Numéro
J. Phys. IV France
Volume 01, Numéro C3, Octobre 1991
DYMAT 1991 - 3rd International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) C3-645 - C3-652
DOI http://dx.doi.org/10.1051/jp4:1991390
DYMAT 1991 - 3rd International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 01 (1991) C3-645-C3-652

DOI: 10.1051/jp4:1991390

EXPERIMENTAL STUDIES OF SHEAR BAND FORMATION THROUGH TEMPERATURE MEASUREMENTS AND HIGH SPEED PHOTOGRAPHY

J. DUFFY

Brown University, Division of Engineering, Providence RI 02912, U.S.A.


Abstract
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