基于边界效应模型的sbs改性沥青混凝土尺寸无关断裂特性表征与预测

IF 3.2 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-06-15 DOI:10.1111/ffe.14699

Wanmei Gui, You Zhan, Yunduo Zhao, Xiaozhi Hu, Lan Wang, Chao Li, Fei Zhang

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引用次数: 0

摘要

为了表征高度非均质沥青混凝土结构的准脆性断裂行为，有必要确定与试件尺寸和裂纹尖端损伤区无关的断裂参数。本研究建立了一个边界效应模型，用于确定与尺寸无关的断裂参数-苯乙烯-丁二烯-苯乙烯（SBS）改性沥青混凝土的拉伸强度、断裂韧性和断裂能。这些参数直接来源于在- 10°C， 0°C和23°C，缺口深度为7和10 mm的小缺口三点弯曲试验中获得的峰值载荷。通过正态分布分析确定裂缝参数的均值、上限和下限，避免了曲线拟合。构造断裂曲线来评价断裂行为。此外，对满足线弹性断裂力学的峰值载荷预测和理论最小尺寸进行了量化。本文还分析了离散系数、离散数和平均晶粒尺寸对材料非均质性的影响。改进的边界元法能够直接根据峰值载荷精确预测断裂参数。在不同的缺口深度和温度下，验证了与尺寸无关的断裂参数。正态分布避免了拟合误差，提高了骨折评估的可靠性。通过反映沥青非均质性的离散度量来澄清准脆性行为

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查看原文本刊更多论文

Characterization and Prediction of Size-Independent Fracture Properties of SBS-Modified Asphalt Concrete Using a Boundary Effect Model

To characterize the quasi-brittle fracture behavior of highly heterogeneous asphalt concrete structures, it is essential to identify fracture parameters that are independent of specimen size and the crack-tip damage zone. This study develops a boundary effect model for determining size-independent fracture parameters—tensile strength, fracture toughness, and fracture energy—of Styrene-Butadiene-Styrene (SBS)-modified asphalt concretes. These parameters are directly derived from peak loads obtained in small notched three-point bending tests at −10 $^{°} C$ , 0 $^{°} C$ , and 23 $^{°} C$ , with notch depths of 7 and 10 $mm$ . The mean, upper, and lower limits of the fracture parameters are determined through normal distribution analysis, avoiding curve fitting. Structural fracture curves are constructed to evaluate the fracture behavior. Furthermore, the peak load predictions and theoretical minimum size meeting linear elastic fracture mechanics are quantified. The effects of discrete coefficients, discrete numbers, and average grain sizes are also analyzed to reflect the material's heterogeneity.

Summary

Improved BEM enables precise prediction of fracture parameters from peak load directly.
Size-independent fracture parameters are validated under varying notch depths and temperatures.
Normal distribution avoids fitting errors, enhancing the reliability of fracture assessment.
Quasi-brittle behavior clarified via discrete metrics reflecting asphalt heterogeneity

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.