. Railway mechanical engineer . Fig. 35—Inside Crosshead of the Great Western Engine Fig. 33 shows the piston. This is of the usual box type and intensity of the stresses increases directly as their distance fromis made of cast iron. Figs. 34 and 35 show the crossheads for the neutral axis, the minimum stress being at the outer fibers;both the outside and the inside cylinders of the Great Western this is shown at the right in Fig. Four-Cylinder Simple Pacific Type Locomotive engine. The stresses at the dilYerent sections inheads are shown in table XIII. ese cross- Table XHI—Stresse-s in P
. Railway mechanical engineer . Fig. 35—Inside Crosshead of the Great Western Engine Fig. 33 shows the piston. This is of the usual box type and intensity of the stresses increases directly as their distance fromis made of cast iron. Figs. 34 and 35 show the crossheads for the neutral axis, the minimum stress being at the outer fibers;both the outside and the inside cylinders of the Great Western this is shown at the right in Fig. Four-Cylinder Simple Pacific Type Locomotive engine. The stresses at the dilYerent sections inheads are shown in table XIII. ese cross- Table XHI—Stresse-s in Piston Rod and Crosshead of Great WesternPacific Type LocnMOTiVE .Section, and kind of stress Shear on Tension in rod through keyway Tension in neck of crosshead through Crushing of key on the rod Crushing of key on the crosshead Bearing pressure, pin on crosshead 3,680 main shank of rod Amount of str11). per sq. ,8508,0004,20021,00037,000 In addition to the bending stresses which act normal to asection, the beam is subjected to shearing stresses. At anysection of the beam, the shear is equal to the sum of the verticalcomponents of the external forces or loads on one side of thatsection. It is quite generally assumed that the shearing stressesare uniformly distributed over the cross section of the beam; inreality, the unit shearing stress at the neutral axis of a rectangu-lar section is 50 per cent,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
