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ashraf3ali
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Join Date: Jul 2009
Location: mumbai, india
Posts: 9

Self-limiting in stresses

11/25/2009 2:21 AM

hello guys,

plz help me to understand the "self-limiting" concept in stresses.

primary stresses are not self-limiting whereas secondary stresses are self-limiting,

but, what is the meaning of self-limiting in stresses??

plz help us with example if you know.

thanks in advance

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Re: Self-limiting in stresses

11/25/2009 2:44 PM

A primary stress (internal pressure) can be analogous to a cantilever beam with a weight on the end. If you put too much weight on it, the beam will continue to bend until it breaks.

A secondary, self-limiting stress (thermal expansion) would be the same cantilever beam, but instead of imposing an over load - you would impose a set displacement/deflection. Such as - the end of the beam is to deflect 0.25". This would be analogous to a cantilever with a support under the opposite end with a 0.25" gap. The difference between the two is that the secondary, self-limiting stress will not "continue on" until failure - it will yield until the distance is taken up and then stop.
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ba/ael
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Join Date: Nov 2007
Location: Sherwood Park, Alberta, Canada
Posts: 1226
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#2

Re: Self-limiting in stresses

11/25/2009 7:31 PM

The attached link discusses the difference between primary and secondary stress in connection with pressure vessel design.

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