Simulating Tensile and Compressive Failure Process of Concrete with a User-defined Bonded-Particle Model

Abstract

A user-defined bonded-particle model (UBM) which is based on the modified parallel bond was established in this paper to investigate the tensile and compressive failure mechanism of concrete on the three-dimensional (3D) level. The contact constitutive relation and the failure criterion of the UBM can be added to the commercial discrete element software PFC 3D by compiling them as a dynamic link library file and loading it into PFC 3D whenever needed. In addition, the aggregate particles can be generated according to the volume fraction and the shape of each aggregate is irregular. Then, by comparing the results of numerical simulation with the results of laboratory tests, it is found that this bonded-particle model can simulate the tensile and compressive failure process of concrete well to a certain extent. Specifically, the two have basically similar failure patterns and stress-strain responses no matter under tension or compression loading condition. All results indicate that this UBM is a promising tool in understanding and predicting the tensile and compressive failure process of concrete. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

An Extension Strain Type Mohr–Coulomb Criterion

“…In tensile stress fields, extensional strain is realized directly in the loading direction, whereas in compressive stress fields, extensional strain is realized indirectly and orthogonal to the loading direction through a complex interaction of micromechanical processes, which depend on the heterogeneity of the microstructure (Klerck et al 2004). In compression tests, the indirect extension by the Poisson effect produces an order more cracks at lower strains compared with the direct extension in tensile tests (Ren et al 2018). Therefore, different damage models in tension and compression may be needed.…”

“…3.2.1. It is observed in rock or shown in simulations with a bonded-particle model of concrete that in compression tests, the extension by the Poisson effect produces an order more cracks at lower strains compared with the direct extension in tensile tests (Ren et al 2018). Therefore, the use of T in Eq.…”

Convolutional Neural Network for Predicting Failure Type in Concrete Cylinders During Compression Testing

“…However, it is susceptible to moisture, corrosion of reinforcement, high temperature, overloading, and differential settlement of soil, which causes cracks in its structure to appear in the stress zones [2,3], which show deterioration and affect the safety, workability, and durability of concrete structures [4]. Research has deepened the study of its mechanical properties [5], being the compressive strength and the type of failure the most evaluated properties, through laboratory tests where the preparation of concrete cylinders of 150×300 mm (ASTM C-172) is performed to be evaluated in a hydraulic press (ASTM C-39).…”

“…Therefore, the speed and accuracy of classification algorithms constitute key elements for the detection of damage in concrete. Several methods use deep learning models that automate the process [5,12], using inspection techniques based on computer vision for the classification of crack types [7].…”