Nonlinear Acoustic Measurements for NDE Applications: Waves Versus Vibrations

Nonlinear Acoustic Measurements for NDE Applications: Waves Versus Vibrations
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NDE 应用的非线性声学测量:波与振动

DOI:
10.1007/978-981-15-1461-6_4
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
I. Solodov
I. Solodov
中科院分区:
--
文献类型:
--
作者:
I. Solodov

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在工业和技术中广泛使用的大多数声学仪器都是利用材料的线弹性响应进行无损检测。超声无损检测的非线性方法与材料的非线性响应有关,与输入信号的频率变化密切相关,是一种用于材料性能劣化监测和损伤诊断的新技术。目前的应用领域既包括非线性波动模式,也包括非线性振动模式。前者是基于假设的,适用于分布材料非线性的实例研究。它得益于波的非线性响应沿传播距离的积累,并依赖于更高的谐波信号。平面缺陷中非粘结界面的强烈非线性响应引入了局域化的非线性,在缺陷区域振动非线性增强。局部缺陷共振(LDR)及其非线性的概念将非线性夹杂识别为一种非线性振子,并在振动非线性现象中产生不同的动态和频率情景。LDR诱导的非线性陷阱产生了缺陷选择性的非线性,并为有效甚至非接触的损伤非线性诊断成像创造了条件。
Majority of acoustic instruments widely used in industry and technology for non-destructive evaluation (NDE) make use of a linear elastic response of materials. The nonlinear approach to ultrasonic NDE is concerned with nonlinear material response, which is inherently related to the frequency changes of the input signal, and is a new technology for monitoring of deterioration in material properties and diagnostics of damage. The application field now includes both the nonlinear wave and nonlinear vibration modes. The former is based on the assumption and is applicable to the case studies of the distributed material nonlinearity. It profits from accumulation of the wave nonlinear response along the propagation distance and relies on the higher harmonic signals. A strong nonlinear response of non-bonded interfaces in planar defects introduces the nonlinearity localized in the defect area where the vibration nonlinearity steps up. The concept of local defect resonance (LDR) combined with its nonlinearity identifies a nonlinear inclusion as a nonlinear oscillator and brings about different dynamic and frequency scenarios in vibration nonlinear phenomena. The LDR-induced trapping of the nonlinearity generates a defect-selective nonlinearity and conditions for efficient and even noncontact nonlinear diagnostic imaging of damage.
DOI: --
发表时间: 1980
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