混凝土轴压荷载微裂缝宽频非线性声场激励检测

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (18) : 184-191.

论文

王青原1,2，许颖1,2，樊悦1,2，徐婷婷1,2

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The detection of concrete microcracks under compressive loading based on nonlinear ultrasonics modulation with broadband excitation

WANG Qingyuan1,2,XU Ying1,2,FAN Yue1,2,XU Tingting1,2

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摘要

受压荷载作用下混凝土微裂缝损伤的产生和发展对于特殊混凝土结构具有较大影响。本文从理论上分析了混凝土材料受压开裂初期固体内产生非线性调制现象的原理，关联混凝土材料微裂缝密度与非线性声场调制作用下的非线性响应改变量。有限元模拟了混凝土材料的细观非线性及微裂缝开展，探究非线性声场调制作用下不同开裂状态微裂缝处的开合状态及非线性调制超声信号的传播特性。发现当压缩应力小于5%极限压缩应力范围内时，非线性声场技术的边代峰计数损伤指标变化远比数字图像法测得的微裂缝密度改变明显，对微裂缝的表征具有优势。通过实验研究发现本方法对宽度为80微米及以下的微裂缝产生和扩展具有较好的可测性，当损伤指标峰值计算结果为(0.02，0.2)区间时，混凝土材料产生微裂缝。在混凝土稳定损伤阶段，本研究给出了损伤指标峰值与裂缝密度的线性回归数值关系。
关键词：混凝土微裂缝；非线性声场调制技术；微裂缝密度；边代峰计数法；损伤指标

Abstract

The initiation and propagation of microcrack damage in concrete under compression load have a great influence on structures that require a high level of concrete durability. This paper theoretically analyzed the nonlinear acoustic modulation mechanism in concrete at the initial stage of compression cracking and explored the relationship between microcrack density of concrete and nonlinear response variation. Nonlinear behavior and microcrack development of concrete were simulated by finite element method. The opening /closing state of microcracks under different cracking states and the propagation characteristics of nonlinear acoustic modulated signals were investigated. It was found that the change of the DI (damage index) of the SPC (side peak count) difference of the nonlinear acoustic field technology was much more significant than that of the microcrack density measured by DIC method. The experimental results showed the good feasibility of microcracks detection with width of 30-80μm. Moreover, the experiment found that when the peak value of DI is from 0.02 to 0.2, microcrack occurs in concrete. The linear regression numerical relationship between the peak value of DI and microcrack density is given in the stable-damage stage of concrete.
Key words: concrete microcracks; nonlinear acoustic modulation technique; microcrack density; sideband peak count; damage index.

导出引用

王青原1,2，许颖1,2，樊悦1,2，徐婷婷1,2. 混凝土轴压荷载微裂缝宽频非线性声场激励检测[J]. 振动与冲击, 2022, 41(18): 184-191

WANG Qingyuan1,2,XU Ying1,2,FAN Yue1,2,XU Tingting1,2. The detection of concrete microcracks under compressive loading based on nonlinear ultrasonics modulation with broadband excitation[J]. Journal of Vibration and Shock, 2022, 41(18): 184-191

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