Description
Thin films are encountered every day in technological devices and protective coatings. Confirming material properties before manufacturing these components will prevent failure, which is greatly important when society is attached to their technology that depend on on thin films. Nanoindentation is used to test film/substrate behavior, but there are some problems to overcome to extract properties correctly. For example, with a mismatch of elastic moduli and Poisson’s ratios of the film and substrate, the area calculations may be skewed by sink-in or pile-up of the material. Instead, we have a model that utilizes only material property constants that describes the composite elastic modulus behavior, regardless of problems related to pile-up or sink-in. However, no matter the film thickness, substrate material, or film material, pile up is found to be the same across samples at a specific indent depth. This is a very interesting phenomenon, and we are testing different material combinations to show that pile-up does not affect the extracted elastic properties of the film and substrate, such as elastic modulus.
Recommended Citation
Sullivan, M., & Prorok, B. (2014). Pile-up considerations during nanoindentation. In A. Bajaj, P. Zavattieri, M. Koslowski, & T. Siegmund (Eds.). Proceedings of the Society of Engineering Science 51st Annual Technical Meeting, October 1-3, 2014 , West Lafayette: Purdue University Libraries Scholarly Publishing Services, 2014. https://docs.lib.purdue.edu/ses2014/mss/mtfmm/24
Pile-up considerations during nanoindentation
Thin films are encountered every day in technological devices and protective coatings. Confirming material properties before manufacturing these components will prevent failure, which is greatly important when society is attached to their technology that depend on on thin films. Nanoindentation is used to test film/substrate behavior, but there are some problems to overcome to extract properties correctly. For example, with a mismatch of elastic moduli and Poisson’s ratios of the film and substrate, the area calculations may be skewed by sink-in or pile-up of the material. Instead, we have a model that utilizes only material property constants that describes the composite elastic modulus behavior, regardless of problems related to pile-up or sink-in. However, no matter the film thickness, substrate material, or film material, pile up is found to be the same across samples at a specific indent depth. This is a very interesting phenomenon, and we are testing different material combinations to show that pile-up does not affect the extracted elastic properties of the film and substrate, such as elastic modulus.