A versatile numerical approach for calculating the fracture toughness and R-curves of cellular materials

17 Mar 2020 Hsieh Meng-Ting Deshpande Vikram S. Valdevit Lorenzo

We develop a numerical methodology for the calculation of mode-I R-curves of brittle and elastoplastic lattice materials, and unveil the impact of lattice topology, relative density and constituent material behavior on the toughening response of 2D isotropic lattices. The approach is based on finite element calculations of the J-integral on a single-edge-notch-bend (SENB) specimen, with individual bars modeled as beams having a linear elastic or a power-law elasto-plastic constitutive behavior and a maximum strain-based damage model... (read more)

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