Description:
TECHNOLOGY AREA(S): Materials
OBJECTIVE: Develop an innovative and cost-effective laboratory-based methodology for obtaining dynamic material property measurements of carbon-carbon composite material responses under a range of energetic loadings to support first-principles hydro-codes modeling.
DESCRIPTION: This topic seeks carbon-carbon composite material data for high strain (strain to failure) and high strain rate (above 10^6 s^-1) loadings that is valid for a wide range of temperatures (25 degrees C up to well above 1000 degrees C). This data is needed to support hydro-code modeling and analysis of structural responses to energetic events such as explosions or high-velocity impacts where distortion of the structure is extreme and the time-scales are very short. Conventional material properties such as ultimate strength, yield strength, strain to failure, elastic modulus, etc., do not fully explain the behavior of carbon-carbon composite materials under extreme dynamic loadings which occurs during hypervelocity impact events. Materials characterization data is needed that allows for estimation of material properties like fracture energy and energy release rate as well as ultimate strength and fracture strains. In the case of impact loadings, impact surface morphology, failure mechanisms, and changes in fracture toughness are areas of interest. Impact testing is typically done using gas-gun testing, which is an expensive approach. A more cost-effective methodology is desired.
PHASE I: Develop an innovative and cost-effective solution for testing and measuring material properties of carbon-carbon composite materials under high strain/high strain rate loadings. This may include existing technology in new applications, as well as new approaches and measurement devices. In order to show feasibility, demonstrate the utility of the proposed approach through experiment, simulation, and analysis.
PHASE II: Demonstrate measurement performance, in a laboratory environment, to determine the material properties of carbon-carbon materials under higher strain-rate loadings (above 10^7 s^-1). The test methodology should include uncertainty quantification for material properties determined via testing. Hydro-codes use this uncertainty as an input to the modeling of energetic events.
PHASE III: Transition the measurement and characterization system from a developmental unit to a test asset and use it to provide test data for determination of material properties of carbon-carbon composite materials under high strain-rate loadings. This technology would benefit modeling and simulation across the aerospace and defense industries.
REFERENCES:
1: https://www.mda.mil/system/system.html.
2: Talreja, R. Composite materials Series, Damage Mechanics of Composite Materials, vol. 9, ch. 6, Elsevier, 199
3: Melis, et al. Reinforced Carbon-Carbon Subcomponent Flat Plate Impact Testing for Space Shuttle Orbiter Return to Flight, NASA/TM 2007-214384, September 200
4: Carney, et al. A Heterogeneous Constitutive Model for Reinforced Carbon-Carbon using LS-DYNA, 10th International LS-DYNA User’s Conference – Material Modeling, 200
5: Melis and Lyle. Impact Testing on Reinforced Carbon-Carbon Flat Panels With BX-265 and PDL-1034 External Tank Foam for the Space Shuttle Return to Flight Program, NASA TM 2009-213642, 200
KEYWORDS: Carbon-carbon, Dynamics, Test Methodologies, Dynamic Material Properties, High Strain-rate Testing, Impulsive Loadings, High-velocity Impact, Uncertainty Quantification
CONTACT(S):
Eric Luft
(256) 450-4881
Eric.Luft@mda.mil
