离散元法
聚结(物理)
材料科学
开裂
骨料(复合)
微观力学
计算机模拟
复合材料
数值分析
结构工程
纳米压痕
机械
岩土工程
地质学
工程类
数学
数学分析
物理
天体生物学
复合数
作者
Xiaolu Tan,Zhiyong Hu,Wengui Li,Shaoying Zhou,Tenglong Li
出处
期刊:Materials
[MDPI AG]
日期:2020-09-29
卷期号:13 (19): 4329-4329
被引量:15
摘要
This paper investigates the failure processes of recycled aggregate concrete by a model test and numerical simulations. A micromechanical numerical modeling approach to simulate the progressive cracking behavior of the modeled recycled aggregate concrete, considering its actual meso-structures, is established based on the discrete element method (DEM). The determination procedure of contact microparameters is analyzed, and a series of microscopic contact parameters for different components of modeled recycled aggregate concrete (MRAC) is calibrated using nanoindentation test results. The complete stress-strain curves, cracking process, and failure pattern of the numerical model are verified by the experimental results, proving their accuracy and validation. The initiation, growth, interaction, coalescence of microcracks, and subsequent macroscopic failure of the MRAC specimen are captured through DEM numerical simulations and compared with digital image correlation (DIC) results. The typical cracking modes controlled by meso-structures of MRAC are concluded according to numerical observations. A parameter study indicates the dominant influence of the macroscopic mechanical behaviors from the shear strength of the interfacial transition zones (ITZs).
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