. Machine design. Fig. 7. 24 MACHINE DESIGN. Exercises. 1. Discuss the stresses and the arrangement of material inthe girder frame of a Corliss engine. 2. Ditto in the G frame of a band saw. Problem. Design a G frame similar to that shown in Fig. 7, for a shearpress capable of shearing a bar of mild steel 1| by 1£ inchesand having a gap four inches high and twenty-six inches deep. CHAPTER III. CYLINDER AND Fig. 8. ii. Thin Shells. Let Fig. 8 represent a section ofa thin shell, like a boilershell, exposed to an inter-nal pressure of p poundsper sq. inch. Then, if weconsider any diameter
. Machine design. Fig. 7. 24 MACHINE DESIGN. Exercises. 1. Discuss the stresses and the arrangement of material inthe girder frame of a Corliss engine. 2. Ditto in the G frame of a band saw. Problem. Design a G frame similar to that shown in Fig. 7, for a shearpress capable of shearing a bar of mild steel 1| by 1£ inchesand having a gap four inches high and twenty-six inches deep. CHAPTER III. CYLINDER AND Fig. 8. ii. Thin Shells. Let Fig. 8 represent a section ofa thin shell, like a boilershell, exposed to an inter-nal pressure of p poundsper sq. inch. Then, if weconsider any diameter AB,the total upward pressureon upper half of the shellwill balance the total down-ward pressure on the lowerhalf and tend to separatethe shell at A and B by-tension. Let d—diameter of shell in inches. r=radius of shell in of shell in of shell in tensile strength of material. Draw the radial line CP to represent the pressureon the element P of the surface. Area of element at P=lrdO. Total pressure on element —plrdO. Vertical pressure on element =plr sin BdO. Total vertical pressure on APB= f plr sin 0d0=2plr. 25 26 MACHINE DESIGN. The area to resist tension at A and B=2tl and itstotal strength =2tlS. Equating the pressure and the resistanceMS=2plr <-S -fi (18) The total pressure on the end of a closed cylindricalshell =7rr2p and the resistance of the circ
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