Abstract
Biaxial strain transducers are suitable for simultaneous measurements of axial and transverse strains in uniaxial tensile tests. This paper describes a specific device where adjustment to different specimen widths is done by means of adjustable contacting screws. It is pointed out that the sensitivity of the axial sensors depends heavily on the screw position. This dependency is unfortunate as it complicates the calibration procedure and implies a potential risk of severe calibration errors. The performance of the transducer is modeled by simple beam theory combined with finite element calculations of two essential flexibilities. A calibration procedure based on the theoretical model is described, and experimental results for two different contacting screws are presented. A suggestion for a transducer design eliminating the problem is outlined.
Original language | English |
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Journal | Experimental Mechanics |
Volume | 36 |
Issue number | 3 |
Pages (from-to) | 218-223 |
ISSN | 0014-4851 |
DOIs | |
Publication status | Published - 1996 |