2 lecture 4 - Failure Predictors and Safety Factors - slide

2 lecture 4 Failure Predictors and Safety Factors slide

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Unformatted text preview: anical Design Failure Predictors Maximum shear stress failure predictor Failure of a component will occur when the value of maximum shear stress, τMAX anywhere in the component reaches the value of Sys = Sy / 2 in a uniaxial test specimen. τMAX = (σ1 – σ3) / 2 = Sys = Sy / 2 where σ1 > σ2 > σ3 Sys = Yield Strength in Shear of the material (component and test specimen) Mechanical Design Failure Predictors Distortion energy failure predictor Failure of a component will occur when the value of distortion energy per unit volume, u(distortion) anywhere in the component reaches the value of u(distortion at yield) in a uniaxial test specimen. 2 2 Ⱥ 1 + µ Ⱥ σ1 − σ 2 + σ 2 − σ 3 + σ 3 − σ1 u (distortion) = 3E Ⱥ 2 Ⱥ ( )( )( ) 2 Ⱥ Ⱥ Ⱥ Ⱥ Uniaxial specimen: (σ1, σ2, σ3) = (σ1, 0, 0) = (Sy, 0, 0) … Mechanical Design Failure Predictors Distortion energy failure predictor Failure of a component will occur when the value of distortion energy per unit volume, u(distortion) anywhere in the component reaches the value of u(distortion at yield) in a uniaxial test specimen. 2...
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This note was uploaded on 04/09/2012 for the course MECHANICAL 101 taught by Professor Kent during the Three '11 term at University of Melbourne.

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