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Spin fatigue testing of Pt-20Ir and MP35N wires and tension-tension (T-T) fatigue testing of Pt-20Ir and MP35N coils were performed. FEA analysis was performed to calculate the maximum principal strain on wire and coil filar. Results show that the endurance limit strain of MP35N coil from tension-tension fatigue testing is 32.6% less than that of the MP35N wire spin fatigue testing. The endurance limit strain of Pt-20Ir coil from tension-tension fatigue testing is 8.0% less than that of the Pt-20Ir wire spin fatigue testing. The multiaxial stress affects MP35N wire more than Pt-20Ir wire. The study indicates that spin fatigue data (S–N curve) of wire can be reasonably used to predict Pt-20Ir coil fatigue life. However, it is not suitable to use spin fatigue data of MP35N wire to predict MP35N coil fatigue life.

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Multi-axial Effect on the Fatigue Performance of Pt-20Ir and MP35N Coils Used in Medical Device

  • 会议论文

  • 发表日期：

    2025年

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  • Haitao Zhang,
  • Dan Sorensen,
  • Bernard Li

摘要

Spin fatigue testing of Pt-20Ir and MP35N wires and tension-tension (T-T) fatigue testing of Pt-20Ir and MP35N coils were performed. FEA analysis was performed to calculate the maximum principal strain on wire and coil filar. Results show that the endurance limit strain of MP35N coil from tension-tension fatigue testing is 32.6% less than that of the MP35N wire spin fatigue testing. The endurance limit strain of Pt-20Ir coil from tension-tension fatigue testing is 8.0% less than that of the Pt-20Ir wire spin fatigue testing. The multiaxial stress affects MP35N wire more than Pt-20Ir wire. The study indicates that spin fatigue data (S–N curve) of wire can be reasonably used to predict Pt-20Ir coil fatigue life. However, it is not suitable to use spin fatigue data of MP35N wire to predict MP35N coil fatigue life.