TY  - EJOU
AU  - Sheng, Zhishui 
AU  - Jiang, Hong 
AU  - Liu, Gang 
AU  - Zhang, Fulai 
AU  - Zhang, Wei 

TI  - Study on the Dynamic Mechanical Damage Behavior of Concrete Based on the Phase-Field Model
T2  - Structural Durability \& Health Monitoring

PY  - 2025
VL  - 19
IS  - 3
SN  - 1930-2991

AB  - Concrete materials are employed extensively in a variety of large-scale structures due to their economic viability and superior mechanical properties. During the service life of concrete structures, they are inevitably subjected to damage from impact loading from natural disasters, such as earthquakes and storms. In recent years, the phase-field model has demonstrated exceptional capability in predicting the stochastic initiation, propagation, and bifurcation of cracks in materials. This study employs a phase-field model to focus on the rate dependency and failure response of concrete under impact deformation. A viscosity coefficient is introduced within the phase-field model to characterize the viscous behavior of dynamic crack propagation in concrete. The rate-dependent cohesive strength is defined within the yield function of concrete, where the rate sensitivity of cohesive strength facilitates the accumulation of the plastic driving force in the phase-field model. This process effectively captures the impact failure response of concrete. The applicability of the model was validated through unit cell experiments and numerical simulations of concrete under impact compression. Furthermore, the mechanical response and damage evolution mechanisms of concrete under impact loading were analyzed. It was observed that crack propagation in concrete initiates at material defects and, with increasing load, eventually develops in a direction perpendicular to the loading axis.
KW  - Impact loading; phase-field model; dynamic crack propagation; rate-dependent elastoplastic constitutive model

DO  - 10.32604/sdhm.2024.059662