Abstract
The work is to predict fracture behaviour of bio-composites from the tensile properties of its components. In this work, we have realized a direct numerical simulation of fracture behaviour for random short spruce fibers reinforced composites. For calculations, wood fibers have been considered as linear elastic bodies, polypropylene matrix as an elastic-plastic material. Then, numerical results have been compared with experimental results that have been obtained by digital image correlation. This comparison indicates that random fiber FE model of random short spruce fibers reinforced composites can be able to fairly reflect the influence of random fibers microstructure in the composite on its fracture behavior. The calculation of both random fiber and homogeneous FE model and their comparison with experiments show that the average values of J-integral in a region in the front of the crack tip from both numerical FE models are in good agreement with the average J value of DIC experiment in the same region when the numerical and experimental CT specimens of the short spruce fiber reinforced composite are subjected to the same extension at their loading point.
Highlights
The random spruce short fibre reinforced polypropylene (PP) composite is one kind of biocomposites with higher fibre volume content
The comparison between experiments and both finite element (FE) models for results of this bio-composite will help ones to detail understand the results and phenomenon of DIC experiments; to improve the numerical models in order to be closer to the experimental phenomenon and to increase the knowledge about the fracture behavior of this bio-composite
The comparisons between experiments and both numerical results help ones to detail understand the results and phenomenon of DIC experiments; to improve the numerical models in order to be closer to the experimental phenomenon and to increase the knowledge about the fracture behaviour of this bio-composite
Summary
The random spruce short fibre reinforced polypropylene (PP) composite is one kind of biocomposites with higher fibre volume content. The traditional optical measurements [10], such as photoelasticity, moire, holography, speckle interferometrgy, shearography, etc., which need to pretreat the surface of object with spraying paint, coating and reproducing grid, and even more to make model, may give full-field information of object deformation from the interferometric fringe Such techniques suffer from characteristic limitations and are commonly performed in the laboratory. For CT specimen of the composite, the value of J-integral and the stress field are obtained by using their DICM with a suitable material law Their experimental results of the composite show the influence of the microstructure of fibers in the material on its fracture behavior. This comparisons between experimental and numerical results for the biocomposite will help ones to detail understand the results and phenomenon of DIC experiments; to improve the numerical models in order to be more close to the experimental phenomenon and to increase the knowledge about the fracture behavior of this bio-composite
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