Hi guys and girls!
I am currently trying to learn how to do fracture mechanics assessments via FEAs and API 579 (fitness for service). The first challenge I have come across is implementing a stress field to simulate the residual stresses present near weldments.
What is the best way to implement a residual stress field for fracture mechanics assessments via FEAs? Thermal analysis? Other ways?
As a simple case, I've created a sample problem (quarter section shell with head, semi elliptic inside crack). A region of the shell is to be assigned residual stresses. To start, I'd like to assign a small value of tension in this section (say, about 50 MPa). What is the best way to do this, conceptually?
If you want to tag along; I'm using ANSYS. I've created a simple example file here:ANSYS file
@David SegletesThank you so much for your answer.
Indeed, there are numerous papers in the literature on the topic with great depth and detail to how to compute residual stresses. My impression from the research papers is that they are just that (research papers), and delve into great detail etc. However, what I am looking for is a more practical approach to solve fracture mechanical problems. API 579-1 indeed provides normative through-wall stress distributions to be used. I'm more on the lookout for how to actually solve a given problem. But maybe there is none other than a comprehensive welding simulation? Maybe I can contact one of the people you mentioned to delve deeper?
Thank you for your time.
ASM International is the world's largest association of materials-centric engineers and scientists. We are dedicated to informing, educating, and connecting the materials community to solve problems and stimulate innovation around the world.
ASM World Headquarters9639 Kinsman RoadMaterials Park, OH 44073-0002
+1 440.462.0292 (International)