Test System for Elevated Temperature Characterization of Thin Metallic Sheets

Thin gage Ni-based superalloy materials are being targeted for hypersonic applications up to 1100 degrees C. To achieve an optimized system design, standard mechanical behavior data on these materials are needed under a range of loading conditions such as tensile, creep, and fatigue at representative temperatures. These tests require direct measurements of displacements on specimens. In order to meet this need, a test system has been developed as part of a comprehensive in-house program to advance state-of-the-art testing capabilities for thin foils and very thin sheets. The test system was developed using a conventional hydraulic load frame outfitted with specialized capabilities, and was designed for determining material properties on a macro-scale. Specimen thicknesses used in this study range from 127-508 mu m, with specimen, lengths on the order of 150 mm. This paper outlines the developmental process, including unique challenges, along with the system validation and some preliminary data.