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I am interested in modelling low cycle fatigue damage growth in mild steel using Abaqus. Which model will best suit the ductile damage in steel?

I have the following questions.

1. How to model alloy in LAMMPS? How to automatically randomize the position of atoms of various types?
2. Also how to evaluate the mechanical properties such as Elastic modulus and Fracture toughness?
3. Is it possible to model interface fracture using LAMMPS?

I am looking to generate cohesive elements in a bulk (mesh input). Is there any efficient method/code available using any executable or in MATLAB?

I am building a big model to select some specific elements using Python script in Abaqus Cae. The script runs quickly and the result is as expected in a small model. However, the computational efficiency in a bigger model is very low. The script has run 18 days in a Linux workstation with noGUI command. Are there any methods to set parallel computation in Abaqus cae? Thanks in advance.

Oi!

 I am now using USDFLD to do my simulations. And I need to assign strength, that created by MATLAB, to element 1 to 33.

In the simulation, when the element stress equals the streength failure will happen.

Do you have any idea about how to assign the strength to element? Should I use NOEL or UEL? 

Thank you!

HI , the query is related to FE modelling of 1d Euler bernouli beam for pipe

If a pipe is modeled as a beam ,how can we input or account for the internal pressure of pipe. 

What is the quantity and the direction of nodal loads

Should a load = Pressure x Pipe sec Area be applied to all nodes??

Thank You.

I have been trying to analyse plate buckling by using Static Riks method in abaqus and I have been getting load factors greater than 1 at bifurcation. I have frist carried out the linear perturbation, buckling analysis and I am using its igen modes to introduce imperfections to the non-linear model. I have also defined self contact. Can someone tell me what would be the reason to get higher buckling loads for the non linear case?

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