Analysis of Elastic-Plastic Ball Indentation to Measure Strength of High Strength Steels

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Abstract:

Ball indentation experiments were performed with A723 steel of 1000 to 1200 MPa ultimate strength. Results were compared with conventional tension tests and with an elastic-plastic finite element model of the ball indentation. Finite element analysis showed the ball indentation process to be insensitive to friction effects. Comparison of indentation and conventional tests showed that slip-line field analysis closely predicts the ball contact stress. Indentation tests gave an accurate measure of ultimate tensile strength under the following conditions using a large ball size and a fixed ratio of indentation depth to ball size ignoring initial ball contact accounting for directional material properties accounting for extraneous system deflections.

Author(s):
Underwood, J. H. ; O'hara, G. P. ; Zalinka, J. J.
Author Organization(s):
ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
Descriptive Note:
Final technical rept.
Supplementary Note:
Presented at SEM Spring Conference on Experimental Mechanics, Las Vegas, NV, 9-13 Jun 1985.
Pagination:
0038

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARLCB-TR-85029
Monitor Series:
ARLCB
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.2_Understand; JCA_1.2.7_Experimentation; JCA_1_Force Support; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Modernization Areas:
Quantum Science and Computing
Communities of Interest:
Weapons Technologies
Descriptor(s):
*TENSILE STRENGTH, *HIGH STRENGTH ALLOYS, *STEEL, FINITE ELEMENT ANALYSIS, DISPLACEMENT, ELASTIC PROPERTIES, RESIDUAL STRESS, TENSION, PLASTIC PROPERTIES, FRICTION, HARDNESS
Field(s)/Group(s):
Metallurgy and Metallography, Armor
Keyword(s):
BALL INDENTATION, STEEL A723, INDENTATION, SLIP LINE FIELD, CONTACT STRESS, LPN PRON 1A527P591A1A
Report Date:
1985 Aug 01