使用计算机断层学和离散元素方法与间接拉伸测试的青混合物的半结构建模
Yunliang Li1, Qichen Wang1, Baocheng Liu1
1School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China.
Materials (Basel, Switzerland)
|June 13, 2025
概括
这项研究结合了计算机断层扫描 (CT) 和离散元素方法 (DEM) 来建模青混合物,揭示了强力链和聚合物-砂接口如何控制路面材料的裂和故障.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 计算力学 计算力学 计算力学
背景情况:
- 了解青混合物在负载下的行为对于路面的耐用性至关重要.
- 现有的模型往往简化了青复杂的中层结构,限制了预测准确度.
- 聚合物,青砂和空隙之间的相互作用显著影响机械反应.
研究的目的:
- 开发和验证使用计算机断层扫描 (CT) 和离散元素方法 (DEM) 对青混合物的中结构建模方法.
- 在间接拉力 (IDT) 负荷下调查SMA-13青混合物的内部力转移,裂传播和故障机制.
- 分析温度和负荷对内部力的影响,并确定抗裂的关键因素.
主要方法:
- 整合CT成像以实现现实的聚合体形态与DEM进行离散粒子模拟.
- 对SMA-13青混合物的间接拉力 (IDT) 试验的数值模拟.
- 模拟数据的后处理以识别力链,分析裂纹路径和量化内部力.
主要成果:
- 经过验证的CT-DEM模拟与实验IDT测试结果对比.
- 确定了主要的垂直和水平力链,控制骨折进展.
- 与砂相比,在聚合物骨中观察到更高的内部力,温度对两者都有显著影响.
- 描述了三个不同的阶段中裂变的演变,并确定了受裂变影响的区域.
- 突出了聚合物 - 砂界面过渡区在抗裂性方面的关键作用.
结论:
- CT-DEM方法准确地捕捉了青混合物的中结构行为.
- 强力链相互作用和聚合物 - 砂接口是青路面故障的关键决定因素.
- 温度和负载条件显著影响内部力分布和裂的启动/传播.
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