| Abstract Scope |
The indentation test in glass is widely used not only for measuring hardness but also for evaluating susceptibility to crack initiation in glass. In fact, it has been well known that the crack initiation load (CIL) determined from the indentation test depends on glass compositions. Although CIL is one of the good measures to compare resistance to indentation-induced cracking among various glass compositions, one’s attention should be paid to the fact that CIL is the parameter obtained from the quasi-static indentation test. So far there’s been very limited information on the mechanical response, especially cracking behavior, of glass under the indenter at higher impact velocities. In this study, therefore, the dynamic indentation behavior of some silicate glasses is evaluated by using a lab-made drop indentation set-up. From in-situ observation images and the obtained load-depth curve during the test, the dynamic CIL and the dynamic indentation toughness are determined. |