超大颗粒尺寸青混合物的疲劳裂纹特性在温度和负载下使用数字图像相关技术的数字图像相关技术
Tian Tian1,2,3, Yingjun Jiang3, Yong Yi3,4
1School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830039, China.
Materials (Basel, Switzerland)
|April 24, 2025
概括
这项研究检查了在温度和压力下青裂变,开发了一个模型来预测疲劳寿命. 这些发现有助于在使用超大粒度青混合物 (LSAM-50) 设计耐气候路面.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 铺路工程 铺路工程是指铺路工程.
背景情况:
- 在青路面上的疲劳裂是主要的故障机制.
- 超大粒度青混合物 (LSAM-50) 提供了潜在的好处,但需要进行彻底的疲劳分析.
- 了解温度和压力对疲劳的影响对于路面的耐用性至关重要.
研究的目的:
- 在温度和应力相结合的情况下,对LSAM-50的疲劳裂变行为进行定量调查.
- 为LSAM-50开发一个预测性疲劳模型,包括环境和负载因素.
- 为优化LSAM-50在路面设计中的气候弹性提供见解.
主要方法:
- 对LSAM-50进行了疲劳测试,温度为-15°C至35°C,压力水平为0.3-0.9.
- 数字图像相关性 (DIC) 用于实时跟踪裂演变.
- 分析了关键裂参数 (长度,密度,曲率,碎形尺寸) 和应变.
主要成果:
- 疲劳裂纹遵循一个三阶段的过程:启动,发展和加速.
- 温度升高和压力加快了裂的生长和应变积累.
- 建立了一个疲劳预测模型 (LgN = 9.741 - 1.213Lgε - 0.017T - 1.579S),其中R2 = 0.954.
- 该模型预测,在S=0.7.7的情况下,疲劳寿命将从15°C降低60%至35°C.
结论:
- 开发的疲劳模型准确地预测了在不同条件下LSAM-50的性能.
- 研究结果支持在气候适应性基础设施设计中使用LSAM-50.
- 这项研究为优化青路面材料和设计提供了关键的工具.
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