Dynamic Tensile Failure in Rocks

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Abstract:

The results of a two-year program on dynamic fracture behavior of rocks are described. The goal was to develop the capability to predict the fragment size distribution of rock resulting from known dynamic loads. This goal has been largely realized for a simple, well-characterized rock type, Arkansas novaculite, under one-dimensional-strain impact loading. A gas gun was used to accelerate flat plates against flat rock specimens. Ytterbium piezoresistive stress gages were used to measure stress histories, and the dynamic tensile strength and fragment size distributions were determined. The mechanism of fragmentation was deduced from fractographic observations on impacted specimens.

Author(s):
Shockey, Donald A. ; Petersen, Carl F. ; Curran, Donald R. ; Rosenberg, John T. ; Seaman, Lynn
Author Organization(s):
STANFORD RESEARCH INST MENLO PARK CA
Descriptive Note:
Final rept. 14 Feb 1972-26 Aug 1973
Pagination:
0074

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
H0220053, ARPA ORDER-1579
Project Number(s):
SRI-PYU-1793
Monitor Series:
DARPA
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_1.2.7_Experimentation; JCA_5_Command and Control; JCA_5.3_Planning; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_6.4.1_Secure Information Exchange; JCA_6_Net Centric; JCA_6.2.1_Information Sharing; JCA_6.2.2_Computing Services; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_5.2.2_Develop Knowledge and Situational Awareness; JCA_5.2_Understand; JCA_6.4_Information Assurance
Modernization Areas:
Microelectronics; Directed Energy; Autonomy
Communities of Interest:
Weapons Technologies
Descriptor(s):
*ROCK, CRACKS, FRACTURE(MECHANICS), FRAGMENTATION, LOADS(FORCES), MATHEMATICAL MODELS, PARTICLE SIZE, STRESSES, TENSILE PROPERTIES
Field(s)/Group(s):
Geology, Geochemistry and Mineralogy
Keyword(s):
NOVACULITE, COMPUTER AIDED ANALYSIS, *ROCK MECHANICS, DYNAMIC LOADS
Report Date:
1973 Jun 26