An Analysis of Parameters for the Johnson-Cook Strength Model for 2-in-Thick Rolled Homogeneous Armor

An Analysis of Parameters for the Johnson-Cook Strength Model for 2-in-Thick Rolled Homogeneous Armor

Yield strength obtained from quasi-static strength data for rolled homogeneous armor (RHA) was combined with dynamic strength data for 2-in (51-mm) RHA to generate Johnson-Cook parameters for 2-in RHA. One parameter was fixed based on the quasi-static strength data, and a least-squares method was us...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Meyer, Jr , Hubert W, Kleponis, David S
Format: Report
Sprache:eng
Schlagworte:
Armor
ARMOR PLATE
BALLISTICS
COMPUTERIZED SIMULATION
CTH COMPUTER PROGRAM
DYNAMICS
EXPERIMENTAL DATA
JOHNSON-COOK STRENGTH MODEL
LEAST SQUARES METHOD
PARAMETRIC ANALYSIS
PENETRATION
ROLLED HOMOGENEOUS ARMOR
STATICS
STRESS STRAIN RELATIONS
TENSILE PROPERTIES
Theoretical Mathematics
YIELD STRENGTH
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Beschreibung
Zusammenfassung:Yield strength obtained from quasi-static strength data for rolled homogeneous armor (RHA) was combined with dynamic strength data for 2-in (51-mm) RHA to generate Johnson-Cook parameters for 2-in RHA. One parameter was fixed based on the quasi-static strength data, and a least-squares method was used to fit the others individually. The fit was tested with CHT by simulating the penetration of stacks of 2.5-in-thick (63.5-mm) RHA plates (the closest available experimental data). Parameter analysis and comparison of the simulations to experiment substantiated the approach. --Original contains color plates: All DTIC reproductions will be in black and white.