An Examination Of Dynamic Fracture Under Biaxial-strain Conditions

Author:  Schmidt, R.M. and Fyfe, I.M.
Source:  SESA, Vol. XXX, No. 1
Doc ID:  1973035
Year of Publication:  1973
Abstract:  
An experiment to investigate the influence of biaxial strain on the dynamic fracture of metals is outlined. A hollow cylindrical sdpecimen is loaded on the inner diameter by a polyethylene coted exploding wire which results in a circumferential spallation pattern. Prior to fracture, the spall surface undergoes biaxial deformation with a total radial strain. This is in cntrast to earlier studies in which fracture induced by stress waves was examined in experiments which are characterized by uniaxial strain conditions. Comparing the results of the two configurations, it can be shown that the maximum principal stress history required to cause fracture is the same in both cases, although the stresses normal to the fracture susrface are quite different. High speed photographs of the coated exploding wires and dynamic flash x-rays of the specimens are included to demonstrate the axisymmetry of both the loading and the spall phenomenon.