'A bar ABC of length L consists of two parts of equal lengths but different diameters. Segment AB has diameter d1= 100 mm while segment BC has diameter d2 60 mm: Both segments have length L/2 = 0.6 m. A longitudinal hole of diameter d is drilled through segment AB for one-half of its length (distance L/4= 0.3 m) The bar is made of plastic having modulus of elasticity E 4.0 GPa: Compressive loads P= 110 kN act at the ends of the bar: If the shortening of the bar is limited to 8.0 mm; what is the maximum allowable diameter dmax (mm) of the hole?
dmax'