Nanoindentation Educational e-Seminar | January 25
Theory and Practice of Instrumented Indentation
A new e-seminar series from Nanomechanics
Session 7: The Onset of Plasticity in Nanoindentation
Wednesday, January 25, 2017
12:00pm, Eastern Time
Design and analysis of instrumented indentation experiments require knowing 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. For Hertzian indentation, the onset of plasticity depends on applied load, indenter geometry, and material properties. Because conical indentation is self-similar, the onset of plasticity depends only on indenter geometry and material properties, not applied load.
Who Should Attend and Why?
Anyone responsible for or interested in nanoindentation should attend to quickly gain a comprehensive understanding of the test method and what it can do. Process engineers, test engineers and graduate students will achieve theoretical and practical knowledge about contact mechanics, the Oliver-Pharr method, dynamic indentation, thin-film modeling, and best practice.
About the series
Instrumented indentation, also called nanoindentation, has developed over the last three decades as the technique of choice for measuring the mechanical properties of thin films and other small volumes of material. This instructional e-seminar, held monthly, covers all aspects of instrumented indentation, from overarching concepts to practical aspects of implementation.
The first session explains why materials behave differently at the nanoscale, and provides an elementary introduction to instrumented indentation and its benefits. Subsequent sessions teach contact mechanics, the Oliver – Pharr method, dynamic indentation, and thin-film modeling. Theory is applied to a variety of common applications for instrumented indentation, including low-k films, hard coatings, polymers, and small structures. Attendees are invited to suggest topics for future sessions.
About the instructor
Jennifer Hay is a senior applications engineer with Nanomechanics, Inc., a company which designs and produces advanced nano-scale metrology products, including turnkey nanoindenters, modular devices for actuation and sensing, and contract testing. Mrs. Hay holds a masters’ degree in Mechanical Engineering from the University of Houston and has worked in the field of nano-indentation since 1996, advancing standardization while also developing methodology for new applications including thin films, anelastic metals, polymers, gels, and biomaterials. Mrs. Hay presently serves as the vice-chair for the MEMS/Nanomechanics technical division of the Society of Experimental Mechanics. In addition to many journal articles and conference papers, she has authored five invited journal articles on the theory and practice of instrumented indentation.