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Volume weighted probabilistic methods for nitinol lifetime prediction PDF
Preview Volume weighted probabilistic methods for nitinol lifetime prediction
Volume weighted probabilistic methods for nitinol lifetime prediction Craig Bonsignore Karthikeyan Senthilnathan Ali Shamimi Confluent Medical Technologies | Fremont California © 2017 Confluent Medical Technologies > Introduction Volumetric FEA methods Sub-µm x-ray computed tomography Monte-Carlo risk assessment Resources 2 © 2017 Confluent Medical Technologies Motivation 3 © 2017 Confluent Medical Technologies 4 © 2017 Confluent Medical Technologies cyclic fatigue condition 9% cyclic change in diameter 5 © 2017 Confluent Medical Technologies typical point cloud 9% cyclic change in diameter 6 © 2017 Confluent Medical Technologies critical volumes a small proportion of the volume exceeds a critical limit of strain amplitude. 7 © 2017 Confluent Medical Technologies Introduction > Volumetric FEA methods Sub-µm x-ray computed tomography Monte-Carlo risk assessment Resources 8 © 2017 Confluent Medical Technologies Tools to extract volume data and more • integration point volume • strain, stress at crimping step (pre-strain) • hydrostatic pressure (tension vs. compression) • volume fraction of martensite • mean stress/strain • stress/strain amplitude • stress and strain components 9 © 2017 Confluent Medical Technologies Typical point cloud Transform to absolute value, set EA to zero for points in compression open−frame−fatigue−v25mm−9pct 0.8% strain amplitude vs. mean strain 0.6% cyc.Tension a 0.4% FALSE ε TRUE 0.2% 0.0% 0% 1% 2% 3% 4% ε m 10 © 2017 Confluent Medical Technologies