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Integrating GLL-Weibull Distribution Within a Bayesian Framework for Life Prediction of Shape Memory Alloy Spring Undergoing Thermo-mechanical Fatigue

  • Pradeep KunduEmail author
  • Tameshwer Nath
  • I. A. Palani
  • Bhupesh K. Lad
Article
  • 134 Downloads

Abstract

The present paper tackles an important but unmapped problem of the reliability estimations of smart materials. First, an experimental setup is developed for accelerated life testing of the shape memory alloy (SMA) springs. Generalized log-linear Weibull (GLL-Weibull) distribution-based novel approach is then developed for SMA spring life estimation. Applied stimulus (voltage), elongation and cycles of operation are used as inputs for the life prediction model. The values of the parameter coefficients of the model provide better interpretability compared to artificial intelligence based life prediction approaches. In addition, the model also considers the effect of operating conditions, making it generic for a range of the operating conditions. Moreover, a Bayesian framework is used to continuously update the prediction with the actual degradation value of the springs, thereby reducing the uncertainty in the data and improving the prediction accuracy. In addition, the deterioration of material with number of cycles is also investigated using thermogravimetric analysis and scanning electron microscopy.

Keywords

Bayesian fatigue analysis GLL-Weibull life estimation reliability shape memory alloy (SMA) 

Notes

Acknowledgments

The authors are grateful to the Sophisticated Instrumentation Centre (SIC), Indian Institute of Technology Indore for providing the characterization facilities.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Pradeep Kundu
    • 1
    Email author
  • Tameshwer Nath
    • 2
  • I. A. Palani
    • 2
  • Bhupesh K. Lad
    • 3
  1. 1.Vibration Research Lab, Department of Mechanical EngineeringIIT DelhiNew DelhiIndia
  2. 2.Mechatronics and Instrumentation Lab, Discipline of Mechanical EngineeringIIT IndoreIndoreIndia
  3. 3.Industrial and Systems Engineering, Discipline of Mechanical EngineeringIIT IndoreIndoreIndia

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