420_Topic1_Ch5_failure_static

420_Topic1_Ch5_failure_static - MECH 420 Failure from...

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Unformatted text preview: MECH 420 Failure from static loading Slide 1 Chapter 5 Failure from Static loading MECH 420 Failure from static loading Slide 2 Static Strength • Ideally, before designing a part, many strength tests should be performed on test specimens of the same material as the design part & under the same loading conditions that the part might endure. • This process is costly and most of the time is not justified. • Engineer can only use published data ( i.e., MECH 420 Failure from static loading Slide 2 Static Strength • Ideally, before designing a part, many strength tests should be performed on test specimens of the same material as the design part & under the same loading conditions that the part might endure. • This process is costly and most of the time is not justified. • Engineer can only use published data ( i.e., yield strength, ultimate strength,…) MECH 420 Failure from static loading Slide 3 Failure Theories • NO UNIVERSAL theory of failure for the general case of material properties and stress state. • Several hypotheses have been formulated and tested over the years. MECH 420 Failure from static loading Slide 4 • Ductile – ε f ≥ 0.05 – S yt =S yc =S y Ductile & Brittle materials • Brittle –...
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This note was uploaded on 02/07/2011 for the course MECH 420 taught by Professor M.s during the Fall '09 term at American University of Beirut.

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420_Topic1_Ch5_failure_static - MECH 420 Failure from...

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