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What is the permissible stress of any material?
What is the permissible stress? What is the relation between tensile or yield strength and permissible stress? I actually want to know the permissible stress of Steel Grade CF8 / CF8M.
Tensile strength is the common strength listed for materials. It is the strength in elongation or compression as compared to the strength in shear. Some materials like concrete are strong in compression, but weak in tension. For steels there is no distinction. ( Brittle materials like concrete have other considerations.) The typical stress / strain test curve for the individual steels show tensile strength (stress in psi) compared to elongation (strain in inches per inch of length). It shows the yield strength - also called the elastic limit and the ultimate strength where it finally breaks. Tensile stresses above the yield strength will permanently deform the steel. The tensile yield strength should be the basis of most structural considerations.
Grade CF8 and CF8M appear to be 304 and 316 series stainless steels. These have yield strengths of about 30,000 -35000 psi which is also typical for most common grades of the plain carbon steels.
Designs should consider loads which do not exceed the yield strength of the steel. Steel construction safety factors will vary depending of the type of device or structure be it a machine part or a highway bridge.They can vary from 1.25 to 4, from ordinary to critical, from sure to uncertain.
A safety factor of 2 would reduce the allowable or permissible design yield strength of this steel to 15,000 -17,500 psi.
Steel Rebar Tensile Test
 Industrial Grade 4LVP3 Barbed Wire, 2 Barbs, Hi-Tensile Sale Price: $171.24  Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product DescriptionBarbed Wire, Coil, Steel, Galvanized, 15.5 Gauge, Mesh Size 2 Barbs Every 5 In, Length 1320 Ft.  |
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