Abstract:A dynamic crash model is developed and implemented to model the failure behavior and energy absorption of braided composite structures. Part I describes the development and theoretical foundation of a viscoplastic material model that captures the rate-dependent behavior present in braided composite materials. Part II presents the implementation of the model into a FEM program and contains experimental results for tubes crushed from quasi-static rate to 4000 mm/s rates used to verify the model. The model is pre… Show more
“…It is important to note that those models attend to fully find out the parameters that primarily affect the impact energy absorption of a composite material. Flesher et al (2011) implemented a material model with viscoplastic constitutive behavior and other significant material phenomena to simulate the crash performance of braided composite tubes. And they concluded that the variation of tube structure, braid geometry, and matrix strength in the model will affect the specific energy absorption of braided composite cubes.…”
This paper reports the ballistic energy absorption of three-dimensional angle-interlock composite (3DAWC) based on a ballistic experiment and a theoretical model with high strain rate constitutive equation of fiber tows. The 3DAWC panels were penetrated under a hemispherical-cylindrical steel projectile, while time testers recorded the initial velocities and residual velocities of projectile in this process. The damage modes of 3DAWC are observed and analyzed from the view of penetrated damage morphologies and experimental velocity data. In order to demonstrate the energy absorption mechanism with more accuracy, a multi-scale finite element model of 3DAWC under ballistic penetration is specially designed and established to calculate this ballistic event. The constitutive relationship of the Twaron Õ filament yarn in microstructural model is derived from the springs and dashpots model and compiled into user-defined material subroutine in commercial-available finite element software package LS-DYNA, which can introduce strain rate sensitivity of fiber bundles to ballistic energy absorption process. A comparison of theoretical and experimental results shows a good agreement indicating an accurate validity of the multi-scale finite element model of 3DAWC. Moreover, this model can deeply reveal the ballistic energy absorption mechanism of 3DAWC which will help to evaluate the structural tolerance of ballistic protection composite material.Keywords 3D angle-interlock woven composite (3DAWC), multi-scale finite element model, energy absorption, damage mechanism, ballistic penetration International Journal of Damage Mechanics 0(0) 1-18
“…It is important to note that those models attend to fully find out the parameters that primarily affect the impact energy absorption of a composite material. Flesher et al (2011) implemented a material model with viscoplastic constitutive behavior and other significant material phenomena to simulate the crash performance of braided composite tubes. And they concluded that the variation of tube structure, braid geometry, and matrix strength in the model will affect the specific energy absorption of braided composite cubes.…”
This paper reports the ballistic energy absorption of three-dimensional angle-interlock composite (3DAWC) based on a ballistic experiment and a theoretical model with high strain rate constitutive equation of fiber tows. The 3DAWC panels were penetrated under a hemispherical-cylindrical steel projectile, while time testers recorded the initial velocities and residual velocities of projectile in this process. The damage modes of 3DAWC are observed and analyzed from the view of penetrated damage morphologies and experimental velocity data. In order to demonstrate the energy absorption mechanism with more accuracy, a multi-scale finite element model of 3DAWC under ballistic penetration is specially designed and established to calculate this ballistic event. The constitutive relationship of the Twaron Õ filament yarn in microstructural model is derived from the springs and dashpots model and compiled into user-defined material subroutine in commercial-available finite element software package LS-DYNA, which can introduce strain rate sensitivity of fiber bundles to ballistic energy absorption process. A comparison of theoretical and experimental results shows a good agreement indicating an accurate validity of the multi-scale finite element model of 3DAWC. Moreover, this model can deeply reveal the ballistic energy absorption mechanism of 3DAWC which will help to evaluate the structural tolerance of ballistic protection composite material.Keywords 3D angle-interlock woven composite (3DAWC), multi-scale finite element model, energy absorption, damage mechanism, ballistic penetration International Journal of Damage Mechanics 0(0) 1-18
“…Other parameters, namely, the strength of different directions, were obtained from earlier studies by the SACL members. 30–32 Table 2 summarizes the material properties as the input parameters for the material model.Figure 4.Carbon fiber composite facesheet tensile experiment results.…”
Section: Model Development and Calibrationmentioning
“…To model the thermal-mechanical coupled constitutive behavior of 3-D braided composite manufactured by carbon fiber and epoxy resin under transverse impact compression loading at different temperatures, a temperature-dependent and rate-dependent material model is developed from the works [20][21][22][23][24].…”
This paper presents a thermal-mechanical coupled constitutive model to calculate the stress and temperature distribution of 3D braided composite under impact compressions in high temperature environment. The temperature effect and strain rate effect are involved in the coupled model. A temperature-rise equation in adiabatic state is derived to calculate the temperature rise during the impact compression. A user-defined subroutine was written for numerically simulating the impact damage with finite element method (FEM). The sensitivity of mesh size on the results was analyzed. The results reveal the temperature rise and the coupling stress of the 3D braided composite under different impact compression conditions, i.e., temperatures and compressive loadings.
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