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Error analysis and method of accuracy evaluation of strain gauge factor testing apparatus based on pure bending moment beams
Author(s) -
Zubin Deng
Publication year - 1999
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.1999.tb01138.x
Subject(s) - strain gauge , deflection (physics) , beam (structure) , bending moment , calibration , bent molecular geometry , structural engineering , gauge (firearms) , imperfect , moment (physics) , pure bending , bending , engineering drawing , computer science , engineering , optics , mathematics , physics , materials science , classical mechanics , statistics , linguistics , philosophy , metallurgy
For the appraisal of accuracy of strain gauge factor testing apparatus based on pure bending moment beams, the common means adopted since the 1960s and still in use internationally today are by application of the strain definition to measure directly the strain on the calibration beam surfaces. However, because of the imperfect measuring principle and inadequate resolution and accuracy of instruments available, etc., this problem has not been solved satisfactorily. This paper proposes a unique way by introducing two new concepts, i.e. the shape errors of the cylindrical surfaces and deflection errors of the bent calibration beam, in accordance with the features of the forces acting on the beam, and the geometric shape and dimensions of the beam in operation, to analyse and classify the various accidental and systematic errors involved. Through the two concepts, the task of appraisal of accuracy is simplified as the appraisal of the cylindricality of the cylindrical surfaces of the bent calibration beam and the appraisal of the three main parameters in the strain formula.