Key Technique In Analyzing The Mechanical Properties Of Glass Fiber Reinforced Microcellular Plastic Based On Multi-scale Method

Glass fiber reinforced microcellular plastic by injection molding has become a hot issue in present research and is widely used because of its advantages,such as high strength,light weight,insulation temperature resistance and corrosion resistance,etc.However,it is hard to analyze or predict its mechanical properties because it may form a multi-scale microstructure while the glass fiber and bubbles exist simultaneously.Nevertheless,it provides the researcher a new train of thought that the studies on homogenization theory show a better prediction in solving multi-scale problem compared to other methods.In this research,A series of RVE(Representative Volume Element)for various cases of microcellular structure and porosity were established to capture the microstructure in microcellular plastic using sphere bubble models.And the numerical simulation result based on homogenization theory agrees with the experimental data and typical theoretical equation.It explores the feasibility of homogenization theory and bubble RVE for the elastic mechanical properties of microcellular plastic prediction.Subsequently,specimens taken from microcellular plastic injection molded door plank are used for research.RVE models were established respectively for fiber and bubbles in different layer and structure rank according to the microscopic observation on specimens.By applying numerical simulation based on homogenization theory,we found that homogenization result is highly agreed with the experimental data.It reveals the feasibility of homogenization theory in engineering application and can make a good prediction of elastic mechanical properties in glass fiber reinforced microcellular plastic.In conclusion,this research shows that homogenization theory is validated to predict the equivalent elastic mechanical properties of glass fiber reinforced microcellular plastic when the RVE models are properly established.In addition,this paper provides the scientific basis for further study of homogenization theory for engineering application.