微机械有限元模型调查裂行为和青混合物的施工相关缺陷
Liu Yang1, Suwei Hou2, Haibo Yu2
1Zhengzhou Railway Vocational and Technical College, Zhengzhou 451460, China.
Materials (Basel, Switzerland)
|August 14, 2025
概括
微机械模型准确地预测了青断裂行为,超过了简单的模型. 这种先进的模拟有助于优化青混合物设计,并通过识别建筑缺陷的影响,如空气空洞,提高耐用性.
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:
- 青混合物是关键的路面材料,需要强大的断裂行为分析.
- 了解青对拉力负荷的反应对于路面的耐用性和性能至关重要.
- 现有的模型往往缺乏准确性来捕捉青中复杂的断裂机制.
研究的目的:
- 为了比较同质化和微机械有限元模型 (FEMs) 对青断裂的预测能力.
- 通过实验间接拉力试验 (IDT) 数据验证这些模型.
- 利用优质模型来评估建筑缺陷对青性能的影响.
主要方法:
- 基于凝聚性区域模型 (CZM) 的同质化和微机械有限元素模型 (FEM) 的开发和比较.
- 在间接拉伸负荷 (IDT) 下对五种青混合物的实验测试.
- 使用实验负载位移曲线对FEM进行校准和验证.
主要成果:
- 微机械FEM,随机聚合生成和三相材料定义,显示出明显更高的预测准确性 (R2 = 0.860.98) 比同质化模型 (R2 = 0.660.77).
- 模拟显示,空气空隙增加 (4%至10%),峰值负载降低高达35%,压力度增加高达40%.
- 不连续的分级和聚合物分离导致较早的裂开始和更复杂的断裂路径.
结论:
- 微机械有限元素建模 (FEM) 与同质化模型相比,为预测青断裂行为提供了更高的准确性.
- 这种先进的建模方法对于评估混合设计和压缩质量的灵敏性是有价值的.
- 这些发现为基于性能的青混合物优化和增强耐用性提供了基础.
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