Eigenstrain in Ansys

8/2/2019 Eigenstrain in Ansys

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Snap back

and snap

through

stresses in a

plate due to

crack

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Residual Stress

Submitted by hamanh on Thu, 2007-07-26

16:15. Computational Mechanics Forumresearch

The thread for residual stress analysis,

measurement

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Residual StressSubmitted by hamanh on Thu, 2007-07-2616:20.

Dear all,

I am trying to construct the existing

residual stress in a structure intoAbaqus V.6.7 so that I can calculate

and consider some structural

behaviour on influence of residual

stress , say fracture process. Does

anyone know how to do this ?!!. I

have some knowledge of eigenstrain

concept but I do not know the way to

implement it into commercial code

Abaqus.

All help or even hints are appreciated

very much

regards

Hamanh

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Is it prestress?Submitted by Ying Li onThu, 2007-07-26 17:38.

Is it a prestress like

in the steel

concrete? It can be easily used in

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For residual stress inSubmitted by Michael P. ODay on Thu,2007-07-26 17:48.

For residual stress in abaqus, before

defining the load steps, you can use

the following keyword:

*Initial conditions, type=stress

, residual Sxx

value, residual Syy value

Mike


comments

Eigenstrain inAbaqusSubmitted by Joe Kelleheron Fri, 2007-07-27 10:34.

I don't think Abaquswill let you specify

eigenstrain directly, or at least it didn't

when I last looked at this problem.

You can achieve the same effect using

thermal expansions, however. At each

point that you know eigenstrain,

specify the direction-dependent

thermal expansion coefficients to be

the relevant components of

eigenstrain, then raise the

temperature of your model by one

degree. The stress due to thermalstrain misfit should then behave the

same as 'real' residual stress with

regard to stress redistribution on

cutting or cracking etc.

I don't know if and how the fracture

mechanics parameters take this misfit

stress into account. Also I've not

experimented with the 'Initial

Conditions' type of residual stress

either, and I'm not sure what physical

aspects of a residual stress field thissimulates. I'd be interested to know

about both.

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Thank you for yourSubmitted by hamanh on Fri, 2007-07-2713:25.

Thank you for your replies,

I have already used thekeyword: *initial condition,type=stress andtype=outputfile for creatingresidual stress fields. Itworks well.

I also tested by usingalternative thermal stresswith isotropic and anisotropic

thermal expansion factorsbut the obtained result wereout of control (the valuesand distribution of thermalstress are different than itshould be...) even I spent alot of time. So I do believethat I should go on byFORMAL way in which theproblem of eigenstrain mustbe formulated in consistent

with Abaqus. I am wonderingif someone already hasexperience on this !!?.

Concerning the aspects ofresidual stress, in myopinion, is is very worldwideand interesting, we can findthis in every branches ofMechanics...As far as I knowthe residual stress makes big

influence on Britle Fracturebut less on Ductile Fracture,also Residual stress cancreate the influence ontriaxility in Fractureproblems.


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Residual stressSubmitted by Mingji Wang on Sat,2007-07-28 02:19.

The residual stress should have a

physical cause. It should be better to

used ABAQUS to generate it through

STEP simulation rather than

specifying. The residual stree

prescribed by initial condition canbe nonequilibrium. If this is the case,

ABAQUS will find a

'dstorted' equilibrium state in the

following step analysis.


comments

Equilibrium underresidualSubmitted by Soufiene on Mon,2007-09-03 11:38.

As you said Abaqus will seek for

an equilibrium during the step.

But, how can we simulate the

distortion with free boundary

conditions?

We should introduce some

boundary conditions in the model

in order to avoid numericalsingularities. But this will result in

a non-physical distorded shape.


comments

Residual stressSubmitted by Mingji Wang on Tue,2007-09-04 00:36.

If it is free boundary, noresidual/plastic deformation orstatically determined structure, thenI assume there must be sominhomogeneity in either tempatureor solvent absorption. Otherwise, asyou pointed, there will be noresidual stress.

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ThanksSubmitted by hessamvalidi on


7 3/5/2012 5:02 P


5/7

Mon, 2008-06-23 07:06.

Hi,

I used this keywords, "*Initial conditions,

type=stress" to define residual stress on a

region on my model.

can i define node set instead of element set?

and how can i exert a parabolic distributionof residual stress in the region?

Thanks


comments

Residual stress generationSubmitted by crazycolor on Mon, 2008-06-23

15:26.

Hi,

i am new to abaqus software. i just

want to ask how can i generate the

residual stresses using thermal

expansion coefficients using Abaqus

software ( a little about procedure)

and secondly i just want to use thses

calculated residual stress state as an

intial condition for my tensile test how

can i used that analysis as an intial

step for tensile test.

thanks in advance


comments

contact in fswSubmitted by hamedjam on Sat, 2008-10-2520:00.

Hi

i have a problem in definition of

contact of tool and workpace in fsw.

when define contact i dont have any

heat generation result in friction

between tool and workpace!!!!

please help me.


comments

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comments

RESIDUALSTRESSSubmitted by ennio curto on

Tue, 2010-01-05 20:09.

NEWTECHNIQUE FORRESIDUAL STRESS

MEASUREMENT NDT p.i.Ennio Curto. TECHNICALPAPER This type ofnon-destructive method NDTprovides the possibility tomeasure residual stress and the

effect of the service load withan impact device and a vibrationmeasurement sensor. Internalstresses are to be considered asthe following: 1) Operationalstrains referring to loads thatthe material is subject andcalculated 2) Residual stressesin the material caused by heattreatments or stresses caused by

welding, forging, casting, etc.The new technique is able tomeasure the applied load andresidual stress that are balancedon the surface of the material,and in a relatively large volume,at times even the same size asthe entire structures. This stressis part of the metals elasticityfield and has a three axis spatial

orientation. The system worksthrough the accelerometermounted with a magnetic baseto generate the acceleration


7 3/5/2012 5:02 P


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value of the vibrations createdby the device impacting on themetal surface. The accelerationvalue, in combination withother parameters, permitsobtaining the exact value of theresidual stress or load applied

in the desired point. This valuewill appear on the displaydirectly in N / mm . Fornon-magnetic metals, wax or gelwill be used to mount theaccelerometer.This new system,for buildings, bridges steelinspection is very simple for touse , portable ,measure exactvalues of residual stress due to

welding and the applied loads.After many years of researchand tests, and between ediscover about elastics behaviorin field of metal steel now isvery practice inspection point topoint building and bridgeconstructions. This new systemlet bridges steel inspection invery simple mode, is portable

instrument and let to measureexact values of residual stressdue to welding and the appliedloads.


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