ABSTRACT

With an increase in loading rate, the nanohardness and Young’s modulus of the SLS glass sample increased respectively by ≈74% (Figure 11.1a) and ≈15% (Figure  11.1b), while the average projected area of contact (Ap) decreased in a corresponding manner (Figure 11.1a) [1, 2]. The load versus depth (P-h) plots for nanoindentations on the SLS glass sample at loading rates of 10, 100, 2,000, and 20,000 μN⋅s−1 are shown respectively in Figures 11.2a-d. From the data presented in Figure 11.2, it is observed that pronounced serrations appeared in the P-h plots, often more so at lower loading rates of 10 μN⋅s−1 (Figure  11.2a) than at higher loading rates of 20,000 μN⋅s−1 (Figure 11.2d).