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MS115a Lect 16 10 26 2011

MS115a Lect 16 10 26 2011 - Mechanical Properties Review...

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Mechanical Properties: Review l 0 A 0 F 0 F A σ= 0 0 l l l ε - = σ (stress) ε (strain) Y nominal (engineering) 0 0 ln l total l dl dl l d l l l = = = ÷ true i F A plastic – rearrange chemical bonds elastic – stretch chemical bonds stress strain σ y
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Shear stress from uniaxial tension A F F A σ= force is normal to the plane normal stress A ˆ n consider what happens on some other plane, A’ φ need to know area of A′ A′ = A/cos( ) consider shear force parallel to A′
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MS115a Lect 16 10 26 2011 - Mechanical Properties Review...

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