|Author||Hwang, Ji Hoon ♦ Lee, Seonggi ♦ Hwang, So Young ♦ Kim, Naksoo|
|Publisher||Korean Society of Rheology, Australian Society of Rheology|
|Subject Domain (in DDC)||Technology ♦ Engineering & allied operations|
|Subject Keyword||mastic sealer ♦ blowing agent ♦ thermal property ♦ foaming model ♦ micro-deformation ♦ Characterization and Evaluation of Materials ♦ Polymer Sciences ♦ Soft and Granular Matter, Complex Fluids and Microfluidics ♦ Mechanical Engineering ♦ Food Science|
|Abstract||In order to numerically simulate the foaming behavior of mastic sealer containing the blowing agent, a foaming and driving force model are needed which incorporate the foaming characteristics. Also, the elastic stress model is required to represent the material behavior of co-existing phase of liquid state and the cured polymer. It is important to determine the thermal properties such as thermal conductivity and specific heat because foaming behavior is heavily influenced by temperature change. In this study, three models are proposed to explain the foaming process and material behavior during and after the process. To obtain the material parameters in each model, following experiments and the numerical simulations are performed: thermal test, simple shear test and foaming test. The error functions are defined as differences between the experimental measurements and the numerical simulation results, and then the parameters are determined by minimizing the error functions. To ensure the validity of the obtained parameters, the confirmation simulation for each model is conducted by applying the determined parameters. The cross-verification is performed by measuring the foaming/shrinkage force. The results of cross-verification tended to follow the experimental results. Interestingly, it was possible to estimate the micro-deformation occurring in automobile roof surface by applying the proposed model to oven process analysis. The application of developed analysis technique will contribute to the design with minimized micro-deformation.|
|Age Range||18 to 22 years ♦ above 22 year|
|Education Level||UG and PG|
|Learning Resource Type||Article|
|Journal||Korea-Australia Rheology Journal|
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