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• W2965461145 abstract "We present a new strain-rate dependent elasto-viscoplastic damage constitutive model for cementitious materials by incorporating Duvaut-Lions viscoplasticity generalized to multi-surface plasticity (c.f. Simo et al., 1988b; Simo and Hughes, 1998) followed by strain-rate-dependent damage initiation and evolution under multiaxial loading, to our previous inviscid elastoplastic-damage model (Paliwal et al., 2017). We also present a unique numerical scheme in which the integration algorithm for modeling elastoplastic response utilizes fully implicit, backward Euler method in which the governing system of non-linear equations are solved in the space of invariants based on Haigh-Westergaard coordinate system, hardening parameter and discretized plastic multiplier. It uses the framework by (Matzenmiller and Taylor, 1994), which is modified in this work. This is particularly useful as the yield criteria, flow rule, and the non-linear hardening utilize functions that are dependent on the pressure, effective shear stress, and Lode angle components of the stress tensor. To the best of authors’ knowledge, such integration algorithm in Haigh-Westergaard coordinate space has never been developed for Lode angle dependent yield criteria and the flow rule, and non-linear hardening plasticity. Furthermore, we also develop an accurate form for the algorithmic elastoplastic-damage tangent modulus consistent with the proposed return mapping technique. Numerical simulations of uniaxial tension and compression cases demonstrate that both the local integration point algorithm as well as the global algorithm using the algorithmic elastoplastic-damage tangent modulus exhibit quadratic convergence. Finally, the predictive capability of the proposed model is demonstrated by virtue of several numerical examples under various loading conditions covering different stress paths and different dynamic strain-rates. These predictions are also compared against experimental results and experimentally observed features from tests on various concrete specimens, and demonstrate excellent agreement." @default.
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• W2965461145 date "2020-01-01" @default.
• W2965461145 modified "2023-09-26" @default.
• W2965461145 title "A three-invariant cap-viscoplastic rate-dependent-damage model for cementitious materials with return mapping integration in Haigh-Westergaard coordinate space" @default.
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• W2965461145 doi "https://doi.org/10.1016/j.ijsolstr.2019.07.029" @default.
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