INVESTIGADORES
HUESPE Alfredo Edmundo
congresos y reuniones científicas
Título:
Applications of Crack Path Field and Strain Injection Techniques in Dynamic Fracture of Quasi-Brittle Materials
Autor/es:
LLOVEAS-VALS O.; A E. HUESPE; J. OLIVER,; DIAS I.
Lugar:
Barcelona
Reunión:
Conferencia; XIII International Conference on Computational Plasticity (COMPLAS 2015; 2015
Institución organizadora:
CIMNE
Resumen:
Dynamic fracture processes in quasi-brittle materials strongly determine the strength, stiffness andductility [1] which are key issues for structural design purposes. Inertia forces become dominant athigh loading rates and crack propagation instabilities such as curving and branching appear when acritical crack tip velocity is exceeded [2].In this study the physical discontinuities are simulated using Finite Elements with Embedded strongdiscontinuities (E-FEM) which are seen as affordable and efficient intra-elemental modelingtechniques since no extra degrees of freedom are added in the onset of fracture. Previous research instatic analyses of quasi-brittle materials [3,4] show that classical strain localization and strongdiscontinuity approaches can be considered by injecting discontinuous strain and displacementmodes in the finite element formulation. The use of displacement discontinuities in the kinematicsresults of utmost importance in order to avoid stress locking and mesh bias dependence but requirestracking techniques which determine the position and orientation of the discontinuity. The crack pathfield technique [3,4] is adopted in this contribution which tackles the crack propagation problembased on the distribution of localized strains.The above mentioned technology is adapted for dynamic simulations on a concrete specimensubjected to different loading rates. Crack branching phenomena and the variation in terms of failuremodes is investigated when modeled with the strain injection and crack path field algorithms.