高延性水泥基复合材料拉伸开裂行为多尺度模拟研究进展  

Progress on Multi-Scale Simulation on Tensile Cracking Behavior of Engineered Cementitious Composites

作　　者：雷东移 武志盈 贾昊瑄 于龙 王冰[1] 汤金辉 李莹 李炎隆[3] 刘加平[2] LEI Dongyi;WU Zhiying;JIA Haoxuan;YU Long;WANG Bing;TANG Jinhui;LI Ying;LI Yanlong;LIU Jiaping(Department of Civil Engineering,Engineering Research Center of Concrete Technology under Marine Environment,Ministry of Education,Qingdao University of Technology,Qingdao 266520,Shandong,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;School of Water Resources and Hydropower,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]青岛理工大学土木工程学院,海洋环境混凝土技术教育部工程研究中心,山东青岛266520 [2]东南大学材料科学与工程学院,南京211189 [3]西安理工大学水利水电学院,西安710048

出　　处：《硅酸盐学报》2025年第1期173-189,共17页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(U23A20673,52478261,U22A20244);中国博士后科学基金面上项目(2024M750580);青岛西海岸新区科技计划惠民专项(2022-41,2021-102);青创科技支持计划(2021KJ045)。

摘　　要：高延性水泥基复合材料(ECC)克服了普通混凝土延性差、裂缝控制能力弱的缺点,当前针对混凝土断裂力学的机理分析主要依据微、宏观试验数据进行,但该过程耗时耗力且无法直观展示开裂过程中纤维–基体间的应力传递及异相物质间的分子或原子交互作用,而计算机模拟技术凭借高效、可视化、低成本的优势为精准预测、深入分析试验结果提供了强力支撑。为全面了解当前ECC拉伸开裂行为多尺度模拟的研究现状,将分子动力学、数值模拟(有限元模拟)、近场动力学和人工神经网络按纳、介、宏观3类尺度、4类方法分类概述其对ECC拉伸开裂行为的模拟。纳观尺度方面,分子动力学从分子或原子层面出发,着重分析未改性及改性纤维对ECC变形过程中纤维–基体界面结合性能的影响机理。介观尺度方面,数值(有限元)模拟重点关注纤维、基体及其界面特性等宏、细观因素对ECC拉伸应变硬化行为的影响规律。宏观尺度方面:近场动力学模拟针对ECC多缝开裂特性研究较少,其主要基于非局部作用分析了普通及纤维增强混凝土在不同方向荷载下的开裂演化行为;人工神经网络对ECC的力学性能预测有一定研究,但该方法主要通过建立预测模型,实现混凝土配合比设计并预测相关参数与力学性能之间的关联性。同时,论述了4种模拟技术在ECC拉伸开裂行为中的不足及发展趋势。Engineered cementitious composites(ECC)are widely used in masonry structure reinforcement,bridge deck connection and structural repair due to the strain hardening and multi-crack cracking characteristics,which can overcome some shortcomings as poor ductility and weak crack control ability from ordinary concrete.The existing mechanism analysis for concrete fracture mechanics is mainly based on the micro-and macro-experimental results.Although a research can obtain experimental data,the experimental process and result analysis are time-consuming and labor-intensive,and there is a huge deviation between the experimental results and the intended target.Computer simulation provides an effective research tool for accurately analyzing the working mechanism of cement-based composites.Computer simulation can accurately predict and deeply analyze the experiment results due to the advantages of high efficiency,visualization and low cost,which helps to better understand the achievement criteria of special properties for cement-based composites.The related research on the nano-,meso-,and macro-scopic cracking characteristics during the tensile process of ECC by computer simulation technologies in different scales becomes popular.However,there are a few systematic work for the characteristics,differences and correlations of different scale simulation methods on ECC.In the nano-scale simulation of ECC,the molecular dynamics(MD)can analyze the influence mechanism of unmodified fiber and modified fiber on the bonding performance at fiber-matrix interface during ECC deformation from the molecular or atomic level.MD can be used to establish the fiber/C-S-H interface molecular model,which can visually display the fiber-matrix interface bonding,and reveal that the interface bonding between unmodified/modified fibers,and C-S-H gel can be achieved via forming polymer,electrostatic interaction,chemical bond,hydrogen bond and the van der Waals force.In the mesoscopic scale simulation of ECC,the numerical(finite element)simulation can ana

关 键 词：高延性 拉伸应变硬化 分子动力学 数值(有限元) 近场动力学 人工神经网络 

分 类 号：TU528[建筑科学—建筑技术科学]