Prediction Of Effective Elastic Modulus And Analysis Of Influencing Factors For Particle Reinforced Composites

Particle reinforced composites have many advantages which are not existing in many traditional materials,and have been widely used in present engineering fields.The interphase layer between matrix and inclusions plays an important role in improving effective properties of composites.Based on the micromechanics research method,the effective elastic properties of three phase particle-reinforced composites with the existence of interphase are studied in this investigation.On the basis of the traditional micromechanics theory system,the effective properties of particle reinforced composites are predicted and analyzed.First,the interphase in the composite is proposed as a linear elastic spring model,and the particle and interphase are defined as an equivalent inclusion,respectively.The effective moduli of spherical-particle-reinforced composite are obtained with the help of a modified self-consistent method.A statistical criterion of debonding is also proposed to characterize the change rule in the process of interphase damage.Then,a nested model with three layers is put forward,in which a spheroid inclusion is surrounded by the interphase and matrix successively.By combining the self-consistent method and M-T scheme,we obtain the effective properties of aligned-particle reinforced composites,and the interaction between particles and interphase are also taken into account.Finally,the present work aims to predict mechanical properties of spheroidal-particle reinforced composites using a new model considering the effect of the interphase between particles and matrix.The energy-based effective strain method is proposed to better exhibit the energy stored in the three-phase composites by replacing average strain with the effective strain.Moreover,the current methodology is,in general,extended to the case of composites containing multiple types of inclusions.The influences of the particle shape/size and the interphase thickness on effective elastic moduli are analyzed,and the obtained results agree well with the experimental data and existing theories.