Browsing by Subject "Mecànica de fractura"
Now showing items 1-20 of 124
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A blended shifted-fracture/phase-field framework for sharp/diffuse crack modeling
(2023-02-28)
Article
Open AccessThe shifted fracture method (SFM) is an embedded method that enables sharp crack representations while using mesh-fitted data structures. In the SFM, the true crack is embedded in the computational grid, but the crack ... -
A comparative review of XFEM, mixed FEM and phase-field models for quasi-brittle cracking
(2022-03)
Article
Restricted access - publisher's policyIn this work, a critical comparison between three different numerical approaches for the computational modelling of quasi-brittle structural failure is presented. Among the many finite element approaches devised to solve ... -
A comparison of the state of the art models for constitutive modelling of concrete
(2021-02-01)
Article
Open AccessConcrete is undoubtedly the most important and widely used construction material of the last centuries. Nevertheless, mathematical models that can accurately capture the particular material behaviour under all loading ... -
A continuous damage model to mimic sharp cracks in quasi-brittle materials
(Universitat Politècnica de Catalunya, 2018-06)
Master thesis
Open AccessA usual trick in various modelling approaches for computational fracture (i.e. damage models, phase-field approaches) is to include an artificial residual stiffness. This is done to avoid singularity of the tangent stiffness ... -
A continuous-discontinuous model for crack branching
(John Wiley & sons, 2019-10-05)
Article
Open AccessA new continuous-discontinuous model for fracture that accounts for crack branching in a natural manner is presented. It combines a gradient-enhanced damage model based on nonlocal displacements to describe diffuse cracks ... -
A continuous-discontinuous model to introduce fluid pressure in a crack.
(Universitat Politècnica de Catalunya, 2016-07-14)
Bachelor thesis
Open AccessCracking of quasi-brittle materials (such as concrete, rocks,) may be modelled by means of continuous, discontinuous or continuous-discontinuous models. The latter combine a continuous damage model for the initial stages ... -
A continuous-discontinusous model to simulate crack branching in quasi-brittle failure
(Universitat Politècnica de Catalunya, 2016-07-20)
Master thesis
Open AccessUnderstanding the material failure of quasi-brittle materials, such as concrete, is of vital importance in civil engineering. A continuous-discontinuous model using X-FEM enrichment can be useful when an explicit representation ... -
A crack-tracking technique for localized cohesive-frictional damage
(2015-12-01)
Article
Open AccessThis paper extends the use of crack-tracking techniques within the smeared crack approach for the numerical simulation of cohesive-frictional damage on quasi-brittle materials. The mechanical behaviour is described by an ... -
A fracture mechanics approach to develop high crash resistant microstructures by press hardening
(2017)
Conference report
Open AccessCrashworthiness is a relevant engineering property for car parts. However it is not easy to measure at laboratory scale and complex impact tests have to be carried out to determine it. Crash re-sistance for high strength ... -
A frequency-based approach for the detection and classification of structural changes using t-SNE
(Multidisciplinary Digital Publishing Institute (MDPI), 2019-11-21)
Article
Open AccessThis work presents a structural health monitoring (SHM) approach for the detection and classification of structural changes. The proposed strategy is based on t-distributed stochastic neighbor embedding (t-SNE), a nonlinear ... -
A hybridizable discontinuous Galerkin phase-field model for brittle fracture
(2019-05-01)
Article
Open AccessPhase-field models for brittle fracture consider smeared representations of cracks, which are described by a continuous field that varies abruptly in the transition zone between unbroken and broken states. Computationally, ... -
A model for the ultrasonic detection of surface-breaking cracks by the scanning laser source technique
(2004-01)
Article
Open AccessA model for the scanning laser source (SLS) technique is presented. The SLS is a novel laser-based inspection method for the ultrasonic detection of small surface-breaking cracks. The generated ultrasonic signal is monitored ... -
A new continuous-discontinuous damage model: cohesive cracks via an accurate energy-transfer process
(2014-02)
Article
Open AccessA new continuous-discontinuous strategy to describe failure of quasi-brittle materials is presented. For the early stages of the failure process, a gradient-enhanced model based on smoothed displacements is employed. As ... -
A Proper Generalized Decomposition (PGD) approach to crack propagation in brittle materials: with application to random field material properties
(Springer, 2020-02)
Article
Open AccessUnderstanding the failure of brittle heterogeneous materials is essential in many applications. Heterogeneities in materialproperties are frequently modeled through random fields, which typically induces the need to solve ... -
A unified non-linear energy dissipation-based plastic-damage model for cyclic loading
(2022-10)
Article
Open AccessA new energy-dissipation-based rate-independent constitutive law within the framework of elastoplasticity coupled with damage is proposed. With this methodology, the inelastic strains and the stiffness degradation exhibited ... -
A variational model of fracture for tearing brittle thin sheets
(2018-10)
Article
Open AccessTearing of brittle thin elastic sheets, possibly adhered to a substrate, involves a rich interplay between nonlinear elasticity, geometry, adhesion, and fracture mechanics. In addition to its intrinsic and practical interest, ... -
Adaptive phase-field modeling of fracture propagation in bi-layered materials
(2023-11-15)
Article
Restricted access - publisher's policyWe study fracture propagation in bi-layered materials using an adaptive phase-field method. The method combines a phase-field representation of fracture with spatial adaptivity to provide mesh refinement in the smeared ... -
Adaptive phase-field modeling of heterogeneous materials
(Universitat Politècnica de Catalunya, 2023-06)
Bachelor thesis
Open AccessComprendre el comportament de les fractures és crucial per optimitzar el disseny d'estructures i components d'enginyeria, des de les infraestructures civils fins als components d'aeronaus. El model "phase-field" s'ha tornat ... -
Adaptive refinement for phase-field models of brittle fracture based on Nitsche's method
(Springer, 2020-03-18)
Article
Open AccessA new adaptive refinement strategy for phase-field models of brittle fracture is proposed. The approach provides a computationally efficient solution to the high demand in spatial resolution of phase-field models. The ... -
Analyse multi-échelle de l'approche énergétique de la rupture des grains au sein de matériaux granulaires
(Universitat Politècnica de Catalunya, 2017-01-11)
Doctoral thesis
Open Access
Covenantee: École centrale de NantesAu cours des dernières années, les analyses multi-échelles en mécanique des sols granulaires deviennent de plus en plus répandues. L’avantage de ce type d’approches réside dans leur capacité à établir un lien entre les ...