Interpretation of non-conventional miniaturized creep test: derivation of equivalent gauge length

• DOI: 10.1016/j.jmrt.2023.04.066
• Publication Date: 2023-04-13T10:54:57Z
• Authors: Wei Sun; Suo Li; Guo-Yan Zhou; Ming Li; Zhi-Xun Wen; Zhu-Feng Yue; Shan-Tung Tu
• Keywords: Mining engineering. Metallurgy; Data interpretation; Effective volume; TN1-997; Conversion parameters; Effect of geometry change; Steady-state creep

The objective of this paper is to clarify the nature equivalent gauge length miniaturized creep test methods. A mechanics-based approach was employed allow conventional uniaxial data be obtained from non-conventional tests, under steady-state creep. interpretation based on reference stress method. On basis, theoretical derivation lengths for a range miniature specimen types presented, including sub-size uniaxial, small punch, impression, rings, 2 bars, and bending beams plate. Then effect geometry change due conversion parameters evaluated. Finally, several practical aspects, related deformation modes, basis correlation methods, sensitivity "strain measurements", effective volumes, choice etc, are addressed.