Biocomposite materials Cellular structure 1 Characterization 1 Constitutive materials 1 Fibers 1 Finite element method 1 Finite element modelling 1 Interfaces (materials) 1 Mechanical behaviour 1 Mechanical characterisation 1 Oil palm fibres 1 Palm oil 1 Silica 1 Stress analysis 1 Stress relaxation 1 Tensile testing 1 Unloading 1 Viscoelastic modeling 1 Viscoelasticity 1 finite element analysis (FEA) 1 tensile testing 1 viscoelasticity 1