Abstract
An experiment to investigate the influence of biaxial strain on the dynamic fracture of metals is outlined. A hollow cylindrical specimen is loaded on the inner diameter by a polyethylene-coated exploding wire which results in a circumferential spallation pattern. Prior to fracture, the spall surface undergoes biaxial deformation with a total hoop strain of the same order of magnitude as the total radial strain. This is in contrast 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 surface 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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Rinehart, J. S., “Some Quantitative Data Bearing on the Scabbing of Metals Under Explosive Attack,”J. Appl. Phys.,22,555 (1951).
O’Brien, J. L., “The Fracture of Metals Under Impulsive Loading Conditions,” Harvard Univ., Div. of Engr. and Appl. Phys., Report NR-031-3866 (1961).
Blincow, D. W. andKeller, D. V., “Experiments on the Mechanism of Spall,”Dynamic Behavior of Materials, Am. Soc. for Testing Materials, Philadelphia, PA, 252–263 (1963).
Smith, J. H., “Three Low-Pressure Spall Thresholds in Copper,”Ibid.,,264–282.
Butcher, B. M., Barker, L. M., Munson, D. E. andLungergran, C. D., “Influence of Stress History on Time-Dependent Spall in Metals,”AIAA J.,2,997 (1964).
Tuler, F. R. and Butcher, B. M., “A Criterion for the Time Dependence of Dynamic Fracture,” Int. J. of Frac. Mech.,4 (4) (1968).
Swift, R. P. andFyfe, I. M., “Elastic/Viscoplastic Theory Examined Using Radial Cylindrical Stress Waves,”J. Appl. Mech.,37,1134 (Dec.1970).
Fyfe, I. M., “Plane-Strain Plastic Wave Propagation in a Dynamically Loaded Hollow Cylinder,”Mechanical Behavior of Materials Under Dynamic Loads, U. S. Lindholm, ed., Springer-Verlag, New York, 314 (1968).
Johnson, J. N. andBarker, L. M., “Dislocation Dynamics and Steady Plastic Wave Profiles in 6061-T6 Aluminum,”J. Appl. Phys.,40 (11),4321 (Oct.1969).
Christman, D. R. et al., “Measurements of Dynamic Properties of Materials,” 3,General Motors Technical Center, DASA 2501-3 (1971).
Kreer, J. R., “Dynamic Fracture in 6061-T6 Aluminum,” Kirtland AFB, AFWL-TR-70-180 (1971).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Schmidt, R.M., Fyfe, I.M. An examination of dynamic fracture under biaxial-strain conditions. Experimental Mechanics 13, 163–167 (1973). https://doi.org/10.1007/BF02322670
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02322670