A comparison between mechanical properties of UHMWPE from ram extrusion process and UHMWPE from compression molding process for a hip joint liner

摘要

The compression molding (CM) forms the liner from UHMWPE powder into solid form whereas the machining process forms the liner from a bar of UHMWPE made from ram extrusion (RE) process. Our research goal is to determine and compare the mechanical properties of UHMWPE resulting from compression molding process and ram extrusion. The compression molding is experimentally proceed in UNDIP laboratory whereas the UHMWPE from ram extrusion (RE) process is imported from an European country. The mechanical properties test consists of tensile test and hardness test. The final test results of the tensile strength: CM and RE have yield strength value of 23.66 MPa and 25.25 MPa, respectively. Ultimate tensile strength of CM and RE are 35.36 MPa and 29.70 MPa, respectively. The elongation of CM is 214.75% whereas RE is 120.45%. The material hardness is 15.1 VHN for CM and 8.9 VHN for RE. The results in this study show that the CM specimens have better ultimate tensile strength, elongation, and hardness than RE specimens.