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Helical Torsional Stress (cold-drawn carbon steel)

Last modified by
on
Jul 24, 2020, 6:28:07 PM
Created by
on
Dec 12, 2014, 7:49:06 AM
Sy=0.78⋅Sut[Wire Type,d]
Wire Diameter
Wire Type
Tags
Mechanical Engineering
UUID
59751282-81d3-11e4-a9fb-bc764e2038f2

This equation computes the helical torsional stress. 

The tensile strength of spring steel may be found as:

Sut=Adm, where A and m are uniquely defined for American National Standards Institute (ASTM) materials:

  • A227 - Hard Drawn Wire
  • A228 - Music Wire
  • A229 - Oil Tempered Wire

The allowable stress σ then for a spring of cold-drawn carbon steel then given by this equation as:
 Sy=σ=0.78Sut
  

Description

Tensile Strength Parameters A & mMaterial ASTM m A
Music wire A228 0.163 2060
Oil-tempered wire A229 0.193 1610
Hard-drawn wire A227 0.201 1510
Chrome vanadium A232 0.155 1790
Chrome silicon A401 0.091 1960














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