Abstract
The mechanical response of the carbon-epoxy material system HexPly IM7-8552 was investigated under transverse tension and combined transverse tension / in-plane shear loading at quasi-static and dynamic strain rates. The dynamic tests of the transverse tension and off-axis tension specimens were carried out on a split-Hopkinson tension bar system, while the quasi-static reference tests were performed on a standard electro-mechanical testing machine. Digital image correlation was used for data reduction at both strain rate regimes. For the high rate tests, the strain rate in loading direction was adjusted to reach approximately the same strain rate value in the fracture plane for each specimen. The measured axial strengths were transformed from the global coordinate system into the combined transverse tension-shear stress space of the material coordinate system and compared with the Puck Mode A criterion for inter-fibre failure. A good correlation between the experimental data and the predicted failure envelopes was found for both investigated strain rate regimes.
Highlights
Over the past years, the number of applications in which fibre reinforced polymer matrix composites (FRPMCs) are used in primary automotive (e.g. BMW i-project) and aeronautical (e.g. Airbus A350 and Boeing 787) structures has significantly increased
The mechanical response of the carbon-epoxy material system HexPly IM7-8552 was investigated under transverse tension and combined transverse tension / in-plane shear loading at quasi-static and dynamic strain rates
The measured axial strengths were transformed from the global coordinate system into the combined transverse tension-shear stress space of the material coordinate system and compared with the Puck Mode A criterion for inter-fibre failure
Summary
The number of applications in which fibre reinforced polymer matrix composites (FRPMCs) are used in primary automotive (e.g. BMW i-project) and aeronautical (e.g. Airbus A350 and Boeing 787) structures has significantly increased In both areas of applications, components may be subjected to high speed loading events such as crash or foreign object impact. The development of corresponding constitutive models and failure criteria requires an improved understanding of the mechanical behaviour of composites under high strain rate loading conditions, especially in the main material directions and under combined stress states. This critically needed data can be provided by high rate loading experiments such as the split-Hopkinson bar test. Together with the data of the present study, a comprehensive data set on the strain rate effect of the matrix dominated compressive and tensile response exists for this composite material system
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