What is the smallest indent you can make?

Nanomechanics Inc., Staff
January 11, 2017

This is perhaps the most common question in nanoindentation!  The answer to this question depends on The Onset of Plasticity, which is the topic of Nanomechanics’ next webinar to be held on Wednesday, January 25th at 12pm EST.  To attend the live event, register here.  To put it “bluntly”: You can’t make a good hardness measurement if the indent doesn’t actually cause plasticity!

January Nanomechanics Webinar

About the webinar series, The Theory and Practice of Instrumented Indentation:

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 webinar series, held monthly, covers all aspects of instrumented indentation, from overarching concepts to practical aspects of implementation.   Click here to view the first recorded webinar in this series.

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 presenter:

Jennifer Hay is a senior applications engineer with Nanomechanics, Inc., a company which designs and produces advanced nano-scale metrology products, including turnkey nano-indenters, modular devices for nano-scale 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

Session 7: The Onset of Plasticity (Abstract)

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. To register for this next webinar on Wednesday, January 25th, click here.