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Shear vs torsion - difference?

Shear vs torsion - difference?

Shear vs torsion - difference?

(OP)
Hi folks,
Is there a way, via SEM, to tell the difference between a shear failure vs a torsion failure or, are the fractures basically the same? An elongated dimple rupture?

RE: Shear vs torsion - difference?

Your question is vague, given that a ductile torsion failure IS a shear failure.

RE: Shear vs torsion - difference?

IsTHATbainite;
Have you examined the macrofeatures of the fracture surface to establish service loading conditions? Normally, one begins with observations related to the entire fracture surface before drilling down to higher magnification.
Yes, elongated dimples from ductile rupture can be under shear load or torsional load conditions.
 

RE: Shear vs torsion - difference?

If I understand your question, you want to tell from a fracture surface if the part fractured due to uniform shear or from torsion.  If so, then the idea would be to look at various positions on the fracture surface.  Torsion would produce elongated dimples that change orientation as you change position.  Uniform shear should product dimples with the sample orientation over the entire surface.

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