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Quasi-static and Dynamic Mechanical Response of T800/F3900 Composite in Tension and Shear

2018, Master of Science, Ohio State University, Mechanical Engineering.
Mechanical behavior of the composite material T800/F3900, a strengthened epoxy carbon-fiber reinforced polymer is investigated. Tension and shear tests are conducted on the composite at various strain rates. The objective of the project is to generate experimental data for calibrating MAT_213, a constitutive material model in the simulation software LS-DYNA. Material properties and strain rate effects are studied. In order to understand the influence of the constituent resin on the strain rate sensitivity of the composite, tension tests on the epoxy resin are also conducted. Two-dimensional or three-dimensional Digital Image Correlation (DIC) is used to measure full field strains in all tests.
Tension tests on the composite are conducted at nominal strain rates of 0.001 s-1, 1 s-1 and 1000 s-1. Dog bone specimens are machined from a 0.125’’ 16-ply panel with fibers in the transverse direction. Uniformity of strain distribution in the gage section is shown using DIC. Significant strain rate effect is seen when comparing the stress response in dynamic and quasi-static tests. At quasi-static strain rates of 0.001 s-1 and 1 s-1, the strain rate effect is minimal.
Tension tests on resin are conducted at nominal strain rates of 0.001 s-1 and 1000 s-1. Resin specimens have dog bone geometry in two planes and are machined from a 0.25’’ panel. Comparison of composite and resin tensile tests at quasi-static rates shows that the resin fails at a much higher strain than the composite. Dynamic tensile tests of the resin show force oscillations at regular intervals that correspond to wave reflections within the specimen. An estimated high strain rate response is presented. Strain rate effect is seen when comparing the stress response of the resin at the quasi-static and dynamic strain rates.
Shear tests on the composite are conducted at nominal strain rates of 0.001 s-1 and 1000 s-1. Double notch shear specimens are machined from a 0.125’’ 16-ply panel with fibers oriented in the transverse direction. A fixture assembly that can support the specimen during the tests and prevent movement and bending in the transverse and out-of-plane direction is used. Gage area strain obtained from DIC is observed to be a consistent measure of the shear strain in all shear tests. Quasi-static and dynamic material response is compared and significant strain rate effect is observed. The composite fails at a significantly higher stress and lower strain when tested at high strain rate.
Amos Gilat (Advisor)
Carlos Castro (Committee Member)
73 p.

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Deshpande, Y. (2018). Quasi-static and Dynamic Mechanical Response of T800/F3900 Composite in Tension and Shear. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Deshpande, Yogesh. "Quasi-static and Dynamic Mechanical Response of T800/F3900 Composite in Tension and Shear." Electronic Thesis or Dissertation. Ohio State University, 2018. OhioLINK Electronic Theses and Dissertations Center. 22 Oct 2018.

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Deshpande, Yogesh "Quasi-static and Dynamic Mechanical Response of T800/F3900 Composite in Tension and Shear." Electronic Thesis or Dissertation. Ohio State University, 2018. https://etd.ohiolink.edu/

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