J. Phys. IV France 10 (2000) Pr9-835-Pr9-839
Photographic study of surface deformation during high-strain-rate torsion testing of high strength steelsN.A. Fellows1 and J. Harding2
1 School of Engineering, Oxford Brookes University, Gipsy Lane Campus, Headington, Oxford OX3 OBP, U.K.
2 Department of Engineering Science, University of Oxford, Oxford, U.K.
A photographic grid technique has been used to determine the specimen shear strain in Hopkinson-bar torsion tests on high strength steel specimens at a shear strain rate of ~ 1000/s. Shear strains at fracture were of the order of 5% and no localisation of plastic flow was observed immediately preceding fracture. The results are compared with those obtained previously for a lower strength RHA steel where the local shear strain immediately preceding fracture was of the order of 500%.
© EDP Sciences 2000