11:48
Presentation given by Brayer Sousa from Worcester Polytechnic Institute at the USA eUser Meeting in September 2020.
Posted Thursday, October 29, 2020
33:06
Presentation by Prof. Danielle Cote from Worcester Polytechnic Institute at the USA eUser Meeting in September 2020.
Posted Thursday, October 29, 2020
58:29
3D printing is the disruptive manufacturing method of the 21st century. In many ways, it is inferior to traditional methods of casting and machining, because microstructure and defects are not well understood or controlled. Yet, the technique is irresistible due to its speed, simplicity, and portability. High-speed nanoindentation is a critical tool for understanding the link between microstruc...
Posted Wednesday, October 14, 2020
01:00:15
With careful attention to instrumentation and software, nanoindentation experiments can be accomplished at a rate faster than one second per indent. High-speed indentation opens new doors for statistical analysis and mechanical-properties mapping.
Posted Wednesday, October 14, 2020
51:18
Mr. Crawford (former manager of the materials-testing laboratory at Johns Hopkins University) shows how to prepare a porous metal for high-speed nanoindentation. He provides recommendations for equipment and demonstrates all aspects of metallographic mounting and polishing.
Posted Friday, September 25, 2020
23:29
Nanoindentation is typically performed at slow strain rates < ~0.1/s, which precludes it from ballistic applications. Recent years have seen the development of nano-impact testing, which produces much higher deformation rates. However, data from such experiments are challenging to interpret, because the high strain rates are not sustained throughout the experiment and the classical definitio...
Posted Wednesday, June 17, 2020
01:02:45
The first and most enduring application of nanoindentation is the characterization of hard coatings designed for mechanical and chemical protection of an underlying material. Diamond-like carbon is a common coating of this kind, with typical coating thickness being less than 100nm. This session is a live demonstration of nanoindentation with the KLA iNano, optimized for very shallow nanoinden...
Posted Wednesday, May 13, 2020
01:14:40
Dr. W.C. Oliver and Dr. G.M. Pharr's 1992 publication titled ‘An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments’ is the most cited paper in materials science with over 22,000 citations to date. This webinar provides an opportunity to learn about nanoindentation directly from Dr. Warren Oliver, the co-author of the orig...
Posted Tuesday, April 14, 2020
26:54
Application and service engineers have leveraged remote operation of the KLA nanoindenters for years. Join us as we share best known methods for remote operation of the instruments and answer your questions.
Posted Friday, April 10, 2020
01:08:06
Valid hardness measurements require actually causing plasticity. Thus, we must know the threshold and locus for the onset of plasticity. In this session, we use the Tresca criterion to understand the onset of plasticity for both Hertzian and conical indentation. These criteria guide our understanding of the minimum depth at which one can measure a meaningful hardness.
Posted Thursday, April 9, 2020
01:00:57
In digital circuits, materials with low permittivity separate the conducting parts from one another; materials with lower permittivity provide better electrical and magnetic insulation. Continuous reduction in scale drives the optimization problem of lowering the permittivity of the insulator as much as possible, without compromising mechanical integrity, as quantified by the Young’s modulus. ...
Posted Wednesday, March 11, 2020
01:06:01
Substrate influence is a common problem when using nanoindentation to evaluate the elastic modulus of thin films. In this session, an elastic model for film-substrate interaction is presented which returns accurate film moduli even when substrate influence is substantial. The new model is applied to the interpretation of nanoindentation data on various thin films, including low-k films on sil...
Posted Wednesday, February 12, 2020
