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Calibration of gurson–tvergaard–needleman model parameters of a niti alloy using response surface method

Voyiadjis, G. Z ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-022-07728-x
  3. Publisher: Springer , 2023
  4. Abstract:
  5. The GTN micromechanical fracture model is frequently used to predict the ductile fracture. This model is based on the microscopic mechanism of void nucleation, growth and coalescence in ductile material. GTN model includes many parameters that need to be precisely calibrated in order to obtain the maximum accuracy. In this study, an indirect approach is used to determine the GTN model parameters of a NiTi alloy by using the response surface method, RSM. This method is implemented in combination with the polynomial regression method. A quadratic polynomial equation is employed to obtain a relationship between the experimental results of smooth and notched round bar tensile tests with GTN model parameters. Furthermore, the genetic algorithm technique is used to find the tuned values of the parameters by minimizing the difference between the numerical and experimental responses. Compared with experimental results, simulations with the calibrated parameters could precisely predict the NiTi fracture process. © 2022, ASM International
  6. Keywords:
  7. GTN model ; NiTi alloy ; Parameter calibration ; RSM method
  8. Source: Journal of Materials Engineering and Performance ; Volume 32, Issue 18 , 2023 , Pages 8467-8477 ; 10599495 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11665-022-07728-x