11:48
Presentation given by Brayer Sousa from Worcester Polytechnic Institute at the USA eUser Meeting in September 2020.
33:06
Presentation by Prof. Danielle Cote from Worcester Polytechnic Institute at the USA eUser Meeting in September 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 microstructure, elasticity, and strength in 3D printed materials, leading to better printing and processing methods for safety and reliability. This session is a live demonstration of mapping the hardness and Y...
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.
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.
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 definition of hardness is not applicable.
Constant strain rate nanoindentation yields more meaningful data, albeit at the expense of the deformation velocity. Here, we show that the current strain rate limita...
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 nanoindentation. Mrs. Hay explains and demonstrates special considerations for shallow nanoindentation, with due consideration for the mechanics of plasticity. With this background, Mrs. Hay demonstrations h...
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 original paper. In this webinar, Dr. Oliver will provide an introduction to nanoindentation and how it is uniquely positioned to provide deeper insights in the analysis of the process/structure/property r...
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.
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.
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. (The dielectric constant, k, is a dimensionless expression of permittivity, having been normalized by vacuum permittivity.)
This session is a live demonstration of the nanoindentation technique for m...
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 silicon.
