熱可塑性樹脂の板状試験片を対象とした 熱機械軸疲労試験手法の開発

抄録

An axial thermo-mechanical fatigue testing method was developed to evaluate the mechanical properties of thermoplastic resin under the actual conditions of use. The suitable shape and dimensions of the plate type specimen for the axial cyclic fatigue test were determined with numerical analysis and tensile testing. In addition, a heating and cooling method for the resin specimens at a thermal cycle rate of 1 K/s was established. The axial thermo-mechanical fatigue test and isothermal fatigue test of glass fiber reinforced polyphenylene sulfide was available with the plate type specimen that has 4 mm width at the center gauge part. In-phase type and out-of-phase type thermo-mechanical fatigue tests were conducted in the temperature range of 253 K (-20°C) to 393 K (120°C) under mechanical strain control conditions. Mean stress at the in-phase type test was lower than that at the out-of-phase type thermo-mechanical fatigue test.