Simulating the chemical-mechanical-damage coupling problems of cement-based materials using an improved smoothed particle hydrodynamics method

The applications of Smoothed Particle Hydrodynamics (SPH) into the chemical - mechanical damage coupling problems of cement - based materials have been rarely investigated. Based on this background, the diffusion equations of chemical ion concentration in SPH form are derived. Traditional kernel function in SPH is improved by introducing the ion concentration damage coefficient Dc. Firstly, the chemical corrosion processes of a semicircular corrosion pit are simulated, and the rationality is verified by comparing with previous experimental results. Then the effects of different bedding direction, random aggregates and their anisotropy degrees on the chemical corrosion processes are discussed. Finally, a chemical-stress-damage coupling model is established to simulate the crack propagation processes. The research results can provide some references for the comprehensive understandings of the chemical-stress-damage coupling laws, as well as the applications of SPH method into the chemical-stress-damage coupling simulations of cement-based materials.

Automated summary

This study investigates the application of Smoothed Particle Hydrodynamics (SPH) to the chemical-mechanical damage coupling problems in cement-based materials. The diffusion equations for chemical ion concentration in SPH form are derived, with an improved kernel function that includes the ion concentration damage coefficient Dc. The simulation of chemical corrosion processes in a semicircular corrosion pit is performed, and the rationality is verified by comparing with previous experimental results. The effects of bedding direction, random aggregates, and their anisotropy degrees on the chemical corrosion processes are also discussed. A chemical-stress-damage coupling model is established to simulate crack propagation processes. This research provides references for understanding the coupling laws of chemical-stress-damage and the applications of SPH method in the simulations of cement-based materials.