SBR/steel interface shear strength CTE SBR 3.4 MPa 10 MPa 0.49 2 MPa 220 × 10-6°C-! DOC

A disk of SBR elastomer 3.0 cm in diameter 0.5 cm
thick is used as a cushioning surface between two steel rods of
the same diameter, as shown below (not to scale). a. If the rods are brought together with an axial force
of 100 N such that the SBR is compressed
elastically between them, what is the thickness
of the SBR under load?
b. Under the same conditions as part (a), what is the
greatest possible diameter of the SBR under load?
c. If the SBR is bonded to the rods, how far can one
rod be rotated with respect to the other before the
SBR/rod interface fractures? Assume that the
rods are essentially rigid and the distance
between them remains constant. Please answer
in degrees of rotation.