7-1-2、斜截面上的应力 Fp -po 0,=pg·C0s0=ox·cos20 To=Po'sin 0=1 0x·sin20 7-1-2、斜截面上的应力 σ θ θ A F A F p x Nx θ Nx cos cos = = =   p θ σ θ p θ σ θ θ x θ x sin 2 2 1 sin cos cos2 =  =  =  =     