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Prediction of Specimen Strain from Extensometer Deflection Measurements in a Direct Stress Fatigue Test Specimen under Static Tensile Loading

Arora, PR and Raghavan, MR (1988) Prediction of Specimen Strain from Extensometer Deflection Measurements in a Direct Stress Fatigue Test Specimen under Static Tensile Loading. In: Journal of Testing and Evaluation, 16 (4). pp. 386-391.

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Official URL: http://www.astm.org/DIGITAL_LIBRARY/JOURNALS/TESTE...

Abstract

The displacement between the ridges situated outside the filleted test section of an axially loaded unnotched specimen is computed from the axial load and shape of the specimen and compared with extensometer deflection data obtained from experiments. The effect of prestrain on the extensometer deflection versus specimen strain curve has been studied experimentally and analytically. An analytical study shows that an increase in the slope of the stress-strain curve in the inelastic region increases the slope of the corresponding computed extensometer deflection versus specimen strain curve. A mathematical model has been developed which uses a modified length ¯ℓef in place of the actual length of the uniform diameter test section of the specimen. This model predicts the extensometer deflection within 5% of the corresponding experimental value. This method has been successfully used by the authors to evolve an iterative procedure for predicting the cyclic specimen strain in axial fatigue tests on unnotched specimens.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to ASTM International.
Keywords: Specimen strain,ridges,test section,extensometer deflection, tensile prestrain,calibration.
Department/Centre: Others
Date Deposited: 29 Sep 2010 10:02
Last Modified: 29 Sep 2010 10:02
URI: http://eprints.iisc.ernet.in/id/eprint/32505

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