射出発泡成形品の材料特性予測に対する等価介在物法の妥当性検討

抄録

In this study, in order to construct an analysis technique for the actual part that applies the injection foam molded plate, we examined a validity of the equivalent inclusion method for the prediction of macroscopic material properties of injection foam molded plate. As a first step of the construction of analysis techniques, "Relationship of stress and strain" of the foam layer was predicted with the equivalent inclusion method, and Young's modulus was calculated. Comparing the results of analysis and tensile tests, although differences may occur in both results, there is good qualitative agreement. As a second step of the construction of analysis technique, bending stiffness was predicted in the structural analysis with FEM model consisting of skin layer and foam layer, and the results of analysis and three-point bending test were compared. For macroscopic Young's modulus of foam layer which is the input condition for the structural analysis, calculation by the rule of mixture and prediction by the equivalent inclusion method were attempted, and the significant difference of each approach was examined. As a result, the prediction results obtained by the equivalent inclusion method show a better agreement with the test results than the prediction results obtained by applying the rule of mixture. Therefore, it is presumed that there is significant difference in each approach. From the above results, for the prediction of macroscopic material properties of injection foam molded plate, it is presumed that the equivalent inclusion method has validity and high reliability.