ASME　ｐｒｅｓｓｕｒｅ　ｖｅｓｓｅｌ　section VIII division 2

Hi, everyone,

I am wondering whether anybody could explain how to determine primary stress and secondary stress when FE software is used when the pressure vessel is designed using ASME section VIII vision 2.

The code has some explanation using plasticity (self-limiting). But it is very hard to use for practical use.

Thanks