Error behaviour in explicit integration algorithms with automatic substepping
- Publication Type:
- Journal Article
- International Journal for Numerical Methods in Engineering, 2016, 108, (9), pp. 1030-1053
- Issue Date:
|Numerical Meth Engineering - 2016 - Lloret‐Cabot - Error behaviour in explicit integration algorithms with automatic.pdf||Published version||926.71 kB|
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This paper studies the behaviour of the error incurred when numerically integrating the elasto-plastic mechanical relationships of a constitutive model for soils using an explicit substepping formulation with automatic error control. The correct update of all the variables involved in the numerical integration of the incremental stress–strain relationships is central to the computational performance of the integration scheme, and, although often missed in the literature, all variables (including specific volume) should be explicitly considered in the algorithmic formulation. This is demonstrated in the paper by studying, in the context of the Cam clay formulations for saturated soils, the influence that the updating of the specific volume has on the accuracy of the numerical solution. The fact that the variation of the local error with the size of the integrated strain depends on the order of local accuracy of the numerical method is also used in the paper to propose a simple and powerful strategy to verify the correctness of the implemented mathematical formulation. Copyright © 2016 John Wiley & Sons, Ltd.
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