3 files changed, 150 insertions, 0 deletions
diff --git a/764/CH7/EX7.19.b/graph7_19.png b/764/CH7/EX7.19.b/graph7_19.png
new file mode 100755
index 000000000..e7b7f8c0b
--- /dev/null
+++ b/764/CH7/EX7.19.b/graph7_19.png
diff --git a/764/CH7/EX7.19.b/result7_19.txt b/764/CH7/EX7.19.b/result7_19.txt
new file mode 100755
index 000000000..d9a304656
--- /dev/null
+++ b/764/CH7/EX7.19.b/result7_19.txt
@@ -0,0 +1,91 @@
+-->//(Threaded Joints) Example 7.19
+ 
+-->//Maximum external force Pmax (kN)
+ 
+-->Pmax = 10
+ Pmax  =
+ 
+    10.  
+ 
+-->//Minimum external force Pmin (kN)
+ 
+-->Pmin = 0
+ Pmin  =
+ 
+    0.  
+ 
+-->//Assume the stiffness of the bolts to be 1N/mm kb
+ 
+-->kb = 1
+ kb  =
+ 
+    1.  
+ 
+-->//Calculate the stiffness of the parts kc
+ 
+-->kc = 3 * kb
+ kc  =
+ 
+    3.  
+ 
+-->//Overload percentage load (%)
+ 
+-->load = 50
+ load  =
+ 
+    50.  
+ 
+-->//Yield tensile strength of 50C4 Syt (N/mm2)
+ 
+-->Syt = 460
+ Syt  =
+ 
+    460.  
+ 
+-->//Ultimate tensile strength of 50C4 Sut (N/mm2)
+ 
+-->Sut = 660
+ Sut  =
+ 
+    660.  
+ 
+-->//Fatigue stress concentration factor Kf 
+ 
+-->Kf = 2.2
+ Kf  =
+ 
+    2.2  
+ 
+-->//Expected reliability (%)
+ 
+-->reliability = 90
+ reliability  =
+ 
+    90.  
+ 
+-->//Factor of safety fs
+ 
+-->fs = 2
+ fs  =
+ 
+    2.  
+ 
+-->//Assume diameter of the bolt to be less than 7.5mm for Kb to be 1
+ 
+-->d = 1
+ d  =
+ 
+    1.  
+ 
+-->//As Ka is incorporated into Kf, assume the assembly to be ground
+ 
+-->//This is just to obtain a random value of Ka
+ 
+-->op = 1
+ op  =
+ 
+    1.  
+ 
+
+Core cross-section area of the bolt(A) = 39.413787 mm2
+ 
+\ No newline at end of file
diff --git a/764/CH7/EX7.19.b/solution7_19.sce b/764/CH7/EX7.19.b/solution7_19.sce
new file mode 100755
index 000000000..bd4260cf2
--- /dev/null
+++ b/764/CH7/EX7.19.b/solution7_19.sce
@@ -0,0 +1,59 @@
+
+
+function[] = plot_format()
+    //Get the handle of current axes
+    g = gca()
+    //Give labels and set label properties
+    g.labels_font_color=5
+    g.font_size=3
+    g.grid=[1,1]
+    g.box="off"
+endfunction
+
+//Obtain path of solution file
+path = get_absolute_file_path('solution7_19.sce')
+//Obtain path of data file
+datapath = path + filesep() + 'data7_19.sci'
+//Obtain path of function file
+funcpath = path + filesep() + 'functions7_19.sci'
+//Clear all
+clc
+//Execute the data file
+exec(datapath)
+exec(funcpath,[-1])
+//Calculate the endurance limit stress for bolt Sdash (N/mm2)
+Sdash = (50/100)*Sut
+//Calculate Ka, Kb and Kc
+[Ka, Kb, Kc] = fluctuate(op, d, reliability)
+//Calculate Kd 
+Kd = 1/Kf
+//Calculate the corrected endurance limit stress Se (N/mm2)
+Se = Kb * Kc * Kd * Sdash
+//Plot modified Goodman diagram
+//The common quadrilateral in the plot is the area of concern
+y1 = {Se 0}
+x1 = {0 Sut}
+y2 = {Syt 0}
+x2 = {0 Syt}
+plot(x1,y1,'--*')
+plot(x2,y2,'-*')
+plot_format()
+title('Modified Goodman diagram (Example 7.19)')
+xlabel('sigmaM (N/mm2)')
+ylabel('sigmaA (N/mm2)')
+//Calculate the external force at overload condition PbMax (N)
+PbMax = (Pmax * 1000) + ((load/100)*Pmax * 1000)
+//Calculate the initial pre-load Pi (N)
+Pi = PbMax/((kb + kc)/kc)
+//Calculate the maximum force in the bolt PMAX (N)
+PMAX = Pi + ((kb/(kb + kc))*(Pmax * 1000))
+//Calculate the minimum force in the bolt PMIN (N)
+PMIN = Pi + ((kb/(kb + kc))*(Pmin * 1000))
+//Calculate the mean force and force amplitude
+Pm = (PMAX + PMIN)/2
+Pa = (PMAX - PMIN)/2
+//Calculate the actual core cross-section area of the bolt A (mm2)
+A = (Pa + (Pi/((1 + (Sut/Se)) * fs)))/(Sut/((1 + (Sut/Se))*fs))
+//Choose proper diameter from Table 7.1
+//Print results
+printf('\nCore cross-section area of the bolt(A) = %f mm2\n',A)