d尺寸系数:图12.25pagc232 Yx=1.0 e安全系数:表12.14page225 SEmin=1. 25 许用应力:[ oF1=OFliml YNIYx/sm091231m4m 2=onm2Yx2Yx/Smm=450×0.97×1.0/1,25[o=349MPa 4)校核 2K71 oFI bd,mn YFalrsalrere 01838253×162×065g9 2×4.28×191000 oFI=203Mpa 203×222×178/2.55×162 oF2=194 Mpa 安全d.尺寸系数：图12.25page232 YX=1.0 e.安全系数：表12.14page225 SFmin=1.25 f.许用应力：[F1]=Flim1YN1YX/SFmin=600×0.95×1.0/1.25 [F1]=456Mpa [F2]=Flim2YN2YX/SFmin=450×0.97×1.0/1.25 [F1]=349MPa 4)校核 F1=203Mpa <[F1] F2= F1YFa2YSa2/YFa1YSa1 =203×2.22×1.78/2.55×1.62 F2=194Mpa <[F2] 安全 2.55 1.62 0.69 1.39 83 83 2.5 2 4.28 191000 2 1 1 1 1 1         =  = Y Y YY b d m KT Fa sa n F