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A synchronous thermal-mechanical in-situ device for dynamic fracture initiation

基于在位力热同步实验装置的动态断裂起裂机理研究

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Abstract

As a typical failure behavior, the dynamic fracture is critical for material safety assessment and design, whose rapid evolution in the crack tip over a short time causes tremendous challenges in characterizing the evolution of the local temperature field. Although researchers have pointed out that temperature significantly affects fracture toughness, the temperature rise and the role of thermal softening in the crack tip region during the dynamic crack initiation need to be clarified. This work aims to evaluate the temperature rise effect at crack initiation in TC4 (Ti-6Al-4V) alloy under impact loading. We developed a thermal-mechanical coupled in-situ measurement system to obtain synchronized COD (crack-tip opening displacement) and temperature field evolution for the dynamic mode I fracture with high temporal and spatial resolution. The evolution of synchronous COD and temperature field during crack initiation under dynamic loading was investigated. The corresponding simulation was conducted to analyze the thermal softening effect at dynamic crack initiation. In TC4 alloy, the maximum temperature detected at crack initiation is about 130 °C, and the thermal effect on the material property is minor. The results of this work fulfill data support for investigating the coupled thermal-mechanical fracture behavior of metal.

摘要

作为一种典型的失效行为, 动态断裂对于材料安全评估和设计至关重要, 而动态断裂的瞬时性给实验表征裂纹尖端局部温度场演化带来了巨大挑战. 研究人员指出温度对断裂韧性有显著影响, 但在动态断裂起裂过程中, 温度升高和裂纹尖端区域热软化效应的作用仍需阐明. 本工作旨在评估温升效应对TC4 (Ti-6Al-4V)合金受冲击动态断裂起裂的影响. 我们开发了一种力/热耦合在位测试装置, 获得了高时间/空间分辨率的动态I型断裂的同步COD(裂纹尖端张开位移)和温度场演化过程, 并进行了相应的模拟, 分析了动态断裂起裂时的热软化效应的作用. 对于TC4合金, 起裂时刻测得的最高温度约为130, 热效应对材料性能的影响较小. 本工作的结果为研究金属的力/热耦合断裂行为提供了数据支持.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11922202, 12002050, and 12102044), the National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact (Grant No. 6142902200401), Beijing Institute of Technology Research Fund Program for Young Scholars and the Fundamental Research Funds for the Central Universities (Grant No. 2022JCCXLJ01).

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Authors and Affiliations

  1. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Wei Liu  (刘伟) & Longkang Li  (李隆康)

  2. Institute of Advanced Structure Technology, Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing, 100081, China

    Heng Yang  (杨恒), Manxi Chen  (陈满喜), Kai Yi  (伊凯), Wei Qi  (齐伟), Shengxin Zhu  (朱盛鑫), Qinglei Zeng  (曾庆磊) & Hao-Sen Chen  (陈浩森)

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  1. Wei Liu  (刘伟)
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  2. Longkang Li  (李隆康)
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  3. Heng Yang  (杨恒)
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  5. Kai Yi  (伊凯)
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  6. Wei Qi  (齐伟)
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  7. Shengxin Zhu  (朱盛鑫)
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  8. Qinglei Zeng  (曾庆磊)
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  9. Hao-Sen Chen  (陈浩森)
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Contributions

Wei Liu: Conceptualization, Methodology and Supervision. Longkang Li: Investigation, Formal analysis, Writing–original draft and Writing–review & editing. Heng Yang: Supervision, Validation, Writing–original draft and Writing–review & editing. Manxi Chen: Validation and Writing–review & editing. Kai Yi: Writing–review & editing. Wei Qi: Investigation and Methodology. Shengxin Zhu: Conceptualization and Supervision. Qinglei Zeng: Conceptualization, Software and Supervision. Hao-Sen Chen: Conceptualization, Funding acquisition, Project administration, Resources and Supervision.

Corresponding authors

Correspondence to Heng Yang  (杨恒) or Hao-Sen Chen  (陈浩森).

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Liu, W., Li, L., Yang, H. et al. A synchronous thermal-mechanical in-situ device for dynamic fracture initiation. Acta Mech. Sin. 39, 122492 (2023). https://doi.org/10.1007/s10409-023-22492-x

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