ME_423_lecture_6_Yield_and_Fracture

ME_423_lecture_6_Yield_and_Fracture - Brittle materials...

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1 http://www.youtube.com/user/e1m1s#p/u/72/p3bkZBJV7X8 Structure of Metals and alloys Yield and Fracture
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2 What happens at the yield point? Slip lines
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3 Single crystal Slip occurs when the shear stress on the slip plane in the slip direction reaches a critical resolved shear stress φ λ τ cos cos cos / cos A F A F R = =
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4
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5 Yielding start of plastic deformation Plastic deformation mechanisms of crystals slip twinning Plastic deformation requires sufficiently high shear stress!
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Unformatted text preview: Brittle materials versus ductile material Ductile materials With plastic deformation mechanisms Brittle materials Without plastic deformation mechanisms 6 Fracture Ductile fracture With plastic deformation Brittle fracture With little plastic deformation Failure Excessive deformation Yield Fracture 7 Failure theories...
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This document was uploaded on 10/28/2011 for the course MECHANICAL 423 at Michigan State University.

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ME_423_lecture_6_Yield_and_Fracture - Brittle materials...

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