Fatigue cracking of cement-treated composites with mesoscale heterogeneous model

被引：0
|
作者：
Zhao X. [1 ,2 ]
Dong Q. [1 ,2 ]
Xiao Y. [3 ]
Du H. [1 ]
Jia Y. [1 ]
机构：
[1] School of Transportation, Southeast University, Nanjing
[2] National Demonstration Center for Experimental Road and Traffic Engineering Education(Southeast University), Nanjing
[3] School of Civil Engineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 09期
基金：
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
关键词：
Cement treated base(CTB); Discrete element method(DEM); Fatigue cracking; Material random field; Pavement engineering;
D O I：
10.11817/j.issn.1672-7207.2021.09.015
中图分类号：
学科分类号：
摘要：
To investigate the influence of microscopic heterogeneity on fatigue cracking behavior of cement-treated base(CTB) materials, firstly, mesoscale heterogeneous numerical model was established by discrete element method(DEM) and randomization algorithm. Secondly, digital image processing(DIP) technology was employed to reconstruct real specimen. Nano-indentation test was adopted to determine the material mechanical parameter distribution. Thirdly, based on DIP reconstruction model, the material parameters were obtained by inverse analysis. The parallel bond evolution method was also developed to characterize the time-dependent fatigue damage behavior under cyclic loading. Finally, based on the established mesoscale heterogeneous model, virtual semicircular bending strength and fatigue tests were carried out. The process of mesoscopic fatigue cracking was simulated and the influence of microscopic heterogeneity on fatigue cracking behavior was further studied. The results show that fatigue crack has experienced a process of smooth propagation and rapid penetration. Tension is the driving force of fatigue crack evolution. The interface of mortar-aggregate is the weak area of fatigue cracking. The fatigue damage presents nonlinear accumulation during cyclic loading and the relationship between stress and fatigue life is exponential function. The increase of tensile strength of mortar materials is the key measure to improve the fatigue crack resistance of structures. The material random field has significant influence on the fatigue fracture behavior of CTB. With the increase of the dispersion degree of material properties, the growth rate of fatigue damage decreases, the crack propagation path extends, and the total number of microcracks at fracture increases. As a result, CTB with significant heterogeneity will have a higher fatigue life at the same stress ratio level. However, excessively discrete material properties significantly reduce tensile strength, weaken bearing capacity of the structure, and reduce fatigue life. The reasonable control of the uniformity of mortar during construction is beneficial to improve the fatigue resistance of CTB materials. © 2021, Central South University Press. All right reserved.
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页码：3132 / 3142
页数：10
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