混凝土裂纹扩展的非线性超声表征试验研究
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TU528.1

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国家重点研发计划资助(项目编号:2021YFB2600500); 中央科研院所科研创新基金(TKS190105)第一作者: 聂智超(1993-),男,汉族,四川绵阳人,博士,助理研究员。研究方向: 港工建筑物健康诊断。E-mail: niezhc@tiwte.ac.cn。*通信作者: 刘现鹏(1977-),男,汉族,河北邢台人,硕士,高级工程师。研究方向: 港工建筑物健康诊断。E-mail: tiankesuo@163.com。 *


Experimental Study on Nonlinear Ultrasonic Characterization of Concrete during Crack Propagation
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    摘要:

    混凝土内分布大量微孔隙、微裂纹等软性夹杂,精确探测微裂纹的萌生与扩展对其安全与健康评价具有极为重要的意义。二次谐波法对混凝土微损伤较为敏感,然而,对于裂纹扩展过程中的非线性超声响应规律的研究较少,且混凝土材料的非线性超声研究样本尚显不足。为此,本文首先利用扫描电子显微镜(SEM)观察未加载试样的微观形貌,验证了混凝土试样的完整性,进而设计了应力、应变和非线性参数的同步测试系统,探究了受压过程中的混凝土非线性参数β变化规律。研究结果表明,加载初期非线性参数β显著增加,随着荷载水平的增加,非线性参数β迅速下降,并在后续加载过程中波动变化。结合单轴受压混凝土的裂纹扩展规律,讨论了裂纹扩展对非线性参数β的影响规律,并与首波幅值A进行了对比,得到了非线性超声参数对混凝土微损伤的萌生及扩展更为敏感,而首波幅值A对混凝土弹性阶段后期和塑性阶段损伤规律性更强的结论。

    Abstract:

    Plenty of soft inclusions such as micro pores and micro cracks are commonly distributed in concrete. Figuring out the generation and propagation of micro cracks in concrete is of great significance to the detection and evaluation of initial damage in concrete. Second harmonic generation method is more sensitive to the micro damage in concrete. However, the study of the regularity of nonlinear ultrasonic during crack propagation is rare and insufficient. Therefore, the integrity of concrete specimens was first verified by observing the microscopic morphology of the samples using scanning electron microscopy (SEM). Then a simultaneous test system for stress, strain and nonlinear parameters was designed to investigate the regularity of the nonlinear parameter β during the compressive loading. The results show that the nonlinear parameter β increases significantly at the beginning of loading. With the increase of the compressive load, the nonlinear parameter β decreases rapidly, and fluctuates during the subsequent loading. Compared with the first wave amplitude A, it is proved that the nonlinear ultrasonic parameter β is more sensitive to the initiation and accumulation of the micro damage in concrete, and the first wave amplitude A has a better regularity to the later elastic stage and the plastic stage in concrete.

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聂智超,连磊,李绍令,等. 混凝土裂纹扩展的非线性超声表征试验研究[J]. 科学技术与工程, 2022, 22(28): 12564-12570.
Nie Zhichao, Lian Lei, Li Shaoling, et al. Experimental Study on Nonlinear Ultrasonic Characterization of Concrete during Crack Propagation[J]. Science Technology and Engineering,2022,22(28):12564-12570.

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  • 收稿日期:2022-01-29
  • 最后修改日期:2022-07-06
  • 录用日期:2022-05-16
  • 在线发布日期: 2022-10-26
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