Accession Number:

AD0255091

Title:

STUDIES OF BRITTLE-FRACTURE PROPAGATION IN SIX-FOOT-WIDE STEEL PLATES WITH A RESIDUAL STRAIN FIELD

Personal Author(s):

Corporate Author:

ILLINOIS UNIV URBANA

Report Date:

1961-04-03

Abstract:

Five plates were prepared and tested the residual strain field was produced by welding tapered slots cut in the edges of the specimen. The test results clearly showed that the high residual tensile strain at the initiation edge aided the fracture initiation. For specimens with no external applied load, the fractures arrested before completely crossing the specimens for specimens with external applied loads, even though low in magnitude, the fractures propagated completely across the plates. The recorded fracture speeds were much lower than any previously noted in tests of six-foot-wide plates, ranging from about 4000 fps near the initiation edge to as low as 50 fps in the compressive strain region. The strain response as measured by gages located at various points across the plate showed that the magnitude of peak strain and the size of the strain field associated with the moving crack tip diminished as the fracture propagated through the compressive strain field at reduced speeds. Author

Pages:

0001

Contract Number:

NOBS65790

File Size:

0.00MB

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