SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: Bob Valerius
Organization:Northrop-Grumman Oceanic & Naval Sys
Date posted: Mon Feb 14 15:15:24 US/Eastern 2000
Subject: Failure model for a metal bellows
I am trying to find a failure rate model similar to other mechanical models in the Carderock mechanical reliability handbook. I realize that NPRD-95 has a couple of data points for bellows but they are GF environment (ours is naval unsheltered) and the failure rate is given independent of number of cycles, material, etc. I would expect those parameters to play a large part in the failure of a bellows. Thanks for your time.
Subject: Reliability Conversion
Reply Posted by: Bruce Dudley
Organization: Reliability Analysis Center
Date Posted: Thu Feb 17 15:02:34 US/Eastern 2000
Suggest that you use the conversion approximations that are cited in the Reliability Engineers' Toolkit on page 176. Using the factors from this table, one would multiply the MTBF at ground fixed conditions by 0.3 to obtain a conversion at naval unsheltered conditions.