Affiliations: [a] State Key Laboratory for Strength and Vibration of
Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an,
Shaanxi, China | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Minglong Xu, State Key Laboratory for
Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an
Jiaotong University, Xi'an 710049, Shaanxi, China. Tel./Fax: +86 29 8266 9093;
E-mail: mlxu@ mail.xjtu.edu.cn
Abstract: A measuring system is presented to improve the volumetric strain
measurement in hydrostatic pressure environment for a hydro-compression loading
test. The measuring system consists of a new triaxial extensometer, a novel
contactless signal transmission system and an IPT (inductive power transfer)
equipment. By the extensometer, triaxial deformations of foam specimen can be
measured directly, from which the volumetric strain is determined.
Sensitivities of the triaxial extensometer are predicted using a simplified
analytical model, and verified through experimental calibrations. To avoid the
punching and lead sealing techniques on the pressure chamber for
hydro-compression loading and transfer the strain data of the triaxial
extensometer effectively, a new modus of contactless differential signaling is
developed in this paper for elimination of noise caused by the IPT.
Keywords: Measuring system, triaxial extensometer, volumetric stain, contactless signal transmission
