On an equation from the theory of field dislocation mechanics
Luc Tartar and Amit Acharya
Bulletin of the Italian Mathematical Union, (9)IV, 409-444, 2011
Plasticity
Controversy: Dynamic Peierls-Nabarro equations
In 2010, Yves-Patrick Pellegrini published a paper in Physical Review B called
Dynamic Peierls-Nabarro equations for elastically isotropic crystals. with the abstract
CISM Course: Plasticity and Beyond
Dear all,
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The link is:
http://www.cism.it/courses/C1104/
Flyer is attached.
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Original post from CISM website:
Plotting the Johnson-Cook strength model
I'm trying to plot the stress-strain curve described by the Johnson-Cook strength (and eventually damage) models. The strength model is defined as:
σ=[A+Bεn][1+C ln(ε_dot*)][1-T*m]
where A, B, C, n, and m are material constants, ε_dot* is the non-dimensionalized strain rate, and T* is the homologous temperature where T*=(T-T0)/(Tmelt-T0)
Variable Elasticity (Young) Modulus
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I need to simulate a sheet forming but I must consider the variation of Young modulus with plastic strain.
Has anybody tried this? How can I implement a function for this? I have never worked with UMAT / VUMAT.
Thank you.
Surface mediated plasticity in sub-10-nm-sized gold crystals
Although deformation processes in submicron-sized metallic crystals are
well documented, the direct observation of deformation mechanisms in
crystals with dimensions below the sub-10-nm range is currently lacking.
Here, through in situ high-resolution transmission electron
microscopy (HRTEM) observations, we show that (1) in sharp contrast to
what happens in bulk materials, in which plasticity is mediated by
dislocation emission from Frank-Read sources and multiplication, partial
dislocations emitted from free surfaces dominate the deformation of