00:01
All right, so here in part a, let in part a, we want to compute the ductility of abras that has a yield strength of 345 megapascals.
00:16
So in order to solve this problem, it is necessary to consult bigger from the book, which is 7 .19a and also c, right? so from bigger, this 7 .19a, a yield strength up, a yield strength of 345 megapascal per brass corresponds to 20 % clockwise, right? so a brass that has been cold worked with a 20 % will have a ductility up above 24%.
00:58
Percent elongation right 24 percent elongation right so this is the ductility right and let in part b in part b we are asked do to let the let this portion of the problem as para brainal hardness up brain hardness up 1040 steel right so it having a yield strength of 620 megapascals, right? and from that figure, which is 7 .19a, a yield strength of this per steel up 10 port steel corresponds to about 5 % up clockwise, right? so a 10 -port steel that has been code worked with a 5 % will have it in cell strength up about 750 megapascals.
02:08
So finally we will using the brinnell hardness equation...