BRITTLE FRACTURE PROPAGATION STUDIES.

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Abstract:

This investigation was undertaken to study lowvelocity brittle fracture in wide steel plates. The detailed results of two tests of 6-ft-wide prestressed steel plates are prsented along with pertinent observations from tests of similar specimens also, results of nineteen tests of 2-ft-wide centrally notched plates. In 6-ft-wide prestressed plates, the residual stress field longitudinal tensile stresses at the edges of the plate balanced by compressive stresses throughout the central portion made initiation possible with no external applied stress, and had a significant effect on the fracture propagation. Fracture speeds were high 4000-6000 fps near the edges of the plates and decreased rapidly to as low as l65 fps as the fracture propagated into the region of compressive stresses. In the lowspeed regions the magnitude and extent of the dynamic strain field associated with the crack tip was considerably less than had been recorded in earlier tests of high-speed fractures in plain plates. Author

Author(s):
Videon, F. F. ; Barton, F. W. ; Hall, W. J.
Author Organization(s):
ILLINOIS UNIV URBANA
Descriptive Note:
Progress rept. no. 1,
Supplementary Note:
Report on Low-Velocity Fracture. Also available from Office of Technical Services, Dept. of Commerce, Wash. 25, D. C., as PB 181 535
Pagination:
0035

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SSC-148
Contract/Grant Number(s):
NObs65790
Project Number(s):
SR-155
Monitor Series:
148
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*FRACTURE(MECHANICS), *BRITTLENESS, STEEL, FRACTURE(MECHANICS), FRACTURE(MECHANICS), SHEETS, TEST METHODS, STRAIN GAGES, WELDING, MEASUREMENT, EXPERIMENTAL DATA, TEMPERATURE, TIME, VELOCITY, SURFACES, METAL PLATES
Report Date:
1963 Aug 20