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Journal Club August 2010: Deformation Mechanisms in Nanotwinned FCC Metals

Submitted by Yashashree on

Although the nineties witnessed an intensity of research on nanocrystalline metals owing to their ultra-high strength, the early enthusiasm was met with severe disappointment due to their brittle nature and loss of structural stability. In contrast, research over the past few years has provided compelling evidence that nanotwinned structures may be the optimal motifs for the design of both high-strength high-ductility materials.

Phd or Postdoc position on multiscale mechanics in Bochum/Germany

Submitted by Steffen Brinckmann on
job
molecular dynamics
dislocation dynamics

The Interdisciplinary Centre for Advanced Materials Simulation (ICAMS) is a new research centre at the 
Ruhr­University Bochum, Germany. At ICAMS an interdisciplinary team of scientists from engineering, 
materials science, chemistry, physics and mathematics is working on the development and application 
of a new generation of simulation tools for multi­scale materials modelling. 

Modelling a spring shape memory alloy

Submitted by akinbala on
research
Shape Memory Alloys

Hello,

I am a Masters student and I need to model a spring shape memory alloy in ABAQUS. I have found a UMAT file,however the file contains the geometry of a 1X1X1 cube. Does anyone have any idea of how I could copy the geometry of the spring(which i modeled in solidworks and imported to ABAQUS)into the input file of the cube,so that I could run the model in ABAQUS. I have tried this but ABAQUS is giving me errors

Or does anyone have any other idea of how I could model a Sping SMA in ABAQUS?

Thanks

Akin

 

 

Temperature dependence of the thermo-mechanical properties of aluminum

Submitted by omidomid on
research
Temperature dependence ; thermo-mechanical properties ; aluminum

I'm looking for the thermo-mechanical properties of aluminum, such as  Young modulus, thermal expansion coefficient, thermal conductivity coefficient and poisson ratio as a function of temperature :

E=E0(1+E1*T+E2*T^2+E3*T^3)  ;  T: temperature in K

Postdoctoral and Graduate Assistant Positions immediately available in Penn State University

Submitted by liqun on
job

Postdoctoral and Graduate Assistant Positions are

immediately available to work on phase-field simulations of phase

transformations and microstructure evolution in metallic alloys or

oxides. Strong background in mechanics and thermodynamics of of solid

microstructures is a plus. If interested, please email a resume to

Professor Long-Qing Chen, Penn State University at lqc3 [at] psu.edu

For sheet metal forming, how to calculate the shear stress in VUMAT?

Submitted by meshfreer on

 Hello, veryone. I am usint the VUMAT to define a new material behavior. There are questions about the calculation of shear stress.

The sheet metal forming was took as a plane stress problem in many relevant articles. So only three stress components:sigma_{11},sigma_{22},sigma_{12}

(sigma_{33}=0)are included in stress apdate algorithm such as the return mapping algorithm(J.C SIMO, R.L. Taylor. A return mapping algorithm for plane stress

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