Continuous Measurement of Surface Strain Distribution in Tensile Test of Circular Shaft Specimens Using Movie and Consideration of Stress-Strain Relation

Abstract

Non-contact and continuous measurement of surface displacement and surface strain distribution in circular shaft specimen during tensile test was investigated. Displacement distribution on the specimen surface was measured using digital image correlation (DIC) method based on a movie file taken during the test. Two cameras were used to measure displacement vertical to specimen surface. We considered correction method of surface strain measured by DIC using displacement vertical to surface. Surface strain during the tensile test was precisely measured and relation between stress and strain was investigated.