The first unit-cell type examined has enclosed fibers that are completely contained within its boundaries, the second type has fibers that are contained within the sides of the unit-cell but can be cut at the top and bottom surfaces, and the third type has fibers that can be cut on the top, bottom and side surfaces of the unit-cell. All cut fibers are matched on opposing surfaces for continuity. Randomly distributed and aligned circular fibers, randomly distributed and randomly oriented circular fibers, and one central enclosed fiber with varying volume fractions and aspect ratios are compared with these three unit-cell structures. Results show that fiber models display greater or equal values of C "" when compared to aligned or randomly oriented fibers for all cases except aspect ratio 1 polymer-ceramic structures. The third type of unit-cell shows the highest e "" values for single, aligned and randomly oriented fiber structures, except for the aspect ratio 10 polymerceramic case where the second type of unit-cell has greater results for aligned and single fibers. Finally, it can generally be seen that randomly oriented fibers have smaller values than similar aligned and single fiber structures with the exception being C "" of the ceramic-ceramic structures.

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“…It has been found that local elastic parameters of particles and contacts, e.g., particle stiffness and parallel bond stiffness, mainly affect the macroscopic elastic response of the entire DEM model, therefore calibrations are required [25]. As the DEM model of a composite lamina consists of two constituents (fibre and matrix) with different properties, each constituent needs to calibrated individually before combing them together with interface stiffness which is assumed equal to that of fibres [13]. Usually the macroscopic Young's modulus of the matrix or fibres is directly proportional to the stiffness of particles and parallel bonds .…”

Section: Parametric Study Of Contact Stiffnessmentioning

confidence: 99%

“…For instance, the crack propagation and stressstrain curves of composite materials under transverse tensile loading was simulated by DEM in [12,13]. It was concluded that DEM has advantages of tracing the crack path within the microstructures in addition to predicting the final failure strength.…”

Section: Introductionmentioning

confidence: 99%

A DEM model for visualising damage evolution and predicting failure envelope of composite laminae under biaxial loads

Ismail

Yang

2016

Composites Part B: Engineering

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A two dimensional particle model based on the discrete element method (DEM) is developed for micromechanical modelling of fibre reinforced polymer (FRP) composite laminae under biaxial transverse loads. Random fibre distribution within a representative volume element (RVE) is considered for the micromechanical DEM simulations. In addition to predicting the stress-strain curves of the RVEs subjected to transverse compression and transverse shear stresses against the experimental testing results and other numerical modelling results, the DEM model is also able to capture the initiation and propagation of all micro damage events. Fibre distribution is found to more significantly influence the ultimate failure of composite laminae under transverse shear, while it has much less effect on the failure under transverse compression. The failure envelope of composite laminae under biaxial transverse compression and transverse shear is predicted and compared with Hashin and Puck failure criteria, showing a reasonable agreement. The predicted failure envelope is correlated with the damage evolution and the quantitative analysis of failure events, which improves the understanding of the failure mechanisms.

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Discrete element modelling of unidirectional fibre-reinforced polymers under transverse tension

Cited by 66 publications

References 31 publications

Discrete element method for generating random fibre distributions in micromechanical models of fibre reinforced composite laminates

Discrete element method for generating random fibre distributions in micromechanical models of fibre reinforced composite laminates

Effects of unit-cell boundary type on the electromechanical properties of randomly distributed multifunctional composite structures

A DEM model for visualising damage evolution and predicting failure envelope of composite laminae under biaxial loads

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