initial commit / add all books

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diff --git a/278/CH12/EX12.1/ex_12_1.sce b/278/CH12/EX12.1/ex_12_1.sce
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+//desing cotter joint

+clc

+//solution

+//given

+P=30*10^3//N

+ft=50//N/mm^2

+t=35//N/mm^2

+fc=90//N/mm^2//crushing stress

+//let d be diameter of rods

+pi=3.14

+//P=A*ft

+//P=(p1/4)*d^2*ft

+d=sqrt((P*4)/(pi*ft))

+printf("the dia nof cotter jont is,%f mm\n",d)

+//let d2 be dia of spigot and t11 be thickness

+//t11=d2/4

+//P=[{(pi/4)*d2^2}-(d2*t)]*ft=26.8*d2^2

+d2=sqrt(P/26.8)//mm

+t11=d2/4//mm

+//let fc1 be induced crushing stress

+fc1=P/(d2*t11)//N/mm^2

+printf("the induced crushing stress is,%f N/mm^2\n ",fc1)

+printf("since induced stress is greater then 90 N/mm^2,therefore d2 an t are not safe limits,let us find d2 and t by substituitn fc1=90\n")

+//let d2=d21 and t=t1

+//P=d21*t1*fc

+//P=22.5*d2^2

+d21=sqrt(P/22.5)//mm

+t1=d21/4//mm

+printf("the safe values od d2 and t are ,%f mm\n,%f mm\n",d21,t1)

+//let b be width of cotter

+//P=2*b*t1*t=(2*9.12*35)*b

+b=P/(2*9.12*35)//mm

+printf("the width of cotter is,%f mm\n ",b)

+//let d4 be dia of socket collar

+//P=(d4-d2)*t1*fc

+d4=d21+(P/(t1*fc))//mm

+printf("the diametr of socket collar is,%f mm\n",d4)

+//let c be the thickness of socket collar

+//P=2*(d4-d2)*c*t

+c=P/(2*(d4-d21)*t)//mm

+printf("the thicknes of socket collar is,%f mm\n",c)

+//let a be distance from end of slot to end of the rod

+//P=2*a*d21*t

+a=P/(2*d21*t)//mm

+printf("distance from end of slot to end of the rod is,%f mm\n",a)

+

+//let d3 be dia of spigot collar

+//P=(pi/4)*[d3^2-d21^2]*fc

+//d3^2=d21^2 + (P*4)/(90*pi)

+d3=sqrt(d21^2 + (P*4)/(90*pi))//mm

+printf("dia of spigot collar is,%f mm\n",d3)

+//let T1 be thickness of spigot collar

+//P=pi*d21*T1*t

+T1=P/(pi*d21*t)//

+printf("thickness of spigot collar is,%f mm\n",T1)

+printf("let thickness of spigot collar be T1=8mm=T12")

+//let l be lengt of cotter

+T12=8//mm

+printf("the thicness of spigot colar is,%f mm\n",T12)

+l=4*d//mm

+e=1.2*d//mm

+printf("the length of cotter and e is,%f mm\n,%f mm\n",l,e)
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