During open die forging process using two flat and parallel dies, a solid steel disc of initial radius (RIN) 200 mm and initial height (HIN) 50 mm attains a height (HFN) of 30 mm and radius of RFN, Along the die-disc interfaces, (i) The coefficient of friction ( ) is: = 0.35 [1 + e RIN/RFN] (ii) In the region Rss r RFN sllding friction prevails and P = 3 K.e2 (RIN r)/HFN and = p, sllding friction prevails and Where p and are the normal and the shear stresses respectively; K is the shear yield strength of steel and r is the radial distance of any point. (i) In the region 0 r RIN, sticking condition prevails. The value of Rss (in mm), where sticking condition changes to sliding friction is

During open die forging process using two flat and parallel dies, a so

1.	During open die forging process using two flat and parallel dies, a solid steel disc of initial radius (RIN) 200 mm and initial height (HIN) 50 mm attains a height (HFN) of 30 mm and radius of RFN, Along the die-disc interfaces, (i) The coefficient of friction ( ) is: = 0.35 [1 + e RIN/RFN] (ii) In the region Rss r RFN sllding friction prevails and P = 3 K.e2 (RIN r)/HFN and = p, sllding friction prevails and Where p and are the normal and the shear stresses respectively; K is the shear yield strength of steel and r is the radial distance of any point. (i) In the region 0 r RIN, sticking condition prevails. The value of Rss (in mm), where sticking condition changes to sliding friction is
A.	241.76
B.	254.55
C.	265.45
D.	278.20
Answer» C. 265.45

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