initial commit / add all books

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diff --git a/3257/CH8/EX8.2/Ex8_2.sce b/3257/CH8/EX8.2/Ex8_2.sce
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+// Comparison of forming and machining energy

+clc

+d_i = 10 // diameter in mm

+l = 125 // length in mm

+del_d = 0.5 // reduction in diameter in mm

+K = 1275 // constant in MPa

+n = 0.45 // constant

+Es = 4.1 // Specific energy in machining in W-S/mm^3

+printf("\n Example 8.2")

+printf("\n\n Part A:")

+d_o = d_i - del_d

+epsilon = log((d_i/d_o)^2)

+u = K*1e6*epsilon^(n+1)/(1+n)

+W_tension = u*%pi*l*1e-3*(del_d*1e-2)^2

+

+printf("\n Work done by pulling in tension is %d Nm.",W_tension)

+printf("\n\n Part B:")

+V = %pi/4*(d_i^2-d_o^2)*l

+W_mach = Es*V

+ratio = W_mach/W_tension

+printf("\n Work done by machining on lathe is %d Nm.",W_mach)

+printf("\n Work done on machining is about %d time higher than that of tension.",ratio)

+

diff --git a/3257/CH8/EX8.2/Ex8_2.txt b/3257/CH8/EX8.2/Ex8_2.txt
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+ 

+ Example 8.2

+

+ Part A:

+ Work done by pulling in tension is 317 Nm.

+

+ Part B:

+ Work done by machining on lathe is 3924 Nm.

+ Work done on machining is about 12 time higher than that of tension.
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