High-speed infrared thermal imaging during ballistic impact of triaxially braided composites
Autor: | Gary D. Roberts, Joel P. Johnston, Charles R. Ruggeri, J. Michael Pereira |
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Rok vydání: | 2018 |
Předmět: |
chemistry.chemical_classification
Materials science Projectile Mechanical Engineering 02 engineering and technology Polymer Penetration (firestop) 021001 nanoscience & nanotechnology Matrix (mathematics) 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials Materials Chemistry Ceramics and Composites Infrared thermal imaging Composite material 0210 nano-technology Ballistic impact |
Zdroj: | Journal of Composite Materials. 52:3549-3562 |
ISSN: | 1530-793X 0021-9983 |
Popis: | Ballistic impact experiments were performed on triaxially braided polymer matrix composites to study the heat generated in the material due to projectile velocity and penetration damage. Triaxially braided (0/+60/−60) composite panels were manufactured with T700S standard modulus carbon fiber and two epoxy resins. The PR520 (toughened) and 3502 (untoughened) resin systems were used to make different panels to study the effects of resin properties on temperature rise. The ballistic impact tests were conducted using a single stage gas gun, and different projectile velocities were applied to study the effect on the temperature results. Temperature contours were obtained from the back surface of the panel during the test through a high speed, infrared thermal imaging system. The contours show that high temperatures were locally generated and more pronounced along the axial tows for the T700S/PR520 composite panels; whereas, tests performed on T700S/3502 composite panels, using similar impact velocities, demonstrated a widespread area of lower temperature rises. Nondestructive, ultrasonic C-scan analyses were performed to observe the failure patterns in the impacted composite panels and correlate the C-scan results with the temperature contours. Overall, the impact experimentation showed temperatures exceeding 252℃ (485°F) in both composites which is well above the respective glass transition temperatures for the polymer constituents. This expresses the need for further high strain rate testing with measurement of the temperature and deformation fields in order to fully understand the complex behavior and failure of the material and to improve the confidence in designing aerospace components with these materials. |
Databáze: | OpenAIRE |
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