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Failure Conditions

Failure Conditions

Failure Conditions

(OP)
In looking at failure conditions, should the resulting stresses be compared against Ftu or Fty. Is the criteria different between military and commercial programs.

Thanks.

RE: Failure Conditions

as the FARs direct, after a failure has occurred, the ultimate factor of safety (1.5) doesn't need to be applied.
but your allowables would still be ultimate ...

let's see if this helps ...
before failure    limit load    yield allowables
before failure    ultimate load (=1.5*limit)    ultimate allowables
after failure     limit load    ultimate allowables

RE: Failure Conditions

(OP)
Thanks RB1957 that is what I thought. Can you point me to that paragraph in the FAR (25 I assume).

Thanks again.

RE: Failure Conditions

25.303

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