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Prepared for ASTM F04.30.06 May, 2007

This study presents finite element analysis (FEA) predictions of limit conditions for axial fatigue loading of generic coronary stent designs. It focuses on the impact of geometry and dimensional correction on fatigue behavior, stress distribution, and effective stress during extension. Residual stress effects are also examined. The analysis provides valuable insights for improving the fatigue resistance of coronary stents.

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Prepared for ASTM F04.30.06 May, 2007

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  1. Fatigue to Failure:FEA Predictions of Limit Conditions for Axial Fatigue Loadingof Generic Coronary Stent DesignsPart 2: Geometry 1 with EP correction Prepared for ASTM F04.30.06May, 2007

  2. Dimensional Correction 0.085mm 0.11mm

  3. Expansion Analysis Stress at max expansion Stress after recoil Plastic strain due to expansion

  4. Expanded Diameter Expansion Minimum ID Recoil Maximum OD

  5. Location of Max Mean and Alternating Stress Mean Stress Alternating Stress

  6. Effect of Residual Stress Effective stress during extension with residual expansion stress Effective stress during extension without residual expansion stress

  7. Fatigue Scenario Studies

  8. Fatigue Analysis ±.70 % is roughly Here ±.50 % is roughly Here ±.33 % is Here ±.33 % without residual stress is Here

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