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brittle fracture

Which is the best model to capture brittle fracture and failure of ceramics at moderate velocities?

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)?

Cellular Automata for Multi-scale Fracture

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.

ndaphalapurkar's picture

Postdoc position – Modeling dynamic fracture and fragmentation

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.

Ettore Barbieri's picture

Extremely Curved Cracks

 

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.

May I introduce Zealgang to you?

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'm a student from Institute of Metal Research (IMR), Chinese Academy of Sciences(CAS). My major is about the brittle fracture of the semicondutor crystals. So I'd like to communicate to all of you who insterested in this topic.

Markus J. Buehler's picture

Brittle fracture down to femto-Joules — and below

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 

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