Fatigue Testing: The Effects of Different Surface Treatments on Nitinol Key Paper Lucy Zhu MatE 198B Advisor: Dr. Stacy Gleixner.

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Presentation transcript:

Fatigue Testing: The Effects of Different Surface Treatments on Nitinol Key Paper Lucy Zhu MatE 198B Advisor: Dr. Stacy Gleixner

Overview Purpose Elements Key Paper Experimental Approach Experimental Results Significance Drawbacks Conclusions

Purpose Need for biomedical devices Nitinol is a desirable material Understand relation between surface treatment and fatigue

Elements Behavior of superelastic nitinol Fatigue behavior of nitinol Effect of surface treatments

Key Paper Yang, Jianhua, Fatigue Characterization of Superelastic Nitinol, SMST-97: Proceedings of the Second International Conference on Shape Memory and Superelastic Technologies, 1997, p

Experimental Approach Binary superelastic nitinol wire Rotary beam bend method Strain-controlled Fatigue to failure Test performed at various temperatures Test performed with different heat treatments

Experimental Results

As-Treated Aged

Significance Nitinol wires tested Rotary beam bending method Fatigue dependent on strain, temperature, and heat treatment

Drawbacks No information about surface treatments Lack of details on presented information

Conclusions Nitinol wire is an effective test material Strain-controlled bend fatigue testing Have not found published data on fatigue testing of NiTi with various surface treatments

Thank You