For diamond contact, the diamond tip has an elastic modulus of 1141 GPa, and Poisson's ratio of 0.07. The tip-LLZO contact was simplified as an axisymmetric model, and both the tip and LLZO were modelled using 8-node quadrilateral elements (CAX8R) with a fine mesh of nm at the contact to ensure convergence. The color contour reveals the Von Mises stress.