Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Results Subarea: Original Author: Bentley Technical Support Group Comments, Questions, and Answers: Item #1: AutoPipe calculates the thermal range ratchet for that attached model as(9.48) for nodes 20,21,30 etc Doing the hand calculation for the thermal range ratchet the number is 193.48 see attached calculation. Would you please let me know why there is such difference? Answer: Readers of this wiki article should be warned that the following answer to the above question is per a specific model and set of Stress Summary settings and may not apply to your situation. 1. User is trying to confirm results for T19 and T20 only. However, in his stress summary he has quite a number of load pairs defined. This will result in the stress summary only displaying the worst case scenario i.e. one resulting in maximum stress ratio. 2. In the calculations the user sent, he is using psig instead of psi as defined in AutoPIPE model. therefore, the calculated value x is wrong. 3. The results given out by Stress Ratchet are using the minimum Sy value. The code requires to use average value for Syt from the two transients. However, the CAE development team has decided to use the minimum instead. This is conservative in nature. Workaround, adjust the had calculations accordingly to consider the min value to match output results. 4. The program can provide the results for T19 and T20 only by removing all load pairs in stress summary 2. This will show the ratchet results (using the minimum yield from T19 and T20) in the output report. See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!
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