Forum: Reliability & Maintainability Questions and Answers

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Posted by: JJC
Date posted: Fri Nov 17 10:57:34 US/Eastern 2000
Subject: HAST
Message:
What is the significance of increased atmosheric pressure when performing HAST testing at accelerated temperature and humidities.
Thanks

Replies:
HAST Testing
Bruce Dudley Mon Nov 20 10:15:08 US/Eastern 2000

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Posted by: Ian Carmichael (ian.carmichael@kymata.com )
Organization:Kymata Ltd
Date posted: Fri Nov 17 10:11:53 US/Eastern 2000
Subject: ALTA Software
Message:
I am considering attending the reliasoft course for there software packages ALTA and Weibull++.
Can anybody provide feedback on these courses. i.e how good is the software, what is the course content like, what are the benefits etc etc. Thanks for any comments that you have.

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Posted by: JJC
Date posted: Fri Nov 17 10:07:10 US/Eastern 2000
Subject: Defining Accelerated Life Tests
Message:
Can anybody help in defining the conditions for accelerated life tests.
I have a device that is to go through ALT and I would like some information as to how I determine the accelerated conditions that are to be used. Thanks in advance.

Replies:
Accelerated Life Testing
Bruce Dudley Mon Nov 20 9:54:05 US/Eastern 2000

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Posted by: Bob Valerius (robert_m_valerius@md.northgrum.com )
Organization:Northrop-Grumman Oceanic & Naval Systems
Date posted: Thu Nov 16 13:32:36 US/Eastern 2000
Subject: Gasket seal vs. double o-ring seal at low ( less than 4psi) pressure
Message:
Hi
Does anyone have an opinion or data on the relative reliability difference between a gasket seal and a double o-ring seal at low (less than 4psi) pressure for a rectangular battery box that is 28" X 70"? Normally we always use double o-rings but at low pressure there is a concern that it (the pressure) is insufficient to get a good seal for either of the o-rings. Thanks for your time!

Replies:
Low Pressure O-ring /Gasket
Edward Sherwin Thu Nov 30 16:05:38 US/Eastern 2000

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Posted by: Bob Moore (bobbybase@clara.co.uk )
Date posted: Wed Nov 15 11:48:02 US/Eastern 2000
Subject: Sample confidence
Message:
I am manufacturing 3000 components a day, that each have a life requirement of 15 years.
I have a (destructive) screening test that enables me to determine whether samples I test would fail within 15 years. Unfortunately, the test cannot provide failure data indicating failures beyond this point. Therefore the true failure distribution is unknown. How do I determine the number of samples I need to test in order to provide myself with confidence that say, 95% of the day's output will last at least 15 years? Thanks

Replies:
Sample Confidence
Ed Sherwin Wed Nov 15 16:00:56 US/Eastern 2000

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