  Stress-strain plots based on nanoindentation load-depth curves reflected
cracking phenomenon. A transition from ductile to brittle fracture was observed
on increasing the depth or load of indenter penetration. A new approach with
shape factors in the fracture studies based on radial crack branching and
micro-cracking was done. Hardness and modulus plots were fitted with
polynomials. The coefficients were varied to obtain different hardness and
modulus responses.
