Residual stress simulation on Ansys

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Discussion Overview

The discussion revolves around simulating the effects of residual stress on structures using ANSYS. Participants explore various types of residual stresses, including those from loading, welding, and machining, and seek methods to model these effects in simulations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants inquire about the definition of residual stress, with suggestions that it may refer to stresses from exceeding yield strength or from processes like welding.
  • One approach proposed involves conducting an inelastic analysis using the Multilinear Kinematic model, followed by a load removal step to observe residual stresses.
  • Another participant suggests modeling weld beads and performing thermal expansion/contraction analysis to account for residual stresses from welding.
  • A participant expresses interest in the general effects of residual stress on structural integrity and seeks to support their literature review with computer simulations in ANSYS.
  • There is a discussion about residual stress resulting from repeated loading leading to material failure, with emphasis on examining stresses and strains over cycles.
  • A later post raises a specific issue regarding the export of deformed bodies with residual stresses for further static analysis, indicating a need for continuity in modeling.
  • Another participant seeks guidance on simulating planar residual stress caused by machining.
  • One participant asks about modeling weld residual stress specifically for K-Joint Tubular Joints in ANSYS.

Areas of Agreement / Disagreement

Participants express varying definitions and approaches to modeling residual stress, indicating that multiple competing views remain. The discussion does not reach a consensus on a singular method or understanding.

Contextual Notes

Participants mention different types of residual stresses and their origins, but the discussion lacks clarity on specific assumptions or definitions that may affect the modeling approaches suggested.

Who May Find This Useful

Individuals interested in structural integrity analysis, residual stress modeling, and those using ANSYS for simulations in engineering contexts may find this discussion relevant.

weezy.darwin!
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Hello,

Just wondering how the effect of residual stress on any structure can be shown on ANSYS, any information will be appreciated!
 
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By residual stress do you mean like unloaded stress from a part that has exceeded the yield strength?

If so, then you'll need to do an inelastic analysis by defining material properties using something like the Multilinear Kinematic model, and then performing the fully load analysis. Then, create an additional load step and remove the loads, and solve again.
 
If you mean residual stresses from a welding process, you need to model the weld beads (or weld "region") and do a thermal expansion/contraction analysis.

Basically there is no simple solution, and our answer will depend on what kind of residual stresses you're referring to.
 
oh okay, that's helpful. i really appreciate it.
 
Really i am generally looking into the "effect of residual stress on structural integrity", haven done the literature review and all, i was looking to back it up with a little not too complicated computer simulation to show this effects through ANSYS ...hope that explains it better.
 
Last edited:
Residual stress caused by what?
 
Residual stress caused by loading or reapeated loading leading to th material failure.
 
Ah, that's much better. Then the residual stress is due to stresses above yield strength of the material.

See my post above for an inelastic analysis. Typically, you will run one cycle, and examine the stresses/strains and look on LCF curves or the like to determine life.
 
minger said:
Ah, that's much better. Then the residual stress is due to stresses above yield strength of the material.

See my post above for an inelastic analysis. Typically, you will run one cycle, and examine the stresses/strains and look on LCF curves or the like to determine life.

Sorry for bumping this thread,but I've got a similar problem! I have a structure and did apply load in one loadstep, and the unloaded it in a second. The materialmodel is miso.
Is there some way to "export", or use, that deformed body with its res-stresses to an another Static structure analysis? I want to apply other boundery-conditions and some other loads.

Basically I first stamps/presses a steel plate, and then use that plat in an another construction, and I want to bring with the influence of the res-stresses and material hardening.

Best reg Henrik
 
  • #10
Hi
I want to simulate residual stress caused by machining , in fact i need to simulate a planar residual stress.

thanks in advance.
 
  • #11
How can I model weld residual stress for K-Joint Tubular Joints in ANSYS?
 

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