2017FA_ME_3222_FR01A-FR02A-05Oct2017.pptx

2017FA_ME_3222_FR01A-FR02A-05Oct2017.pptx - MANUFACTURIN G...

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MANUFACTURIN G ENGINEERING-I October 5, 2017 | Gobinda Saha, Ph.D., P.Eng.
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Bauschinger Effect 2 When a metal with a tensile yield stress, , is subjected to tension into the plastic range and then the load is released and applied in compression, the . This phenomenon is known as the Bauschinger Effect Also known as ‘ strain softening ’, because the in reverse direction is lowered by the plastic strain Exhibited in varying effects by all metals/alloys Example: Bending/unbending, Reverse drawing
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Residual Stresses 3 Stresses remain within the part after deformation and all external forces removed. Primary causes: Phase transformation-volume changes due to density change Temperature gradient, non-uniform plastic deformation Bending beam-elastic recovery Effects: Tensile residual stress -> lowers fracture strength, fatigue life, initiates stress corrosion cracking
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