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Accession Number ADA566369
Title Mechanical Response of Polycarbonate with Strength Model Fits.
Publication Date Feb 2012
Media Count 32p
Personal Author A. Dwivedi D. Casem J. Bradley
Abstract Experiments were conducted on polycarbonate to investigate how the material responds mechanically at varying deformation rates and elevated temperatures. The data was then used to determine parameters for the Johnson- Cook strength model and the Zerilli-Armstrong polymer strength model. Quasi- static tests were conducted at strain rates between 0.005/s and 0.4/s using a servo-hydraulic load frame. Dynamic compression experiments were performed using the Split Hopkinson Pressure Bar and resulted in strain rates between 1750/s and 15,000/s. Pre-heated specimens were tested in both setups to determine the effects of thermal softening. The results indicate that the material response is rate sensitive with an enhanced hardening at rates greater than 10/s. Predictably, tests conducted at elevated temperatures cause a decrease in the apparent yield and flow stress. Model fits to the data are shown to provide a reasonable approximation of real world behavior.
Keywords Amorphous polymers
Flow stress
High temperature
Kolsky bar
Mechanical properties
Polymer modeling
Polymer polycarbonate
Polymer testing
Rate effect
Room temperature
Strain rate
Temperature effect
Tensile tests
Thermal softening
Thermoplastic resins
Transparent armor
Transparent materials
Uniaxial stress

Source Agency Non Paid ADAS
NTIS Subject Category 99C - Polymer Chemistry
71 - Materials Sciences
46E - Structural Mechanics
Corporate Author Dynamic Science, Inc., Aberdeen, MD.
Document Type Technical report
Title Note Final rept. Oct 2010-Oct 2011.
NTIS Issue Number 1307
Contract Number W911QX-09-C-0057

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