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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

2D Contact Problem In AINDA84

Submitted by chenjinghao on
research
2D contact problem adina84

ADINA84 is an open source code which can solve contact problem.

My model is shown in the picture below：

 

Pipeline and seabed are both 2D 2-node beam element and seabed is rigid surface.

I define one contact pair,two contact surface and each surface has 99 nodes .Two surface's nodes have same coordinate.

The program'erro is"CONDITIONS OF CONTACT INADMISSIBLE DUE TO DETECTION OF GROSS OVERLAP".

 Who can tell me the reason？

Several questions for VUMAT

Submitted by meshfreer on

Hi all, I am a new ABAQUS VUMAT user. I am defining the material behavior in stamping of sheet metal through VUMAT. But there are several questions about VUMAT.



（1）accoring to the ABAQUS user manual，for plane stress problem，stressnew(nblock,ndir+nshr), where ndir=3,nshr=1, but in fact,there are 5 stress commponents: sigma_{11},sigma_{22},sigma_{12},sigma_{23},sigma_{31}.

how to match stressnew(*,i)(i=1,2,3,4) with the stress commponents: sigma_{11},sigma_{22},sigma_{12},sigma_{23},sigma_{31}?

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