23:01
仪器化纳米压入测试方法,应用及其标准化。演讲嘉宾：中国科学院力学研究所冯义辉教授
Posted Thursday, September 16, 2021
01:01:57
Two nanoindentation calibrations are accomplished by means of indentation experiments on a reference material. These are the load-frame stiffness calibration, which quantifies the expected flexure in the test equipment, and the area-function calibration, which quantifies the precise shape of the indenter. This presentation explains how these calibrations affect nanoindentation analysis, and how...
Posted Tuesday, January 7, 2020
56:49
Knowledge of Young’s modulus is essential for the design and control of the extensive fractures required for harvesting natural gas from shale formations. Nanoindentation of drill fragments provides an economical and localized way to measure Young’s modulus of shale. This session is a live demonstration of standardized nanoindentation with the KLA iMicro nanoindenter to characterize shale. Ms. ...
Posted Wednesday, September 11, 2019
53:38
Low-carbon steels are the first option when designing with steel. They offer good machinability and excellent weldability. To some extent, the strength and ductility can be manipulated by various thermal and mechanical processes, such as working, annealing, and carburization. This session is a live demonstration of standardized nanoindentation with the KLA iMicro nanoindenter to characterize co...
Posted Wednesday, July 10, 2019
01:01:00
In its most basic form, instrumented indentation involves pressing an indenter of known geometry into a test surface while continuously monitoring force and displacement. In this session, we review the test and analysis commonly known as the “Oliver-Pharr” method for measuring hardness and Young’s modulus. The continuous measurement of force and displacement affords two important advantages ove...
Posted Wednesday, June 12, 2019
57:39
The first and most enduring application of nanoindentation is the characterization of hard coatings designed for mechanical and chemical protection of an underlying material. This session is a live demonstration of standardized nanoindentation with the KLA iMicro nanoindenter to characterize an industrial nitride coating on a tungsten- carbide substrate. Ms. Hay demonstrates sample mounting, in...
Posted Tuesday, May 14, 2019
53:30
In 1992, Warren Oliver and George Pharr published an article that revolutionized hardness testing. The genius of Oliver and Pharr was that they devised a way to know the size of a hardness indentation without imaging it. This development disrupted Vickers and Knoop microhardness testing, which required direct measurement of the lengths of the indentation diagonals. Not having to image the inden...
Posted Wednesday, April 10, 2019
