A friction energy-based damage model for discrete element simulation of fatigue damage evolution in concrete

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-27 DOI:10.1016/j.conbuildmat.2024.139225

Pei Zhang , Chao Liu , Yang Liu , Xin Gu

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引用次数: 0

Abstract

The discrete results of concrete fatigue tests limit the research of concrete fatigue theory. Numerical simulation methods can model the damage of materials from multiple scales, which helps to reveal the fatigue damage mechanism and compensate for the inadequacy of physical tests. This study presents a novel damage model for simulating the fatigue damage evolution of cementitious materials within the framework of discrete element methods. The proposed friction energy-based fatigue damage model is underpinned by a clear fatigue damage mechanism and has only two independent parameters. The model underwent validation through a comparison between its predictions and the results of compression cycle tests performed on concrete specimens. The model reproduces the evolution characteristics of various fatigue damage indicators, including deformation, modulus, hysteretic energy, and number of cracks, and the fatigue damage accumulation rate presents sensitivity to the stress level. Furthermore, the model predicts a clear regularity in the fatigue damage thresholds, which is an important reference value for establishing fatigue failure criteria. The model can be used to predict fatigue life of fatigue tests with various maximum and minimum stress levels and the S-N curves obtained from the simulations fall within the range of test results.

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基于摩擦能的混凝土疲劳损伤离散元模拟模型

混凝土疲劳试验结果的离散性限制了混凝土疲劳理论的研究。数值模拟方法可以从多个尺度对材料的损伤进行建模，有助于揭示材料的疲劳损伤机理，弥补物理试验的不足。本文提出了一种在离散元方法框架下模拟胶凝材料疲劳损伤演化的新型损伤模型。提出的基于摩擦能的疲劳损伤模型具有明确的疲劳损伤机理，且只有两个独立的参数。通过对混凝土试件进行压缩循环试验，验证了该模型的预测结果。该模型再现了变形量、模量、滞回能、裂纹数等多种疲劳损伤指标的演化特征，疲劳损伤累积率对应力水平表现出敏感性。该模型预测疲劳损伤阈值具有明显的规律性，为建立疲劳破坏准则提供了重要的参考价值。该模型可用于各种最大、最小应力水平下疲劳试验的疲劳寿命预测，模拟得到的S-N曲线符合试验结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.