Читать книгу Manual of Laboratory Testing Methods for Dental Restorative Materials - Paromita Mazumdar - Страница 24

With nanoscience gaining popularity, nanoindenters have advantages over traditional mechanical testing by providing both elastic modulus and hardness data of the tested samples. Nanoindentation is conducted with a calibrated Berkovich diamond indenter tip. A Berkovich tip is a three‐sided pyramidal indenter.

During the nanoindentation process, a calibrated indenter tip approaches the surface of the sample. The force–displacement data is used to determine the point of contact. After the sample is contacted, the force is linearly increased and the tip indents into the surface of the sample. A short dwell time occurs at the maximum force and then the sample is unloaded. At the initial point of unloading, the stiffness is measured.