Numerical and experimental development of an “Accelerated Repeated Rolling Wheel Load Simulator” (ARROWS)

“加速重复滚轮负载模拟器”（ARROWS）的数值和实验开发

• 批准号: 414936990
• 负责人: Professor Dr.-Ing. Michael Kaliske
• 金额: --
• 依托单位: Lehrstuhl und Institut für Straßenwesen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/414936990?language=en
• 关键词: Numerical; experimental; development; Accelerated; Repeated

In the mechanistic design of flexible pavements under consideration of moving loads, particular attention is paid to achieving a realistic description of fatigue phenomena in asphalt layers due to tensile stresses. If the resulting external loading exceeds the fatigue resistance of the asphalt, fatigue cracking occurs. The initiation of micro and macro cracks is highly temperature dependant as well as stress dependant. However, current experimental setups exhibit stress states and mechanisms of crack propagation that differ strongly from those present in real pavements. Numerical approaches are limited to a reproduction and depiction of single components of the underlying phenomena or generally require further development to allow for applicable results. Therefore, the proposed research project a numerical-experimental approach and a realistic reproduction of loading conditions of asphalt layers under moving loads are pursued. The numerical and experimental development of an “Accelerated Repeated Rolling Wheel Load Simulator” (ARROWS) represents the core of the research project and aims to allow for accurate knowledge on the service life as well as the fatigue susceptibility of pavement structures with asphalt layers. The focus is on realising a realistic depiction of crack formation and crack propagation under real loading scenarios including magnitude, loading velocity and loading progressions.In the initial phase of the joint research project a numerical validation (simulation of the loading conditions from stationary tyre passes and due to the developed ARROWS testing device) shall be provided and the respective loading conditions are to be compared with one another. Simultaneously, the numerical conception of the testing device is carried out (design details, operative stability). Furthermore, the experimental conception of the device will be further developed. The focus of the research project is the experimental characterisation and the numerical representation of damage and healing phenomena of asphalt mixtures in pavements under moving loads. Based on this, a numerical model shall be developed to allow for long term predictions with a large number of loading cycles and long test durations. Experiments are conducted to identify the model parameters for a precise description of short-term and long-term behaviour of asphalt (material and structure). Initial structural tests allow for an evaluation of the prediction quality of the selected simulation approach for long-term behaviour; this is based on real-time accelerated testing by means of the construction of a scaled ARROWS device. Finally, the attained insight will be inspected with regard to transferability of assumptions to an unscaled, full-sized ARROWS device.

在考虑移动载荷的柔性纸张的机械设计中，特别注意由于拉伸应力而导致的沥青层中疲劳现象的现实描述。如果所得的外部负荷超过沥青的疲劳性抗性，则会发生疲劳裂纹。微裂纹和宏裂纹的倡议高度取决于压力。然而，当前的实验设置表现出应力状态和裂纹传播的机制，这些机制与实际人行道中的那些有很大的不同。数值方法仅限于对基本现象的单个组成部分的复制和描述，或者通常需要进一步发展以允许适用的结果。因此，提出的研究项目采用了数值实验方法，并采用了在移动载荷下沥青层的载荷条件的现实再现。 “加速重复的滚轮负载模拟器”（箭头）的数值和实验开发代表了研究项目的核心，旨在允许对使用寿命以及粘贴结构的疲劳易感性进行准确的知识。重点是实现对裂纹形成和裂纹在包括幅度，加载速度和加载进程在内的裂纹形成和裂纹传播的现实描述。在联合研究项目的初始阶段，数值验证（对固定轮胎液的仿真条件进行了模拟，并且由于开发的箭头测试设备的载荷条件应提供，并且应提供与另一种相比。同时，进行了测试设备的数值概念（设计细节，操作稳定性）。此外，该设备的实验概念将进一步发展。研究项目的重点是实验表征和损伤和愈合现象的数值表示，在移动载荷下人行道中。基于此，应开发一个数值模型，以允许大量的负载周期和长期测试持续时间进行长期预测。进行实验以确定模型参数，以精确描述沥青（材料和结构）的短期和长期行为。初始结构测试允许评估长期行为所选模拟方法的预测质量；这是基于实时加速测试，通过构造缩放箭头设备的构建。最后，将检查附件的洞察力，以将假设转移到未量化的全尺寸箭头设备上。