Crack onset in stretched open hole PMMA plates considering linear and non-linear elastic behaviours

Dynamic crack initiation assessment with the coupled criterion

“…In particular, the initiation stress variation measured experimentally is well reproduced numerically for a v crack =700 m/s crack velocity. This crack velocity is in the order of magnitude of experimentally measured crack velocities in PMMA [11,60,61,62,63].…”

“…Therefore, the property of stress and energy proportionality to respectively the prescribed loading and the square of prescribed loading is no longer valid. Similarly to CC application involving nonlinear material behaviors [10,11,12,13], the stress and the energy conditions must therefore be evaluated for several loading levels in order to determine the minimum time t c corresponding to a loading level U c = U (t c ) for which both conditions are simultaneously fulfilled. It reverts to solving the following problem:…”

“…Li and Zhang [57] proposed to enrich the CC with a third parameter representing the roughness of the fracture pattern and thus obtained a better agreement with experimental results. Leite et al [11] performed tensile tests in PMMA specimens containing a circular hole and observed crack initiation using a high speed camera to measure a 700 m/s average velocity. We evaluate herein the influence of considering dynamic instead of quasi-static CC to predict crack initiation in such a configuration.…”

Strength-based regularization length in phase field fracture

“…This approach proved to be a robust and efficient way to predict crack initiation in many configurations such as, e.g., weak or strong singularities, non-singular stress raisers (Weißgraeber et al 2016;Doitrand et al 2020b). Initially developed under small deformation assumption and linear elastic 2D framework, it has since then been extended to 3D (Leguillon et al 2014;Yosibash et al 2016;García et al 2016;Doitrand et al 2018a;Doitrand et al 2018b), to consider material or geometry nonlinearities (Leguillon et al 2017;Li et al 2019;Rosendahl et al 2019;Doitrand et al 2020c;Leite et al 2021), as well as dynamic crack initiation (Doitrand et al 2022;Chao Correas et al 2022). It also revealed efficient for small scale fracture assessment (Doitrand et al 2020a;Gallo et al 2020;Jimenez Alfaro et al 2021).…”

Asymptotic analysis of pore crack initiation near a free edge

“…The CC is computationally efficient since it generally requires only a few linear elastic calculations. It can also account for nonlinearities [8,9,10,11]. The CC efficiency compared to other fracture modeling approach is particularly highlighted in the context of inverse identification approaches of the fracture parameters [12,13].…”