Development and applications of a new non-contact method for mapping of elastic anisotropy using air-coupled plate and surface waves

利用空气耦合板和表面波绘制弹性各向异性的新型非接触方法的开发和应用

• 批准号: 26724186
• 负责人: Professor Dr. Gerhard Busse
• 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: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26724186?language=en
• 关键词: Development; applications; new; non; contact

The majority of current and newly developed materials (polymers, composites, ceramics, nano-structures, etc.) exhibit an evident elastic anisotropy which provides anomalous physical properties and a wide range of applications. Mapping of elastic anisotropy is a sensitive tool for testing material structure and strength, monitoring of product quality and its degradation caused by environmental factors or deviations in manufacturing process, progression of damage, etc. A flexible and reliable engineering technology capable of providing such measurements on-line in industrial environment is not available at present. The project represents an application-oriented fundamental research in the field of aircoupled ultrasound and elastic wave propagation in solids which is aimed at development of a new robust method for depth-resolved mapping and imaging of anisotropy of material stiffness using an efficient conversion of air-coupled ultrasound into plate and surface waves. The method enables automated measurements and imaging of in-plane stiffness anisotropy by remote monitoring of wave propagation characteristics in a wide angular range of directions. As a result of the project, a new engineering methodology is established and tested which is capable for on-line non-contact assessment of reinforcement directions in fibrous materials and multi-ply composites, local anisotropy induced by mechanical stresses, fatigue and damage.

大多数当前和新开发的材料（聚合物、复合材料、陶瓷、纳米结构等）表现出明显的弹性各向异性，这提供了异常的物理性质和广泛的应用。弹性各向异性的映射是一个敏感的工具，用于测试材料的结构和强度，监测产品质量及其退化所造成的环境因素或偏差，在制造过程中，损伤的进展，等灵活和可靠的工程技术，能够提供这样的测量在线在工业环境中是目前不可用的。该项目是一个面向应用的基础研究领域的空气耦合超声波和弹性波传播的固体，其目的是开发一种新的强大的方法，深度分辨映射和成像的各向异性的材料刚度使用空气耦合超声波到板和表面波的有效转换。该方法能够通过远程监测在宽角度范围的方向上的波传播特性来实现面内刚度各向异性的自动测量和成像。作为该项目的结果，一个新的工程方法的建立和测试，这是能够在线非接触评估纤维材料和多层复合材料的增强方向，局部各向异性引起的机械应力，疲劳和损伤。