Data Acquisition System for High Strain Fatigue Testing
This paper describes a data acquisition system for use in material tests on tubular steel specimens. These were subjected to combinations of three types of loading i. e. 1) Axial tension and compression, 2) Cyclic Torsion, 3) Internal Pressure.
Test were performed at particular loading rates in which essentially loads and displacements were required to be measured. Loads were measured via strain gauge bridges and displacements by Rotary and Linear Variable Differential Transformers (RVDT’s and LVDT’s). Fine control of strains and displacements was obtained using stepper motors.
The stepper motor control and data acquisition systems were based around a Gemini 64K micro-computer. The system was to be capable of sampling sufficient data within each cycle to allow cyclic stress-strain curves to be defined.
KeywordsData Acquisition System Linear Variable Differential Transformer Hoop Strain Cyclic Plastic Strain Cyclic Torsion
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