I hope some of you - particularly those working on strain gradient plasticity or damage and fracture modeling - find this work interesting.
On fracture in finite strain gradient plasticity
http://www.sciencedirect.com/science/article/pii/S074964191500162X
(A pre-print version is available at www.empaneda.com)
Wang, X. et al. High damage tolerance of electrochemically lithiated silicon. Nature Communications 6:8417 doi: 10.1038/ncomms9417 (2015).
Abstract
Shape memory alloys (SMAs) are intermetallic alloys displaying recoverable strains that can be an order of magnitude greater than in traditional alloys due to their capacity to undergo a thermal and/or stress-induced martensitic phase transformation. Since their discovery, the SMA industry has been dominated by products for biomedical applications with geometrically small feature sizes, especially endovascular stents.
The J-integral based criterion is widely used in elastic-plastic fracture mechanics. However, it is not rigorously applicable when plastic unloading appears during crack propagation. One difficulty is that the energy density with plastic unloading in the J-integral cannot be defined unambiguously.
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Dear Colleague,
I would like to inform you that the annual report on the scientific and educational activities carried out by the research unit MUSAM on Multi-scale Analysis of Materials at IMT Lucca during 2014 can be downloaded from the following link:
http://musam.imtlucca.it/Report_2014.pdf
Yours sincerely,
Marco Paggi
I am using Maxps Damage criteria for an XFEM crack for a three point bending case. I am using displacement loading on the specimen and wish to plot reaction load v/s mouth opening displacement. I would like to know how to obtain the crack tip opening displacement in ABAQUS. All the journal papers I read show a slump in reaction force after the crack starts to propagate. I plot the results and contour plots show me clearly that the crack has started to propagate. Please help.
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A new post-doc position (1 year renewable up to 3 years, till the end of the ERC Starting Grant Project CA2PVM, http://musam.imtlucca.it/CA2PVM.html ) is open in the Research Unit MUSAM - Multi-scale Analysis of Materials ( http://musam.imtlucca.it ) directed by Prof.
This work investigates the existing capabilities and limitations in numerical modeling of fracture problems in functionally graded materials (FGMs) by means of the well-known finite element code ABAQUS. Quasi-static crack initiation and growth in planar FGMs is evaluated. Computational results of fracture parameters are compared to experimental results and good agreement is obtained. The importance of the numerical fit of the elastic properties in the FE model is analyzed in depth by means of a sensitivity study and a novel method is presented.
