Using FE to determine residual stresses

[Jlog50]

Hello all,

I was wondering if anyone has any experience of guidance on using FE (I am using Abaqus in particular) to study residual stress in a component between cyclic loading. Also, is there any material out there with examples?

Thanks

 

[corus]

Any material will have residual stresses if you take it above its yield stress. Just apply a load to yield it, then remove the load. Simples.

Tata but not yet tara

 

[adamuk]

Apologies for hijacking this thread but it's easy to spot the UK posters.. Simples!

Adam Potter MEng CEng MIMechE

http://www.ax-ea.co.uk

 

[Jlog50]

Thanks very much for your "simples" responses

So would you say that if a material behaves elastically then it will not experience residual stresses? I am specifically looking at shakedown theory.

Thanks

 

[adamuk]

If the material remains below yield then it will behave elastically unless you are in the creep range. Beware that some components can potentially have residual stresses as high as yield if they are welded (see BS7910 appendix Q for example)

Adam Potter MEng CEng MIMechE

http://www.ax-ea.co.uk

 

[corus]

Shakedown occurs when the (elastically) calculated thermal plus mechanical stress range (primary plus secondary stress range) is within twice yield, whereupon the stresses cycle within the elastic range. I presume in that that the mechanical stresses alone must be within yield. To study this you'd need to have perfectly plastic material behaviour in your model, and loads that included secondary stresses from applied temperatures.
Have a look in pressure vessel design standards such as BS5500 or EN13445, or ASME something, for the definition. It's not so simples.

Tata but not yet tara

 

[kmarch]

i have similar your problems but specifies the creep model such as Power law multiplier, Eq stress order, Time order for abaqus
please recommend me.
Thnak you