Previous in Forum: Torque calculation   Next in Forum: Welding 668 Class B Pins and Steel Vessels
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
2 comments
Rate Comments: Nested
paresh_career001
Power-User

Join Date: Oct 2008
Location: Gujarat, India
Posts: 142

Stress Classification Lines (SCL)

05/11/2009 1:17 PM

I have performed FEA of radial nozzle in Hemispherical head. after FEA i have taken SCL at different loacations. As I am STUDENT, i am guided by one of the engineer. and he tells me to take SCL at following locations. Now for BOUNDARY CONDITIONS Like : ((( Temperature + nozzle loads + operating pressure )))...then what category type of stress will generate in following locations as shown.....my friend think stress generated will be of ( PL + Q ) Why ? i dont know the reason why? I have read the definitions but dont understand it....

__________________
 Paresh B. Gujarati
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
XMech
Power-User

Join Date: Jan 2009
Location: Western Canada
Posts: 295
Good Answers: 51
#1

Re: Stress Classification Lines (SCL)

05/11/2009 6:39 PM

Please read section 5.2 "Protection Against Plastic Collapse"

Plus, 5.6 "Supplemental Requirements for Stress Classification in Nozzle Necks"

and lastly - Annex 5A "Linearization of Stress Results for Stress Classification"

__________________
 A little knowledge is a dangerous thing.
Register to Reply
Anonymous Poster
#2

Re: Stress Classification Lines (SCL)

06/02/2009 2:00 PM

SEE IF YOU RUNNING ANALYSIS SOFTWARE YOU WILL READILY SEE THE STRESS ALONG THESE PATH

gENERALLY IN SUCH CONDITION STRESSES DEVELOPED ARE

1. PRIMARY MEMBRANE STRESS (pm)allowable limit is 1Sm

2. LOCal membrane (pl)allowable limit is 1.5Sm

3.Local Membrane+ bending (pl+pb) allowable limit is 1.5Sm

4. secondary stress (pm+pl+pb) (self limiting vanishes on yeilding) allowable limit is 3Sm

5.peak stresses(Q) due to change in geometry or discountunity allowable limit is 3Sm

these type of stresses will developed in shell
Register to Reply
Register to Reply
Have a Different Question?
2 comments

Previous in Forum: Torque calculation   Next in Forum: Welding 668 Class B Pins and Steel Vessels

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Manufacturing:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (74 right now)
Show Members
Advertisement