Theories of failure and tensile testing

AI Thread Summary
The discussion centers on the limitations of 1-D tensile testing in developing theories of failure, questioning why 2-D and 3-D testing are not more commonly utilized. Participants highlight the importance of understanding fatigue and how geometric shapes can concentrate stress, leading to failure. Recent research on the behavior of bent spaghetti illustrates how pre-stressing can influence failure modes, suggesting that more complex testing could yield valuable insights. The conversation emphasizes the need for practical testing methods to better understand multi-dimensional failure stresses. Overall, the exploration of these theories and testing methods could enhance material science and engineering applications.
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Why theories of failure have been developed from 1-D tensile testing. Why can't we go 2-D testing or 3-D testing?
 
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Can you give any examples of where these additional types of testing would be beneficial?
 
There was recent work on why bent spaghetti shatters rather than 'just' snaps.
https://phys.org/news/2018-08-mathematicians-age-old-spaghetti-mystery.html
IIRC, they found that applying torsion to um, pre-stress it made it snap clean when bent...

Per OP's query, I think the answer lies in the study of 'fatigue', where unfortunate shape concentrates flexure damage to initiate failure. Once that begins, a simpler model may approximate...
 
JBA said:
Can you give any examples of where these additional types of testing would be beneficial?
I am just asking why we are using theories of failure to determine 2-D faliure stresses why not practically test it as it is done with 1-D
 
Nik_2213 said:
There was recent work on why bent spaghetti shatters rather than 'just' snaps.
https://phys.org/news/2018-08-mathematicians-age-old-spaghetti-mystery.html
IIRC, they found that applying torsion to um, pre-stress it made it snap clean when bent...

Per OP's query, I think the answer lies in the study of 'fatigue', where unfortunate shape concentrates flexure damage to initiate failure. Once that begins, a simpler model may approximate...
I have a just simple question why theories of faliure was developed for 2-D and 3-D failure??
 

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