Fatigue Analysis for Cyclic Service Div.1
Fatigue Analysis for Cyclic Service Div.1
(OP)
Hi all. This is my first post, so go easy on me if I violate any forum protocols. I have a simple Section VIII Div.1 pressure vessel that will operate in cyclic service. I would like to perform a Fatigue Analysis as per the rules of Div.2, AD-160 Fatigue Evaluation, Appendix 4 Stress Analysis, and Appendix 5 Fatigue Analysis. I have refered to Appendix G Examples of Formulas and Rules and feel somewhat comfortable analyizing the shell. However, I am drawing a complete blank with finding proper formulas and methods to analyze the heads, nozzles, and thermal conditions. Can anyone offer perhaps a set of "sample" calculations that I could mimic, or offer some guidance as to where to find the proper forumlas? Any and all input will be greatly appreciated, I look forward to your responses.





RE: Fatigue Analysis for Cyclic Service Div.1
RE: Fatigue Analysis for Cyclic Service Div.1
I did find this. I have been thinking about buying it:
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Description
Order #: H00967
ISBN #: 0791813355
Published: 1995
Product Type: Print-Book
No. of pages: 596
ASME/JSME Pressure Vessels and Piping Conference, July 23-27, 1995, Honolulu, Hawaii. Compilation of papers illustrate application of fatigue and fracture mechanics techniques to assess the structural integrity of a wide variety of pressure vessel and piping components. Focus is on fatigue and fracture in vessels, piping, and material property evaluations; constraint effects in fracture mechanics; probabilistic fracture mechanics anaylses; user's experience with failure assesment diagrams. @By: H.S. Mehta, et al
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RE: Fatigue Analysis for Cyclic Service Div.1
RE: Fatigue Analysis for Cyclic Service Div.1
TECHNICAL REFERENCE API 579 Fatigue Analysis for Cyclic Service.
RE: Fatigue Analysis for Cyclic Service Div.1
The ASME sect VIII div 2 method was derived from methods based on manual calculations and simple bodies , as commonly done in the 1950's. It is difficult to finagle the results of a nonlinear finite element analysis into the format used by ASME sect VIII. I think ASME now allows the alternative use of the PED, and this may be part of a reciprical agreement with the EU to encourage the EU to accept the ASME code in other cases. Privately, I suspect the ASME may directly adopt the EU PED fatigue methods soon.
RE: Fatigue Analysis for Cyclic Service Div.1
I really doubt that the Pressure Vessels and Piping conference volume will provide the guidance you're looking for. There's a Fatigue and Fracture track at each PVP conference so buying a 10 year old volume may not make the most sense. You can check out the papers from last year's F&F track at http:/
In general, I'd agree that there is little written material on how to apply the code rules for fatigue in design of new equipment. I was taught the old fashioned way, by a couple of guys with a combined 50+ years experience mentoring me for several years. I guess my generalized guidance would be to not worry about the shell and heads, worry about the details like the nozzle to shell intersections and ladder and platform clips etc. Minimize attachments and avoid fillet welds (full pen with fillet is ok). Use integrally reinforced nozzles or insert plates (locally thicker shell sections). Etc. etc. If the details work, the major components will also tend to work.
jt
RE: Fatigue Analysis for Cyclic Service Div.1