Test System for Elevated Temperature Characterization of Thin Metallic Foils (Preprint)

摘要

The need to accurately determine the mechanical properties of thin metallic foil materials has grown in recent years as the emphasis on hypersonic vehicles and access to space has also increased. These foils, with thicknesses ranging from 75-250 mum, are used in the fabrication of metallic sandwich panels consisting of honeycomb structures, which are used for thermal protection of numerous space and hypersonic vehicles. Typically, these panels are designed with material properties determined using sheet data (thickness greater or equal to 1000 mum) due to the lack of data available for the foil product form. Limited data are available in the open literature for foil gage metals. El-Soudani reported the properties of foil gage (254 mum) specially processed Ti-6242S up to 593 deg C. Zupan used microsamples to characterize the tensile behavior of thin gage Gamma TiAl. Moreau et al. used a four-point bend testing configuration to study the effect of thickness on yield strength of nickel foils at room temperature. Lara-Curzio et al. studied the effect of thermal exposure on the tensile behavior of a Ni-base superalloy, Haynes 230(R).