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Help modeling a viscoelastic material in Abaqus

Submitted by Arnold Feng on
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abaqus indentation viscoelastic

Hello,

I'm trying to model indentation of a viscoelastic material in Abaqus.

I have (1) stress-relaxation curves for the material and (2) force-displacement curves for the material from a real indentation experiment.

From this I can readily calculate the elastic modulus (infinite) and the elastic modulus (instantaneous) for the material.

I'd like to fit a Prony series based on this data that I can enter into Abaqus to model the material.

How would I go about fitting the Prony series from the force-displacement and stress-relaxation curves?

how to show the stress in the thickness direction when you use the shell element with abaqus

Submitted by hua_2001 on
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stress
ABAQUS

hello,

  •      i simulate some process using shell elment, i find the results have big difference between abaqus and lsdyna. the abaqus results always show the stress in the thickness direction is zero. but the lsdyna is not. i don't know why? if some one know that, please give me some suggestions. i heard that the abaqus can not show that stress component. if not, how can i do to calculate that and fill it into the results file (.fil file). thank you!

 

Problem with my Abaqus Double Layer Composite Identation Simulation

Submitted by cvs599 on
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Hi everyone,

 

I currently using Abaqus/CAE 6.8. I currently doing my final year
project about indentation test on double layer composite material. The
top layer of the material is Pasta (elastic) and bottom layer is Gel
(hyperelastic). I manage to simulate the model and completed the
process. The stress of the Gel does not change as it undergoes
deformation. As shown in the clip i attached. Any idea to solve this
problem? Any suggestion is welcomed.. Thanks

Right click the indentation.jpg and save target as....

Nonlinear Analysis

Submitted by J. P. B. N. Derks on
education

Hello,In order to nurture you in an effective manner regarding the Newton-Raphson method I recommend you to consult the excellent treatise of I. M. Smith et al. entitled "Numerical Methods for Engineers ", ISBN-13: 9781584884019.Furthermore this method is elegantly elaborated in Finite Element Formulation in the outstanding book of I. M. Smith indicated as "Programming the Finite Element Method ", ISBN-13: 9780470849705.In addition the geometrical nonlinear formulation is transparantly and completely detailed in the famous book of W. F. Chen et al.

boundary value problems

Submitted by iangill on
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Computational Mechanics Forum
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stress analysis

Hi All, thanks in advance for any replies.

I am currently doing my Thesis on fast stress analysis using the boundary element method and specifically, adaptive cross approximation. I ofter come across the terms "single layer potential" and "double layer potential", i "know" what they are mathematically, i was wondering if anyone could give me an insight into what they mean physically, or just give a simple non mathematical definition? Thanks a lot, Ian.

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