A STUDY OF DYNAMIC NEAR-CRACK-TIP FRACTURE PARAMETERS BY DIGITAL IMAGE ANALYSIS W.H. Peters, W.F. Ranson, J.F. Kalthoff et S.R. Winkler J. Phys. Colloques, 46 C5 (1985) C5-631-C5-638 DOI: 10.1051/jphyscol:1985581