The Micro-modeling And Multi-scale Performance Analysis On The Short Fiber Reinforced Composites

Short fiber reinforced composite(SFRP)has the advantages of rapid manufacturing and good mechanical performance.SFRP that has become an important substitute for traditional materials is currently widely used in engineering fields such as transportation and aerospace field.Therefore,it is great significance to accurately predict the mechanical properties of SFRP in order to expand the application range..In most cases of engineering,experiment methods are used to measure its performance parameters.There is currently no efficient and accurate method to predict the mechanical properties of SFRP.Moreover,many existing failure criteria are based on macro models,which ignoring the interaction of micro-level components and the multi-scale characteristics of SFRP.These failure criteria are not common and lack detailed information at a micro level.Lots of tests have to be performed to obtain the experiment data.Therefore,it is necessary to establish a multi-scale failure analysis method for the design,manufacturing and application of SFRP.This study is supported by the Fundamental Research Funds for the Central Universities(DUT18JC27)and National Science Foundation in China(51790172)The specific work of this article is as follows:First,the characteristic of random distribution had been considered for the SFRP.in order to realize the free meshing,the general periodic boundary conditions suitable for non-periodic meshing were proposed in the finite element method based on RVE..The advantages of the MSG method compared to the other two methods were described.Then,the multi-scale analysis framework was established by using the homogenization method.Second,based on the ABAQUS PDE platform,the RSA algorithm,which took the fiber collision algorithm of image processing into account,was used to establish the micro unit cell finite element model of SFRP.,The parametric modeling was implemented.Third,the Halpin-Tsai equation,RVE method and MSG method were employed to homogenize the microscopic unit cell model of SFRP.The equivalent elastic properties predicted by the three methods and the computational efficiency were compared.The superiority of the MSG method in predicting the equivalent elastic properties of SFRP was verified.Then,the effects of fiber volume fraction,fiber length-to-diameter ratio,fiber deflection angle and fiber length standard deviation on the equivalent elastic properties were analyzed by the SFRP micro unit cell model.The results showed that the equivalent elastic properties of SFRP were mainly affected by fiber volume fraction and fiber orientation.Fourth,the strength analysis for the micro model is performed.The numerical and experimental results showed that the stress-strain curve trend and shape were similar.However,the predicted strength value has a certain deviation compared to the experiment result.The macro performance properties were obtain by micro model.The multi-scale analysis based on the hierarchical method is employed to accomplish the virtual simulate experiment for the SFRP lattice sandwich structure under out-plane compression.