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Title: Trust-region based return mapping algorithm for implicit integration of elastic-plastic constitutive models

Journal Article · · International Journal for Numerical Methods in Engineering
DOI:https://doi.org/10.1002/nme.5515· OSTI ID:1343620

A new method for the solution of the non-linear equations forming the core of constitutive model integration is proposed. Specifically, the trust-region method that has been developed in the numerical optimization community is successfully modified for use in implicit integration of elastic-plastic models. Although attention here is restricted to these rate-independent formulations, the proposed approach holds substantial promise for adoption with models incorporating complex physics, multiple inelastic mechanisms, and/or multiphysics. As a first step, the non-quadratic Hosford yield surface is used as a representative case to investigate computationally challenging constitutive models. The theory and implementation are presented, discussed, and compared to other common integration schemes. Multiple boundary value problems are studied and used to verify the proposed algorithm and demonstrate the capabilities of this approach over more common methodologies. Robustness and speed are then investigated and compared to existing algorithms. As a result through these efforts, it is shown that the utilization of a trust-region approach leads to superior performance versus a traditional closest-point projection Newton-Raphson method and comparable speed and robustness to a line search augmented scheme.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
DOE Contract Number:
AC04-94AL85000
OSTI ID:
1343620
Report Number(s):
SAND-2016-11942J; 649449
Journal Information:
International Journal for Numerical Methods in Engineering, Vol. 112, Issue 3; ISSN 0029-5981
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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  • Rabahallah, Meziane; Balan, Tudor; Bouvier, Salima
  • International Journal for Numerical Methods in Engineering, Vol. 80, Issue 3 https://doi.org/10.1002/nme.2640
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