自动门
自动门:中心轴K-K截面强度校棱
发布时间:2013/2/4

成都自动门讯:

中心轴K-K截面强度校棱

    危险截面K-K截面疲劳安全系数的校核计算式为
    :—S" S.r≥[S.]
    俨一亏r
    枢野
式中  n-安全系数;
  S,a -只考虑弯曲时的安全系数;
  S,.——只考虑扭转时的安全系数;
[S.]——按静强度的许用安全系数,
(4.23)
式中  crI一一屈服极限.MPa;中心轴的口,-360MPa;
    MmI——危险截面(K-K截面)最大弯矩,N*m,中心轴的Mmu =MF;
    W -K—K截面的抗弯截面系数.m3 0
    K-K为圆截面,其W值为
    w’=考芋  (m3)    (4.25)
式中  d-中心轴直径,m。
    S..=TL    (4.26)
    Tmx
    WT
    W    一兀d3
    Ⅳr=2W=    ( II13)    ‘(4.27)
    16
式中  r -扭转屈服极限,MPa,中心轴的rJ=211MPa;
    T    mx-K-K截面的最大扭矩,N-m,中心轴的最大扭矩丁眦x=M.J
    WT-抗扭截面系数,lI13。
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