Sharing a new article "Finite element implementation of Field Crack Mechanics for brittle and ductile fracture" by my Ph.D. student BVSS Bharadwaja at IIT Bombay, which has been accepted for publication in Theoretical and Applied Fracture Mechanics. Also see attached. Thanks to Prof. Amit Acharya for the motivation and discussion.
Hi I tried to code a basic phase field model for fracture in octave.
It doesn't seem to converge to the correct load. It fails later.
Also mesh refinement did not improve the results.
The link to the GIT is here
https://github.com/dontcallmesuren/Phase-field-modelling.git
Any idea where I am wrong?
Ping me. Thanks in advance.
The Journal Club for April 2021 presents a concise review of the so-called variational phase-field fracture theory for brittle and cohesive fracture. Topics include the pioneering work of Griffith on brittle fracture in 1920, Barenblatt's cohesive zone model in 1959, to Marigo/Francfort's variational formulation of Griffith's brittle fracture 78 years later and the Bourdin's phase-field regularisation of MF's model. Also discussed is recent models for cohesive fracture, the role of the length scale parameter, solver for the coupled PDEs and some applications.
Several models have been developed over the past decades to capture the fracture and failure of ceramic materials. JH2, JHB models are widely used for simulating the behavior of armor plates upon ballistic impact. I have a doubt regarding these models. Are these models only valid when the impact velocity is in the order of 1000m/s, as under such circumstances material transitions from elastic to elastic-plastic regime defined by the HEL Pressure? But what about when the impact velocity of the ceramic is around 300-400 m/s (a fraction of ballistic impact)?
Could cellular automata be used to model mechanisms (for quasi-brittle fracture) that occur at the meso-scale and then feed these mechanisms to a macro-scale finite element model? Is it possible to replace constitutive models with mechanistic models, simulating mechanisms that lead to fracture instead of formulating equations that predict failure? These are typical questions that have motivated my recent collaboration with Dr Anton Shterenlikht at the University of Bristol.
A Postdoctoral fellowship is available at The Johns Hopkins University, Baltimore, U.S.A. in the area of fracture and fragmentation under dynamic loading conditions. The potential candidate should have a Ph.D. in an engineering discipline, a strong background in fracture mechanics and extensive computational modeling experience working with the finite element methods or some other numerical method with application to solid mechanics.
The word "extreme" seems to be "trending" a lot these days, see the recent discussions on the new journal Extreme Mechanics Letters.
My collaborator Ruben Sevilla at Swansea and I were interested in very curved crack paths that develop in nature and have been replicated experimentally in thin films attached to elastic substrates.
Adv. Funct. Mater. DOI: 10.1002/adfm.201101224
Hi, everyone.
It's very nice to find the home for mechanicians and I'd like to make friends with all the persons who enjoy the research in the mechanics of material.
My chinese name is Zhigang Yao, and english name is Zealgang Yao. So you can choose any one you'd like to.
I found an interesting paper on the arXiv website that may interest some mechanicians. Markus
Title: Brittle fracture down to femto-Joules — and below
Authors: J. Astrom, P.C.F. Di Stefano, F. Probst, L. Stodolsky, J. Timonen
