HUESPE Alfredo Edmundo
Strain localization, strong discontinuities and material fracture: Matches and mismatches
J. OLIVER,; A.E. HUESPE; I. DIAS
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
ELSEVIER SCIENCE SA
Lugar: Amsterdam; Año: 2012 vol. 241 p. 323 - 336
The work focuses on the connections of strain localization modeling of material failure and discrete fracturemechanics. It is an attempt to give an answer to the old question of whether the finite element solutionsof material failure problems based on strain localization techniques, using standard continuumstress?strain constitutive models equipped with strain softening, have physical sense as solutions ofde-cohesive fracture mechanics problems. Based on some well-established links of the Continuum StrongDiscontinuity Approach (CSDA) to material failure and cohesive fracture mechanics, some objective indicatorsare proposed to assess the quality of strain localization results. These indicators are simply derivedon the basis of the inelastic strain distribution provided by the strain localization solutions and the directionof propagation of the localization band. They can be computed without knowledge of the exact fracturemechanics solution of the problem, and used as error indicators in a large variety of material failuresituations. The proposed indicators are assessed, by means of their application to evaluation of a numberof strain localization solutions of benchmark problems. Issues as the influence of the mesh structure andalignment, type of constitutive model and considered finite element techniques are examined. On thelight of the obtained results, classical flaws in strain localization solutions, as mesh bias dependenceand stress-locking are reinterpreted.