Shear strength and 304 stainless steel
Shear strength and 304 stainless steel
(OP)
Does anyone know the relationship between shear strength and yield strength of 304 stainless steel or any type of stainless steel for that matter. My Machinists handbook does not list that value for stainless steel. I found on some other old forums on the internet that .577 x yield or .6 x yield as a rule of thumb works for shear, but I don't know the source of that info or how it is derived. I look forward to your replies.





RE: Shear strength and 304 stainless steel
A popular on (I believe used by the ASME Code) is Tresca or maximum shear stress theory of failure. It assumes that the material is highly ductile, which 304 is. In such materials, the failure stress in pure shear is half the tensile stress failure. I don't think those theories deal with yield failures, so I'm unclear if the same ratios apply.
Other theories include maximum principal stress failure (usually brittle materials) and Von Mises (constant energy of distortion failure theory, I think).
The failure envelopes, though don't follow precise patterns. There is statistical scatter.
I think the reason you're finding scatter is that materials don't behave ideally, don't fail at one discrete stress, and may not be anisotropic (meaning their properties aren't alwasy the same in all three coordinate directions).
RE: Shear strength and 304 stainless steel
shear stress to cause yield = tensile yield/√3
RE: Shear strength and 304 stainless steel