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P
n  , (4.16)
 
d 
cr
where  – the thickness of the sheet.
In calculating the rivet we take
    0,6 0,8    ;
cut t
   1,7 2    ,

cut t

where   – allowable stress in tensile.
t

Figure 4.7

Cut and crushing are calculated for groove, pin, key, spline,
profile and other connections.
The basic calculation for prismatic keys is conditional
calculation on crushing. It is believed that the pressure on the
contact surface of the side faces of key with the shaft and hub
evenly distributed (Fig. 4.7).
The strength condition on crushing is most often used to find
allowable moment on the shaft

  0,5M  dlk  (4.17)
  ,
cr
where l – the working length of the key,
k  0,4h – the depth of key cutting in the hub.
For simpler calculation it is believed that the arm of forces
acting on the key, is 0,5d .

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