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Re: Our 2006 9-3SC is included, No Remedy Available! Posted by EGD [Email]  (#663) [Profile/Gallery]
(more from EGD) on Sun, 14 Feb 2016 07:13:03
In Reply to: Re: Our 2006 9-3SC is included, No Remedy Available!, Tom G  [Profile/Gallery]
, Sun, 14 Feb 2016 05:20:10
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A very broad overview...
Not knowing the design of the part or the materials used, sound design and development practices would have included testing the inflators at various pressures up to and including failure to determine the maximum pressure they could withstand before they destructed, not just up to the pressure needed to inflate the airbags.
If properly instrumented, the test engineers could have determined the pressures at which the metal exceeded its allowable limit elastic strain level (ie limit load, the load below which there is no damage to the metal structure of the part) and the effect of plastic deformation on the part. All of this would be done at a range of temperatures and environments (e.g., possibly salt air per MIL-STD-810).
And at various pressures below and above limit load, the part should have been sectioned and photomicrographs taken at various magnifications to see if microcracking was happening at pressures below limit load. You would do this on hundreds of test specimens to account for various manufacturing inconsistencies and then establish statistically-reduced limit and ultimate strengths of the part.
It's not rocket science but the faster, better, cheaper mentality, along with the preponderance of Chart Boys running programs, has meant that fundamental development processes can be abandoned in the interests of saving schedule time and money.
And all of this depends on accepting that the metal from which the inflators were made was up to standards. Forever ago, counterfeit bolts made from inferior steel were used on an aircraft at my former company. A mad scramble ensued to determine the lower strength of the counterfeit bolts and then every single instance in which that bolt was used was reanalyzed and new, lower margins of safety written. Bolts showing a negative margin of safety were replaced and the others were replaced during heavy maintenance checks.
->Posting last edited on Sun, 14 Feb 2016 07:26:10.
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, Fri, 26 Feb 2016 14:20:40, Mon, 22 Feb 2016 12:51:59, Fri, 26 Feb 2016 10:36:541, Tue, 16 Feb 2016 12:36:15
, Mon, 15 Feb 2016 11:28:02, Mon, 15 Feb 2016 11:32:501, Tue, 16 Feb 2016 09:12:59, Mon, 15 Feb 2016 07:08:46, Tue, 16 Feb 2016 12:40:04, Sat, 5 Mar 2016 12:53:271, Tue, 16 Feb 2016 14:00:43, Mon, 15 Feb 2016 10:04:20, Mon, 15 Feb 2016 10:50:31, Mon, 15 Feb 2016 12:40:34, Sun, 14 Feb 2016 22:32:37
, Mon, 15 Feb 2016 03:05:11, Mon, 15 Feb 2016 09:38:44, Mon, 15 Feb 2016 11:11:12, Tue, 16 Feb 2016 07:30:18, Sun, 14 Feb 2016 09:19:56, Tue, 16 Feb 2016 12:41:21, Sun, 14 Feb 2016 16:09:15, Sun, 14 Feb 2016 17:14:22, Sun, 14 Feb 2016 17:46:34, Mon, 15 Feb 2016 14:18:27
, Sun, 14 Feb 2016 10:50:07, Tue, 10 May 2016 23:50:18, Sun, 14 Feb 2016 04:31:11, Sun, 14 Feb 2016 04:20:19, Sun, 14 Feb 2016 05:20:10, Sun, 14 Feb 2016 09:16:49, Sun, 14 Feb 2016 07:13:03 <-- Viewing This Message, Sat, 13 Feb 2016 18:34:52, Sat, 13 Feb 2016 11:30:43
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