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non linear buckling analysis on a pipeline using ansys

Submitted by sreesarinvs on
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non linear buckling analysis using ansys on a pipe

Hi,

I am doing buckling analysis of a pipe with liner inside it. I did eigen buckling on the problem. buckling pressure from my calculation is 15.83Mpa  and from ansys it is 15.19Mpa, so I am pretty happy with that. But i would like to do nonlinear buckling analysis on the same problem as a part of my project.

 

can anyone suggest how to do it using ansys 12,mechanical apdl

Thanks

UMAT in ABAQUS

Submitted by augustus on
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Computational Mechanics Forum
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viscoelasticity
Nonlinear UEL and UMAT

Hi,

I've been learning how to implement material models using UMAT in ABAQUS and I have

some simple questions:

 

I've been trying to implement the viscoelastic models in the paper:

Formulation and implementation of three-dimensional viscoelasticity at small and finite strains

Kaliske, M.; Rothert, H., Computational Mechanics, Volume 19, Issue 3, pp. 228-239 (1997) .

 

1) The variable "STRAN" in UMAT corresponds to the strain at time $t = t_n$ or $t = t_(n+1)$,

how to mesh AC3D4 acoustic tetrahedral

Submitted by elyartab on
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ABAQUS
meshing

im working on an abaqus model which should be meshed by AC3D4 acoustic tetrahedral elements.

 i attached the picture of main meshed model and my model .

but there is a difference between them. ( i pointed them by white areas)

  

how can i mesh o control mesh to create that kind of meshing

 

 top model is mine and bottom is original model.

 

tnx

 

 

Finite-Element Analysis of Current-Induced Thermal Stress n a Conducting Sphere

Submitted by hasanzhong on
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plastic deformation
Pb-free solder
electronic interconnects
finite-element modeling

Understanding the electrothermal-mechanical behavior of electronic inter-

connects is of practical importance in improving the structural reliability of

electronic devices. In this work, we use the finite-element method to analyze

the Joule-heating-induced thermomechanical deformation of a metallic sphere

that is sandwiched between two rigid plates. The deformation behavior of the

sphere is elastic–perfectly plastic with Young’s modulus and yield stress

decreasing with temperature. The mechanical stresses created by Joule

Thermodynamic model for strain-induced crystallization in rubber - Eccomas

Submitted by Joachim Guilie on
research
rubber
Constitutive model
Micro-sphere
Strain induced crystallization
Cyclic
Cristallisation sous contrainte

Natural rubber (NR) is known to crystallize under strain (SIC) so that NR samples subjected to loading-unloading cycles exhibit hysteresis. A brief review of the numerous experiments conducted on this material is given. Detailed information on the microstructure is therefore available, particularly simultaneous measurements of stress versus elongation and

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