A work part with starting height h 100 mm and diameter 55

A work part with starting height h = 100 mm and diameter = 55 mm is compressed to a final height of 50 mm. During the deformation, the relative speed of the platens compressing the part = 200 mm/s. Determine the strain rate at (a) h = 100 mm, (b) h = 75 mm, and (c) h = 51 mm.

Solution

Determine the strain rates -

(a) When h = 100 mm;
   Strain rate = [(200 mm/s)/(100 mm)]
   = 2 s^-1

(b) When h = 75 mm;
   Strain rate = [(200 mm/s)/(75 mm)]
   = 2.667 s^-1

(c) When h = 51 mm;
   Strain rate = [(200 mm/s)/(51 mm)]
   = 3.922 s^-1