Apt strain measurement technique for impulsive loading applications. (25th January 2017)

• Record Type: Journal Article
• Authors: Nanda, Soumya Ranjan; Kulkarni, Vinayak; Sahoo, Niranjan
• Is Part Of: Measurement science & technology. Volume 28:Number 3(2017:Mar.)
• Publication Date: 2017-01-25
• Subjects: impulsive loading -- shock tube -- stress wave force balance -- strain measurement; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/1361-6501/aa577a
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: The necessity of precise measurement of strain time history for impulsive loading applications has been addressed in the present investigation. Finite element modeling is initially carried out for a hemispherical test model and stress bar assembly to arrive at an appropriate location for strain measurement. In dynamic calibration experiments, strain measurements are performed using two wire and three wire quarter bride arrangements along with half bridge circuit. Usefulness of these arrangements has been verified by analyzing strain signals in time and frequency domains. Comparison of recovered force time histories proved that the half bridge circuit is the most suitable for such applications. Actual shock tube testing of the instrumented hemispherical test model confirmed the applicability of half bridge circuit for short duration strain measurements.