Thursday, October 31st, 2019. Time: 12h.
Place: O.C. Zienkiewicz Conference Room, C1 Building, UPC Campus Nord, Barcelona
The standard FE formulation in solid mechanics is inadequate for solving cracking problems in quasi-brittle materials because it produces spuriously mesh-dependent results in terms of the computed crack paths.
Mixed strain/displacement finite elements are considered by the research group to address the issues related to this problem. Mixed finite elements have certified to produce results without spurious mesh-bias and predict more accurately crack trajectories in a determining way. They have shown to provide reliable computations of the structural response, damage patterns, force-displacement curves and collapse mechanisms in numerical simulations.
In cyclic loading situations, several damage constitutive laws have been developed to include microcrack closure-reopening (MCR) effects, as well as tensile and compressive damage and irreversible strains. The models are able of accurately evaluating stiffness recovery in the force-displacement curves and can capture the closure and reopening of multiple cracks in the computed body.
The feasibility and performance of the method has been extensively assessed through numerical benchmarks and comparison with experimental evidence. Spurious mesh dependency is avoided without the need of crack tracking techniques or other computational schemes that alter the continuum mechanical problem.
Gabriel Barbat is a Civil Engineer from UPC and a Ph.D. student in the COMET research group. His research work is centered on the numerical modeling of fracture in quasi-brittle materials with enhanced accuracy.
IMPORTANT NOTE! From March 2019 registration is mandatory. The access is open and free, but it is necessary to register before attending. Please, fill in the following form if you want to attend the seminar.