プラスチック/ゴム系ポリマーブレンドの応力解析
Stress Analysis for a Plastic/Rubber Polymer Blend
福永守高・野々村千里
Fukunaga, Moritaka / Nonomura, Chisato
Rubber modified plastics have been studied by many researchers, and the relationship between mechanical properties and microscopic structures has been investigated by use of numerical analysis. In most numerical analyses, a linear-elastic constitutive law was applied for rubber because of its much lower elastic modulus.
We have tried to analyze a plastic/rubber blend system by use of non-linear FEM (MARC K-4). In this study, we applied elasto-plastic and Mooney-Rivlin constitutive laws to plastic and rubber regions respectively. Interesting results were obtained from numerical results.
The results are summarized as follows ;
(1) After the test piece was tensioned at 25% strain, it unloaded. Unloading behaviors of plastic/rubber blend systems were qualitatively demonstrated by combinational use of elasto-plastic and Mooney-Rivlin constitutive laws.
(2) We proposed to adopt a 5-parameter Mooney-Rivlin constitutive law where the rubber region which is subjected to large deformation.
Key words: Finite element method / Polymer blend / Non-linear analysis / Rubber modified plastics / Mooney-Rivlin constitutive law