ポリエーテルエーテルケトン(PEEK)丸棒材の引張―ねじり複合変形負荷時の降伏挙動解析
Yield Behavior Analysis of Polyetheretherketone (PEEK) under the Tension-torsion Combined Stress
片桐武司・中西英二・日比貞雄
Katagiri, Takeshi / Nakanisi, Eiji / Hibi, Sadao
The yield behavior of Polyetheretherketone (PEEK) under non-uniform stress state was investigated using cylindrical rods loaded with tension-torsion combined stress. Along with the recording of tensile force and torsional torque, the change of sample shape was photographed at different stages of loading. The starting point of plastic deformation was discussed by according to the Nadai's equation. The load-unload cyclic tests under the combined stress were conducted in order to examine the generation of permanent strain. As a result, permanent strain in sample axis direction was generated after the maximum point in the torque-time curve, and this point is considered as the limit for use.
Key words: Polyetheretherketone (PEEK) / Tension-torsion combined stress / Yield behavior / Von Mises criterion / Load-unload cyclic test / Permanent strain