A high-temperature torsion apparatus for the high-resolution characterization of internal friction and creep in refractory metals and ceramics: Application to the seismic-frequency, dynamic response of Earth’s upper mantle

摘要: The design and performance of a compact apparatus for the characterization internal friction in simple shear at elevated temperature (⩽1400 °C) low frequencies (⩽1 Hz) are described. High-temperature components fabricated from refractory molybdenum alloy that is straightforwardly machined. has demonstrated, high temperature, torque resolution 2×10−5 N m an angular displacement 4×10−6 rad; specimen size we employ, these limits provide stress strain 2 kPa 5×10−7, respectively. apparatus, while applicable to dynamic static mechanical analyses any engineering material, was developed (attenuation) synthetic silicate aggregates representative Earth’s upper mantle; discuss constraints inherent required tests, as they affect (including materials selection) experimental protocol. Static data 1250 °C polycrys...