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8/19/2019 Plane Stress Euy
http://slidepdf.com/reader/full/plane-stress-euy 1/1
τxy = 8 x 106 ( 0 – 0,00375 – 0,00075 + 0,001875 + 0 + 0 )
= - 21000 psi
σ1 = ( σx + σy ) / 2 + [ ( ( σx – σy ) / 2 )2 + τ2xy ]0,5 = σmax
σ2 = ( σx + σy ) / 2 - [ ( ( σx – σy ) / 2 )2 + τ2xy ]0,5 = σmin
tan 2θ p = 2τxy / ( σx – σy ) θ p = 0,5 tan -1 [ 2τxy / ( σx – σy ) ]
σ1 = ( - 10000 - !0000 ) / 2 + [ ( (- 10000 + !0000 ) / 2 )2 + (- 21000)2 ]0,5
= - 25000 + [ ( 15000 )2 + (- 21000)2 ]0,5
= - 25000 + 25807
= 807 psi
σ2 = ( - 10000 - !0000 ) / 2 - [ ( (- 10000 + !0000 ) / 2 )2
+ (- 21000)2
]0,5
= - 25000 - [ ( 15000 )2 + (- 21000)2 ]0,5
= - 25000 - 25807
= - 50807 psi
θ p = 0,5 tan -1 [ 2 ( - 21000 ) / ( - 10000 – ( - !0000 ) ]
= 0,5 tan -1 [ - !2000 / 30000 ]
= 0,5 tan -1 [ - 1,! ]
= - 27,2 "