CRACK INITIATION IN CRYSTALLINE MATERIALS.

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Abstract:

The influence of several macroscopic and microscopic parameters on the fracture of crystalline materials was studied on commercially pure tungsten, 2.5Al-16V titanium alloy and LiF single crystal specimens. Test results showed that the continuum mechanical maximum stress theory predicts the correct behavior of these materials when surface preparation techniques are identical. Microplasticity at the surface seems to influence the mode and stress for crack initiation and fracture. Bend test results on LiF showed that small cleavage cracks at the surface are not necessarily responsible for crack initiation. The actual dislocation process occuring at or near the surface was strongly dependent on the condition of the surface. Based on the equations of Neuber, the position of the maximum stress for an elliptical crack inclined at an arbitrary angle to the applied load was calculated. Author

Author(s):
Packman, P. ; Schroder, K. ; Weiss, V.
Author Organization(s):
SYRACUSE UNIV RESEARCH INST N Y
Descriptive Note:
Interim technical rept. no. 1,
Annotation:
Crack initiation in crystalline materials (W, Ti-2.5Al-16V alloy, LiF).
Pagination:
0125

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
1160 0764IT
Contract/Grant Number(s):
NOw-64-0275
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*FRACTURE(MECHANICS), *TUNGSTEN, *TITANIUM ALLOYS, *LITHIUM COMPOUNDS, FRACTURE(MECHANICS), FRACTURE(MECHANICS), FLUORIDES, CONTINUUM MECHANICS, SURFACE PROPERTIES, PLASTIC PROPERTIES, CRYSTAL DEFECTS, NUCLEATION, LOADS(FORCES)
Keyword(s):
TITANIUM ALLOY 2 5AL 16V
Report Date:
1964 Jul 01