THE MECHANICS OF CRACK ARREST IN MILD STEEL.

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Abstract:

Dynamic K sub IC values for mild steel were measured using instrumented impact bend tests containing fatigued notches and compared with the stress intensity values in a Robertson crack arrest test. It is proposed that crack arrest occurs by the initial slowing down of the crack due to increased temperature which leads to a dramatic deceleration due to the large strain-rate sensitivity of the material. When the strain rate at the crack tip is maintained by dynamic loading which causes forced crack propagation, the crack will remain brittle to much higher temperatures than the crack arrest temperature. Author

Author(s):
Wilshaw, T. R. ; Harris, D. O.
Author Organization(s):
STANFORD UNIV CALIF DEPT OF MATERIALS SCIENCE
Descriptive Note:
Technical rept.,
Pagination:
0016

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SU-DMS-68-T-25, AROD-4800:10-MC
Contract/Grant Number(s):
DA-31-124-ARO(D)-251
Project Number(s):
DA-20014501B32D
Monitor Series:
4800:10-MC
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*STEEL, MECHANICAL PROPERTIES), (*CRACK PROPAGATION, MECHANICS), STRAIN(MECHANICS), IMPACT TESTS, FRACTURE(MECHANICS), TEMPERATURE, DEFORMATION, TOUGHNESS, STRESSES, TENSILE PROPERTIES, PLASTIC PROPERTIES, INTENSITY, PHOTOGRAPHS, SENSITIVITY, NITROGEN
Field(s)/Group(s):
Metallurgy and Metallography, Mechanics
Report Date:
1967 Nov 01