MCナイロンの機械的性質に関する実験的研究

抄録

Recently, various resin materials are used widely in engineering. MC nylon of thermoplastics is used as many mechanical structures such as gear and bearing. In this study, the mechanical properties of MC nylon (Polyamide 6) were investigated due to design of mechanical parts with this material. The uni-axial tensile, uni-axial compressive and simple torsion test was carried out. The strain rate dependency on the mechanical properties of MC nylon is important. Therefore, the experiments under various strain rate were carried out by using multi-loading mechanical tester (Autograph AG-G20kN ; Shimadzu corporation). The strain rate was 5.0×10^-5 s^-1~5.0×10^-2 s^-1. This mechanical tester can apply axial load and torque to specimen. Normal stress and shear stress of each test was calculated from force and torque measured by load cell, respectively. Strain was measured with strain gauge. As a result, the strain rate dependency of MC nylon under all loading conditions was clear. The shear stress at 2 % strain was lower than the normal stress regardless of strain rate. The shear strength of MC nylon with the simple torsion was the lowest and the compressive strength was the highest. Therefore, the shear loading for MC nylon parts will result in the risk of the strength degradation.