PREDIKSI SIFAT MATERIAL PRESSURE TRANSMITING MEDIUM PADA QUASI-ISOSTATIC PRESSING MENGGUNAKAN FINITE ELEMENT ANALYSIS

Abstract

Quasi-isostatic pressing technique is developed from isostatic pressing, which is made more simple and efficient. Quasi-isostatic pressing can provide the effect of volumetric triaxial compaction, so that it can produce compaction with uniform density. With these advantages, the quasi-isostatic pressing technique is used in pebble fuel fabrication process for high-temperature gas-cooled reactors (HTGR). The main problem in the quasi-isostatic pressing technique lies in need of hyperelastic material as a pressure transmitting medium (PTM) to transmit uniform static pressure in all directions in the compacting process. Therefore, the properties and characteristics of the PTM material needed for quasi-isostatic pressing with the boundary conditions of process must be determined. In this paper Finite Element Analysis (FEA) was used to predict the properties and characteristics (constants) of PTM materials for the quasi-isostatic pressing process using Mooney-Rivlin 2 and 3 parameters and single-acting press methods. From the results of FEA experiments, C₁₀ values of 120 MPa, C₀₁ of 49 MPa and C₁₁ of 10 MPa were obtained. However, the quasi-isostatic pressing process for graphite powder compacting has not completed perfectly, so further research will be carried out with numerical improvement and the use of the Mooney-Rivlin 5 to 9 parameter model using double-acting press method.