Numerical Study on the Dynamic Fracture Energy of Concrete Based on a Rate-Dependent Cohesive Model

被引:3
作者
Zhang, Penglin [1 ]
Wu, Zhijun [1 ]
Liu, Yang [1 ]
Chu, Zhaofei [1 ]
机构
[1] Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
基金
美国国家科学基金会;
关键词
concrete material; fracture energy; high loading rate; cohesive model; failure mode; HIGH LOADING RATES; TENSILE-STRENGTH; SIMULATION; BEHAVIOR; IDENTIFICATION;
D O I
10.3390/ma14237421
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
As an important parameter for concrete, fracture energy is difficult to accurately measure in high loading rate tests due to the limitations of experimental devices and methods. Therefore, the utilization of numerical methods to study the dynamic fracture energy of concrete is a simple and promising choice. This paper presents a numerical investigation on the influence of loading rate on concrete fracture energy and cracking behaviors. A novel rate-dependent cohesive model, which was programmed as a user subroutine in the commercial explicit finite element solver LS-DYNA, is first proposed. After conducting mesh sensitivity analysis, the proposed model is calibrated against representative experimental data. Then, the underlying mechanisms of the increase in fracture energy due to a high strain rate are determined. The results illustrate that the higher fracture energy during dynamic tension loading is caused by the wider region of the damage zone and the increase in real fracture energy. As the loading rate increases, the wider region of the damage zone plays a leading role in increasing fracture energy. In addition, as the strain rate increases, the number of microcracks whose fracture mode is mixed mode increases, which has an obvious effect on the change in real fracture energy.
引用
收藏
页数:17
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