Authors: MR Stoudt L E Levine L Ma
Publish Date: 2016/09/13
Volume: 57, Issue: 1, Pages: 155-163
Abstract
We describe an innovative design for an inplane measurement technique that subjects thin sheet metal specimens to bidirectional loading The goal of this measurement is to provide the critical performance data necessary to validate complex predictions of the work hardening behavior during reversed uniaxial deformation In this approach all of the principal forces applied to the specimen are continually measured in realtime throughout the test This includes the lateral forces that are required to prevent out of plane displacements in the specimen that promote buckling This additional information will in turn improve the accuracy of the compensation for the friction generated between the antibucking guides and the specimen during compression The results from an initial series of experiments not only demonstrate that our approach is feasible but that it generates data with the accuracy necessary to quantify the directionallydependent changes in the yield behavior that occur when the strain path is reversed ie the Bauschinger EffectAll of the work described herein was performed at the National Institute of Standards and Technology and was supported by internal funding from the Materials Science and Engineering Division We would like to acknowledge D J Pitchure of the NIST Mechanical Performance Group for his helpful suggestions and assistance with the CAD modeling and C Amigo D Barry B Pries and J Kisner of the NIST Fabrication Technology Group for their collective expertise and advise offered during the fabrication of the numerous precision components in our apparatus
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