Journal of Physics E Scientific Instruments · 1974 · 33 citations · 2 references
EngineeringMechanical EngineeringEquipmentInstrumentationMechanical Behavior Of MaterialsMachine TestingMechanical MeasurementStrain AnalysisStrain MeasurementStrain Rate EffectsStress-strain BehaviorRate-dependent DeformationStiffnessStrain-rate DependenceStress MeasurementTest Cycle Development
The influence of machine stiffness on specimen strain rate is examined. The paper presents a simple device that enables a constant true strain rate in compression or tension using an Instron variable speed unit. The device allows rapid adjustment of strain rate during a test, selecting new rates from 0.5 to 2.0 times the initial rate. Strain rate changes are achieved in 70 ms with no discontinuities.
A simple device is described for use with the Instron variable speed unit to produce a constant true strain rate in compression or tension. The device includes a facility for making small strain rate changes during a test cycle. The new strain rate is selected from two arbitrary levels ranging from 0.5 to 2.0 times the initial strain rate. The changes are accomplished in 70 ms and are achieved without discontinuities in strain rate. The effect of machine stiffness on the specimen strain rate obtained with this apparatus is also discussed.
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