J. Phys. IV France 01 (1991) C3-645-C3-652
EXPERIMENTAL STUDIES OF SHEAR BAND FORMATION THROUGH TEMPERATURE MEASUREMENTS AND HIGH SPEED PHOTOGRAPHYJ. DUFFY
Brown University, Division of Engineering, Providence RI 02912, U.S.A.
Observations are made during dynamic deformation of metals leading to adiabatic shear banding. The tests include measurements of local strain and local temperature rise. The temperature measurements are performed using an may of infrared sensitive, semiconductor photodiodes giving an average temperature increase of up to 600°C. Ultra-high speed photography shows that localization begins gradually then narrows into a fine shear band with strains of 103 and strain rates of 105/s. Using the magnitude of geometric variations in the specimen as a parameter, analysis predicts with considerable accuracy the strain at which the shear band is triggered.
© EDP Sciences 1991