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Isotropic hardening and kinematic hardening

Submitted by kajalschopra on
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Computational Mechanics Forum

I've been trying to figure out difference between isotropic and kinematic hardening.

As I see,kinematic hardening can model reversible nbehaviour of metals (Bauschinger effect).

In isotropic hardening, the yield surface increase in size, but remain the same shape, as a result of plastic straining.

That is, if the yield surface is represented by a cylinder of radius "A" then an increase in the radius denotes an increase in the yield stress as a result of plastic straining.

Basics of plasticity-Crisfield's book

Submitted by bruno-page on
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Computational Mechanics Forum

Hi-I'm currently reading the chapter 6 on Basic plasticity from the book by Crisfield on Non Linear Finite element analysis and am finding it a bit too hard  to understand things but am determined to get it right.

I shall be extremely grateful if anyone can help me understand  few introductory sections and I hope once that,I could follow the correct path.

For example, in the introductory paragraphs he states that:

1. The main objective of the present chapter is to concentrate on those aspects that relate to a numerical solution.

Pressurized Cylinder FEM constraint

Submitted by fernando.romagnoli on
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Computational Mechanics Forum

Dears,

 

I have a cylinder subjected to an internal pressure of 10 MPa, the cylinder diameter is 1400 mm. I am trying to model it in my FEMAP. I am comparing the average stress (TOP and BOT Y) with the stress that come from the formula

hoop_stress=pressure.Radius/thickness

The stress I obtained is similar with the one that is from the formula, but the deformed is not equal, it is crazy !

Non linear finite element analysis

Submitted by kajalschopra on
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Computational Mechanics Forum

Hi,

I've been reading the book by Crisfield on Non linear Finite elment analysis-Volume 1

Basically, I've been reading the first 4 chapters as of now which can be summarized as follows:-

So far in Crisfield’s book, following has been covered/ done: 

  1. Chapter 1 of Crisfield’s book gives an introduction to geometric non linearity. The concept of incremental method, Newton Raphson method and combined Newton Raphson are introduced through a single variable problem considering a shallow truss.

 

How to incorporate 3d models from vtk onto FEM packages?..is there any particular package which supports them?

Submitted by Bhaskar.R on
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Computational Mechanics Forum

Hi friends,

I would like to know whether there is a particular FEA package which
would incorporate 3d models from vtk on to it, say for example if
abaqus incorporates it how do we do it?. Can you please help me in this
regard?

 

Bhaskar.R

How to Transfering Results from Abaqus/Explicit analysis to Abaqus/Standard

Submitted by lizheng619 on
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Computational Mechanics Forum
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How to Transfering Results from Abaqus/Explicit analysis

How to Transfering Results from Abaqus/Explicit analysis

Dear all,

        Now I am on a research, and it is divided into two stage: (a)Abaqus/Explicit analysis

and (b) importing the results in the first Abaqus/Explicit analysis to do Abaqus/Standard

analysis.

        But in the process of importing results, there are some problems. The parts built in

the first stage can not be imported.

Viscoelastic Abaqus Analysis question please help

Submitted by hdayanan on
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Computational Mechanics Forum

Hi Everyone,

I am new to thermal viscosity analysis, here is the data I have received.

 

DMA data which has Temp, Shear Storage Modules, Shear Loss Modules,  Tan Delta, Calculated Modules, Temp was raised at 5 deg/Min

I want to do a thermal analysis where the part is heated upto 90 deg for 1 hr, returned to room temp and cooled 2 hours.

 How can i simulate this in abaqus ..? I want to incorporate the Viscosity data from the DMA data. I also have received  thermal conductivity, thermal expansion and specific heat data.

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