Elvin Chia | National University of Singapore (original) (raw)

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Papers by Elvin Chia

Research paper thumbnail of Multi-scale Simulation and FE-Assisted Computation of Elastic Properties of Braided Textile Reinforced Composites

Research paper thumbnail of Constituent materials micro-damage modeling in predicting progressive failure of braided fiber composites

Composite Structures, 2016

Constituent materials micro-damage modeling in predicting progressive failure of braided fibre co... more Constituent materials micro-damage modeling in predicting progressive failure of braided fibre composites,

Research paper thumbnail of Mechanical and Interfacial Properties Characterisation of Single Carbon Fibres for Composite Applications

Experimental Mechanics, 2015

The mechanical and interfacial properties of single carbon fibres have been experimentally invest... more The mechanical and interfacial properties of single carbon fibres have been experimentally investigated. Longitudinal tensile strengths were determined using single filament as well as impregnated yarn specimens at various gauge lengths ranging from 5 to 200 mm. The tensile behaviour of the fibre depends on gauge length due to the presence of flaws along the fibre. Axial compressive strength was obtained by the tensile recoil method. The transverse modulus was measured by nanoindentation technique. Shear modulus was obtained by a torsional pendulum test. The apparent shear strength of carbon fibre/epoxy interface was characterised by a microbond fibre pull-out test. Data obtained in this work constitute important materials' data input for the design and simulation of carbon fibre composite structures.

Research paper thumbnail of Multi-scale simulation and finite-element-assisted computation of elastic properties of braided textile reinforced composites

Journal of Composite Materials, 2013

This article deals with the computation of effective elastic properties of braided textile compos... more This article deals with the computation of effective elastic properties of braided textile composites assisted by finite element analysis. In this approach, dynamic representative unit cells are first constructed to model typical geometry of braided textile preform. After establishing the elastic properties of braiding yarns, the effective Young’s moduli, shear moduli and Poisson’s ratios corresponding to varying braiding angles are obtained by analysing these geometric models of preform with the help of the commercial finite element analysis code Abaqus. Effects of fibre volume fraction on the elastic properties of both biaxial and triaxial composite unit cells are also examined. Finally, the bending behaviour of a simply supported beam with braided composite skin is evaluated via the finite element analysis assisted multi-scale modelling, which is further verified experimentally. The predicted results were compared favourably with the experiment, backing the accuracy of the propos...

Research paper thumbnail of Damage advancement behavior in braided composite structures for mini aerial vehicles

Mechanics of Advanced Materials and Structures, 2017

This work provides a systematic approach to accurately predict damage progression in a composite ... more This work provides a systematic approach to accurately predict damage progression in a composite structure subjected to bending load. Landing gear structures for unmanned aerial vehicle (UAV) were fabricated from braided textile preforms and assessed for flexural behavior. A multi-scale finite element analysis (FEA) model was developed for analyzing the progressive damage of these structures under bending loads. Micro-scale and meso-scale analyses were carried out first. Subsequently, the results of micro-scale and meso-scale analyses were used as inputs in macro-scale analyses that predicted the progressive damages in the entire landing gear structure. The numerical results were validated by experimental studies.

Research paper thumbnail of Multi-scale Simulation and FE-Assisted Computation of Elastic Properties of Braided Textile Reinforced Composites

Research paper thumbnail of Constituent materials micro-damage modeling in predicting progressive failure of braided fiber composites

Composite Structures, 2016

Constituent materials micro-damage modeling in predicting progressive failure of braided fibre co... more Constituent materials micro-damage modeling in predicting progressive failure of braided fibre composites,

Research paper thumbnail of Mechanical and Interfacial Properties Characterisation of Single Carbon Fibres for Composite Applications

Experimental Mechanics, 2015

The mechanical and interfacial properties of single carbon fibres have been experimentally invest... more The mechanical and interfacial properties of single carbon fibres have been experimentally investigated. Longitudinal tensile strengths were determined using single filament as well as impregnated yarn specimens at various gauge lengths ranging from 5 to 200 mm. The tensile behaviour of the fibre depends on gauge length due to the presence of flaws along the fibre. Axial compressive strength was obtained by the tensile recoil method. The transverse modulus was measured by nanoindentation technique. Shear modulus was obtained by a torsional pendulum test. The apparent shear strength of carbon fibre/epoxy interface was characterised by a microbond fibre pull-out test. Data obtained in this work constitute important materials' data input for the design and simulation of carbon fibre composite structures.

Research paper thumbnail of Multi-scale simulation and finite-element-assisted computation of elastic properties of braided textile reinforced composites

Journal of Composite Materials, 2013

This article deals with the computation of effective elastic properties of braided textile compos... more This article deals with the computation of effective elastic properties of braided textile composites assisted by finite element analysis. In this approach, dynamic representative unit cells are first constructed to model typical geometry of braided textile preform. After establishing the elastic properties of braiding yarns, the effective Young’s moduli, shear moduli and Poisson’s ratios corresponding to varying braiding angles are obtained by analysing these geometric models of preform with the help of the commercial finite element analysis code Abaqus. Effects of fibre volume fraction on the elastic properties of both biaxial and triaxial composite unit cells are also examined. Finally, the bending behaviour of a simply supported beam with braided composite skin is evaluated via the finite element analysis assisted multi-scale modelling, which is further verified experimentally. The predicted results were compared favourably with the experiment, backing the accuracy of the propos...

Research paper thumbnail of Damage advancement behavior in braided composite structures for mini aerial vehicles

Mechanics of Advanced Materials and Structures, 2017

This work provides a systematic approach to accurately predict damage progression in a composite ... more This work provides a systematic approach to accurately predict damage progression in a composite structure subjected to bending load. Landing gear structures for unmanned aerial vehicle (UAV) were fabricated from braided textile preforms and assessed for flexural behavior. A multi-scale finite element analysis (FEA) model was developed for analyzing the progressive damage of these structures under bending loads. Micro-scale and meso-scale analyses were carried out first. Subsequently, the results of micro-scale and meso-scale analyses were used as inputs in macro-scale analyses that predicted the progressive damages in the entire landing gear structure. The numerical results were validated by experimental studies.

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