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首页> 外文会议>International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration >Application of Resonant Ultrasound Spectroscopy Techniques to the Nondestructive Evaluation of Graphite/Epoxy Composites
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Application of Resonant Ultrasound Spectroscopy Techniques to the Nondestructive Evaluation of Graphite/Epoxy Composites

机译：谐振超声波谱技术在石墨/环氧复合材料的非破坏性评价中的应用

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Resonant ultrasound spectroscopy, in various guises, is re-emerging as the method of choice for the determination of elastic moduli. The resonance spectrum of a specimen is dependent on its symmetry, density, geometry, elastic properties, temperature, and the boundary conditions. By using specimens with simple, known, geometry and models including specimen symmetry, resonant ultrasound spectroscopy can determine the full elastic stiffness tensor to great precision with one measurement. With respect to nondestructive evaluation, resonant ultrasound spectroscopy can detect parts per million changes in specimen density, geometry, elastic moduli, temperature, and boundary conditions. For example, resonant ultrasound spectroscopy is being used as a pass/fail test for sphericity of high-precision ceramic ball-bearings. A novel apparatus for driving and detecting the mechanical resonance of objects with major dimensions ranging from millimeters to decimeters is presented. The noise floor of the apparatus is characterized using a high Q titanium alloy and a low Q graphite/epoxy composite. This apparatus is used to generate resonance spectrum of right rectangular parallelepiped specimens of graphite fiber reinforced epoxy composite materials. The sample set consists of 8 types representing four symmetries and two conditions - "perfect" and with defect. Analysis of the resonance spectrum, calculation of theoretical resonance spectrum, and computation of elastic stiffness tensors will be discussed.
机译：在各种顾客中，共振超声波扫描被重新涌现为确定弹性模量的选择方法。样本的共振光谱取决于其对称性，密度，几何形状，弹性性质，温度和边界条件。通过使用具有简单，已知的几何和模型的样本，包括样本对称的模型，共振超声波光谱可以通过一次测量来确定完全弹性刚度张量的精度。相对于非破坏性评价，谐振超声光谱学可检测每百万份的变化在试样密度，几何形状，弹性模量，温度，和边界条件。例如，谐振超声波光谱被用作高精度陶瓷球轴承的球形度的通过/故障测试。提出了一种用于驱动和检测物体机械谐振的新颖装置，其具有从毫米到排列的主要尺寸。该装置的噪声地板的特征在于使用高Q钛合金和低Q石墨/环氧复合材料。该装置用于产生石墨纤维增强环氧复合材料的右长方体标本的谐振谱。样本集由8种类型表示四种对称性和两个条件 - “完美”和缺陷。讨论分析谐振谱，理论谐振谱的计算和弹性刚度张量的计算。

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