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New highly-sensitive and non-contact methods for acoustic recognition and imaging of defects in composites

用于复合材料缺陷声学识别和成像的新型高灵敏非接触方法

基本信息

批准号：
389769996
负责人：
Professor Dr. Marc Daniel Leonhard von Kreutzbruck
金额：
--
依托单位：
Institut für Kunststofftechnik (IKT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/389769996?language=en
关键词：
New highly sensitive non contact

项目摘要

The requirements and standards of quality assurance for materials and industrial components continue to be upgraded constantly to meet the ever-growing demands for reliability and safety in modern engineering systems.The project is aimed at enhancing efficiency and sensitivity of acoustic NDT techniques by using the concept of a local resonance of defects. The novelty of the proposed approach is that it provides a selective acoustic excitation and energy delivery from the wave directly to the defect via its mechanical resonance. By frequency match between a probing ultrasonic wave and the defect resonance, a substantial enhancement in efficiency and sensitivity of ultrasonic NDT techniques is validated. A significant improvement is expected for the family of prospective ultrasound-activated effects (nonlinear, thermal, etc.) which are usually comparatively inefficient so that the corresponding NDT and imaging techniques require an elevated acoustic power and specific instrumentation adapted to high-power ultrasonics. The project is concerned with development of the resonance and non-contact versions for the techniques of nonlinear ultrasonics and ultrasonic thermography (thermosonics) with advanced efficiency that enables to avoid high-power apparatuses and use conventional low-energy NDT equipment instead.To this end, a detailed theoretical analysis and numerical modelling of the local resonance-induced phenomena will be given for basic types of defects in composite materials. The simulation will include both linear and nonlinear resonant modes of defects to be applied for a comprehensive vibration spectrum analysis, the models of frictional heating to address a resonant acousto-thermal conversion.The experimental methodologies to be used for recognition of the defect resonance combine an acoustic (both contact and non/contact) excitation with monitoring a local vibration pattern and a defect thermal response by means of scanning laser vibrometry and IR-camera. A resonance amplification of defect vibrations results in a strong nonlinear defect response and a local spectral conversion. The nonlinear resonance modes to be studied and applied for a highly-sensitive defect recognition and imaging will include sub- and super-harmonic parametric resonances. The advantages of resonance ultrasonic thermography with an enhanced thermal response of defects will be elaborated and experimentally analysed for both linear and nonlinear vibration modes. A special emphasis will be given to investigation of non-contact resonance techniques with objective to create the methods which combine benefits of resonant approach with simplicity of conventional ultrasonic probing.The implementation of the project will result in substantial improvement of acoustic technologies for NDT and imaging of flaws in composite materials relevant to automotive, aviation and aerospace industries.

材料和工业部件的质量保证要求和标准不断升级，以满足现代工程系统对可靠性和安全性日益增长的需求。该项目旨在通过使用缺陷局部共振的概念来提高声学无损检测技术的效率和灵敏度。所提出的方法的新奇在于，它提供了一个选择性的声激励和能量传递从波直接通过其机械共振的缺陷。通过探测超声波与缺陷共振频率的匹配，验证了超声无损检测技术的效率和灵敏度的显著提高。预期超声激活效应（非线性、热效应等）系列将有显著改善。其通常相对低效，使得相应的NDT和成像技术需要提高的声功率和适于高功率超声的特定仪器。该项目涉及非线性超声和超声热成像（热超声）技术的共振和非接触版本的开发，其具有先进的效率，能够避免高功率设备，而使用传统的低能无损检测设备。为此，将针对复合材料中的基本类型的缺陷，对局部共振诱导现象进行详细的理论分析和数值模拟。模拟将包括缺陷的线性和非线性共振模式，以应用于全面的振动频谱分析，用于识别缺陷共振的实验方法学结合了联合收割机的声学方法学，（接触和非/接触）激励，通过扫描激光测振仪和红外摄像机监测局部振动模式和缺陷热响应。缺陷振动的共振放大导致强烈的非线性缺陷响应和局部光谱转换。待研究并应用于高灵敏度缺陷识别和成像的非线性共振模式将包括次谐波和超谐波参数共振。共振超声热成像的优点与增强的热响应的缺陷将阐述和实验分析的线性和非线性振动模式。特别强调非接触共振技术的研究，目的是创造一种方法，结合联合收割机的优点与传统的超声波探测的简单性。该项目的实施将导致显着改善声学技术的无损检测和成像缺陷的复合材料相关的汽车，航空和航天工业。