Concrete Microcracks Detection under Compressive Load Based on Nonlinear Ultrasonics Modulation with Broadband Excitation

IF 1.3 4区材料科学 Q3 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Research in Nondestructive Evaluation Pub Date : 2022-03-04 DOI:10.1080/09349847.2022.2089793

Qingyuan Wang, Ying Xu, Chengyin Liu

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Abstract

ABSTRACT The initiation and propagation of microcrack damage in concrete under compressive load have a great influence on structures that require high durability. This paper theoretically analyzed the nonlinear acoustic modulation mechanism in concrete at the initial stage of compressive cracking and explored the relationship between microcrack density and nonlinear response variation. Nonlinear behavior and microcrack development of concrete were simulated. 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 in microcrack density measured by the DI (damage index) of the nonlinear acoustic field technology was much more significant than that measured by DIC (digital image correlation). The experimental results showed the good feasibility of microcrack detection with width of 13–80 μm. Moreover, the experiment found that when the peak value of DI is between 0.02 and 0.2, microcracks occur in concrete.

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基于宽带激励非线性超声调制的压缩荷载下混凝土微裂缝检测

受压荷载作用下混凝土微裂纹损伤的萌生和扩展对耐久性要求较高的结构具有重要影响。本文从理论上分析了混凝土压缩开裂初期的非线性声调制机制，探讨了微裂缝密度与非线性响应变化的关系。模拟了混凝土的非线性行为和微裂纹的发展。研究了不同裂纹状态下微裂纹的开闭状态及非线性声调制信号的传播特性。研究发现，非线性声场技术中损伤指数(DI)测量的微裂纹密度变化比数字图像相关(DIC)测量的微裂纹密度变化要显著得多。实验结果表明，在13 ~ 80 μm范围内检测微裂纹具有良好的可行性。实验发现，当DI峰值在0.02 ~ 0.2之间时，混凝土中出现微裂缝。

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来源期刊

Research in Nondestructive Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Research in Nondestructive Evaluation® is the archival research journal of the American Society for Nondestructive Testing, Inc. RNDE® contains the results of original research in all areas of nondestructive evaluation (NDE). The journal covers experimental and theoretical investigations dealing with the scientific and engineering bases of NDE, its measurement and methodology, and a wide range of applications to materials and structures that relate to the entire life cycle, from manufacture to use and retirement. Illustrative topics include advances in the underlying science of acoustic, thermal, electrical, magnetic, optical and ionizing radiation techniques and their applications to NDE problems. These problems include the nondestructive characterization of a wide variety of material properties and their degradation in service, nonintrusive sensors for monitoring manufacturing and materials processes, new techniques and combinations of techniques for detecting and characterizing hidden discontinuities and distributed damage in materials, standardization concepts and quantitative approaches for advanced NDE techniques, and long-term continuous monitoring of structures and assemblies. Of particular interest is research which elucidates how to evaluate the effects of imperfect material condition, as quantified by nondestructive measurement, on the functional performance.