How to Calculate Von Mises Strain _ eHow
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How to Calculate Von Mises Strain
H oZ t o Calculat e V on M isesSt rain B Cassandra Tribe, eHow Contributor
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H ow t o Calculat et he V on M isesSt rain Assign the Principal Stresses to each of these designations: 1st Stress to {S1} 2nd Stress to {S2} 3rd Stress to {S3}
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T hing s Y ou' llN eed Principal stresses from a
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Yield (or failure) stress of the material Scientific calculator or
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If you do not have predetermined Principal Stresses for the material to be examined, you can calculate them from any point in the x, y or z direction from the principal axis. Principal Stresses work in combination from any point on the axis; the points you choose to calculate the Von Mises Strain for exist only within that area. Y ou can recalculate with any points from any area created through reassigning the Principal Stresses to determine the effect of the strain on the potential for failure. Using the following equation, substitute your Principal Stresses in the www.ehow.com/how_4740700_calculate-von-mises-strain.html
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appropriate location. (S1-S2)^2 + (S2-S3)^2 + (S3-S1)^2 = 2Se^2 For example, if your 1st stress was 4, the 2nd stress was 6 and your 3rd stress was equal to 8, the equation would then look like this: (4-6)^2 + (6-8)^2 + (8-4)^2 = 2Se^2 Note: (4-6)^2 is to be read as "four minus six to the second power" Sponsored Links
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www.ibt-usa.com Now, solve the equation to determine the value of {Se}. The value you discovered for {Se} is the Von Mises Stress or Strain; this is also known as the Equivalent Stress. The value of (Se), while the solution to the equation, is not the value that you are looking for to analyze the ductile failure of your material. There is one more step to perform to understand what the Von Mises Stress Value means to your material. Assign your known yield stress to the following designation, {Sy}. Now, solve the following equation: Sy -- Se If {Se} is larger then {Sy} (the result of the equation producing a negative number), then your material, at the point at which the Principal Stresses were calculated, is considered to be in total failure. Sponsored Links
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Always verify from several sources the validity of your Yield Stress numbers for your material.
This is a simplified version of the calculation; to calculate stress and strain for use in live environments, use forms of the calculation specific to the engineering standards for that environment.
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Y ou M a\ A lso L ike How to Calculate Strain Understanding strain in materials is simple: when you apply force to an object, the object deforms. In its most basic form, called...
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