Peridynamic modeling for impact failure of wet concrete considering the influence of saturation

TL;DR

This paper introduces a modified peridynamic model that accounts for the heterogeneity and porosity of wet concrete, enabling accurate simulation of impact failure considering saturation effects without increasing computational costs.

Contribution

The study develops a homogenized peridynamic model incorporating porosity and saturation effects, linking meso-structure to macroscopic behavior efficiently.

Findings

Model accurately predicts impact failure of wet concrete.

Porosity significantly influences mechanical properties.

Validation shows good agreement with experiments.

Abstract

In this paper, a modified intermediately homogenized peridynamic (IH-PD) model for analyzing impact failure of wet concrete has been presented under the configuration of ordinary state-based peridynamic theory. The meso-structural properties of concrete are linked to the macroscopic mechanical behavior in the IH-PD model, where the heterogeneity of concrete is taken into account, and the calculation cost does not increase. Simultaneously, the porosity of concrete is considered, which is implemented by deleting the bond between two material points, as well as the influence of porosity on the mechanical properties of concrete. Moreover, the effective bulk and shear modulus of cement mortar in wet concrete (saturated and unsaturated concrete) are calculated respectively. The dynamic model for wet concrete is described from three aspects: strength, dynamic increase factor, and equation of state. Validation of the proposed model is established through analyzing some benchmark tests and comparing with the corresponding experiment and other available numerical results.