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First I try to create upper cylinder and the lower part and
rotate the lower parts and merge them, but this create problems in meshing and create gaps between the two parts as illustrated
in the following picture

Determination of Johnson_Cook model parameters

Submitted by Borad M Barkachary on Tue, 02/26/2013 - 06:07

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Hi All

Hope all are doing well. Suppose I have a specimen and I want to find out the Johnson-Cook material model parameters (A, B, C, m, n). Can any one tell me how can I proceed? Experimental or Numerical simulation??

Thanks in advance

Load-displacement curve in static step using Abaqus.

Submitted by digvijay.kumar.singh on Mon, 02/25/2013 - 19:28

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pile foundation

Hi all,

I am working on Abaqus 6.8. I am doing a pile loading
analysis in dense sand. I am not understanding how to plot
load-displacement plot by using static general step. I mean where i
should assign reaction forces and displacement in output request. i have
assigned a set at middle of pile and requested for disp. in output
request also i have made a set of bottom which is fixed and ask for
reation force in output request. i summed up all reaction forces and
combine with displacement. but i am getting zero force and graph becomes

Need help for running UMAT of Dr. Huang's single crystal

Submitted by Soud Choudhury on Mon, 02/25/2013 - 19:03

Hello Everyone,

I am a new member of imechanica. I have started to learn UMAT of Abaqus to model my material behavior ( Cu6Sn5, HCP) using crystal plasticity finite element model. I found Dr. Huang's single crystal UMAT to start learning UMAT and I thought that it would be a great guide to start though it is written for FCC mat. But unfortunately I was not able to run the UMAT with it's input file.

Is it possible to model nonlinear elasticity in ANSYS with SOLID 18x elements?

Submitted by Freeman on Sun, 02/24/2013 - 21:50

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Nonlinear elasticity

ansys

Dear all iMechanicians ,

Since several days I am trying to simulate a granular material very similar to sand. The uniaxial compression test performed to the material shows a nonlinear elasticity behavior during the unloading curve.

The goal is to fully reproduce the behavior of the material with a nonlinear elastic model when the material stress-state is inside the yield surface and the plastic behavior with a multilinear isotropic hardening law. The yield surface would be given by the Drucker-Prager-Cap criterion.