强度比X
性能等级8.89.810.912.9比值X0.840.8150.790.75 xσbminτBmin
0.751200900
d(公称直径)P(螺距)dlmin(小径)
24318.5925
dlmin W Pmin
18.59251261.313476
τBmin Wpmin M Bmin
9001261.3134761135.182129