Abstract
The behavior of high performance fiber reinforced cementitious composites is simulated using semi-analytical and computational sub-models specified at multiple scales. At the scale of a single fiber, a semi-analytical model is developed to characterize the microslip behavior at the interface between the matrix and the fiber. The microcrack bridging and arresting mechanisms of fiber bundles is taken into account within the framework of linear elastic fracture mechanics. Upscaling from the level of distributed microcracks to the macroscopic level is achieved using continuum micromechanics. According to the proposed model, the macroscopic hardening and softening constitutive characteristics is resulting from the microcrack-fiber interaction, the microcrack growth and the evolution of the microcrack density. Model predictions for FRC concrete are validated against experimental data. For the finite element analyses of failure behavior at the structural level, interface solid elements supplemented by a fiber bridging law specified according to the fiber pull-out mechanics are used to represent the cracking process. Selected numerical examples demonstrate that the crack pattern as well as the structural response can be well replicated by the proposed model.
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Acknowledgements
Financial support was provided by the German Research Foundation (DFG) in the framework of project B2 of the Collaborative Research Center SFB 837. This support is gratefully acknowledged.
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Timothy, J.J., Iskhakov, T., Zhan, Y., Meschke, G. (2018). A Multiscale Model for High Performance FRC. In: Mechtcherine, V., Slowik, V., Kabele, P. (eds) Strain-Hardening Cement-Based Composites. SHCC 2017. RILEM Bookseries, vol 15. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1194-2_11
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DOI: https://doi.org/10.1007/978-94-024-1194-2_11
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