Accession Number : AD0717092

Title :   Dynamic Fracture in Metals under Biaxial Strain Conditions.

Descriptive Note : Technical rept.,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Schmidt,Robert M. ; Fyfe,Ian M.

Report Date : OCT 1970

Pagination or Media Count : 53

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 plane undergoes biaxial deformation with a total hoop strain of the same order of magnitude as the total radial strain. The role of plastic pre-straining on the fracture threshold is shown to be negligibly small as evidenced by a series of tests where the specimens were statically and dynamically prestrained in the radial, tangential, and axial directions. Kerr cell pictures of the coated exploding wires and dynamic flash X-rays of the specimens are included to demonstrate the axi-symmetry of both the loading and the spall phenomena. (Author)

Descriptors :   (*METALS, *FRACTURE(MECHANICS)), ALUMINUM ALLOYS, COPPER ALLOYS, STEEL, STRAIN(MECHANICS)

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE