INVESTIGADORES
HUESPE Alfredo Edmundo
artículos
Título:
Study of a stabilized mixed finite element with emphasis on its numerical performance for strain localization problems
Autor/es:
P.J. SÁNCHEZ; V. SONZOGNI; A.E. HUESPE
Revista:
COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING
Editorial:
JOHN WILEY & SONS LTD
Referencias:
Año: 2008 vol. 24 p. 297 - 320
ISSN:
1069-8299
Resumen:
The numerical performance of a stabilized mixed finite-element formulation based on the pressuregradient-projection method (PGP) using equal-order (linear) interpolation is evaluated by solving solidmechanics problems, such as structural limit load determination and strain localization modelling. Allof them present incompressibility kinematical constraints induced by the constitutive behaviour. Thiswork is specially devised to obtain critical conclusions about the use of PGP model when the mechanicalresponse is governed by strain-softening macroscopic mechanisms. In this context, we report some detectedlimitations in the present formulation due to the existence of pathological mesh bias dependence once thestrain localization process becomes dominant, and linear kinematics is used. An additional contributionis the numerical comparative analysis of two different strategies, for solving the complete linear equationsystem, addressed to a finite-element parallel code. The numerical results are compared with the standardGalerkin formulation and with an alternative stabilized mixed finite-element procedure (pressure stabilizingPetrov?Galerkin scheme).