
#1
May808, 03:34 PM

P: 4

Just a quick question:
Wikipedia tells me that due the shearing stress, the yeild strength of Stainless Steel is 520Mpa But how can i find out the Yeild strength of a 100mm long rod with diameter 10mm. Is the info for wikipedia based on a 1mx1mx1m cube? or some sort of SI unit. Cheers 



#2
May808, 04:23 PM

Sci Advisor
HW Helper
P: 8,961

The stress doesn't depend on the length of the rod  it only depend son the cross section area.
Mpa is mega pascal  is a unit of pressure, 1 pa is one Newton/m^2 So 1Mpa is around 100,000 Kg/m^2, or 145psi 



#3
May808, 04:32 PM

P: 4

i see, but the what cross section area are the stresses relating to? and does it also depend on the shape?
If i see the value of 520MPA in a book for s steel, how can i use that to aplly it to a rod with a given diameter? 



#4
May908, 08:02 AM

Sci Advisor
P: 5,468

Shear Stress of a particular length rod
Calculating the deformation of a rod requires three things the applied stress, the mechanical properties of the rod, and the geometry of the rod. All you have right now is (I'm guessing) the Young's modulus for a particular type of stainless steel and the geometry of the rod.
Try surfing through these, see if it helps: http://www.clag.org.uk/beammenu.html http://www.mhhe.com/engcs/engmech/be...ctureppt.mhtml http://www.grantadesign.com/resource...ns/elastic.htm Note thin beams have a simple approximate solution. Yours, with an aspect ratio of 10, may or may not be amenable to that approximation. 


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