Experimental methods for tensile testing of metallic thin films at high temperatures

N. J. Karanjgaokar, C. S. Oh, I. Chasiotis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Two methods for microscale tension experiments with microscale freestanding thin films at elevated temperatures were evaluated by means of optical microscopy/Digital Image Correlation (DIC) and Infrared (IR) imaging. The two methods employed uniform and resistive specimen heating. Optical images processed by DIC were used to calculate the strain along the specimen gauge section of specimens subjected to both experimental methods, while IR imaging was used to measure the temperature distribution along the specimens' gauge sections. The axial strain and temperature distributions were compared qualitatively to evaluate the efficacy of each method. Uniform specimen heating provided uniform temperature and axial strain distributions that were not affected in any measurable way by the use of the "cold" external probe employed to pull on the specimens. However, the resistively heated specimens had highly non-uniform temperature and axial strain distributions along their gauge sections. The associated high temperature gradients resulted in strain localization and significant reduction in yield and ultimate strength measured during resistive heating experiments compared to uniformly heated samples. The experiments revealed that the latter method provides high fidelity measurements at elevated temperatures.

Original languageEnglish (US)
Title of host publicationSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
Pages1493-1500
Number of pages8
StatePublished - Nov 9 2010
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010 - Indianapolis, IN, United States
Duration: Jun 7 2010Jun 10 2010

Publication series

NameSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
Volume2

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010
CountryUnited States
CityIndianapolis, IN
Period6/7/106/10/10

ASJC Scopus subject areas

  • Mechanics of Materials

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  • Cite this

    Karanjgaokar, N. J., Oh, C. S., & Chasiotis, I. (2010). Experimental methods for tensile testing of metallic thin films at high temperatures. In Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010 (pp. 1493-1500). (Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2010; Vol. 2).