Micromechanical damage detection in fibre reinforced materials using ultrasonic birefringence

使用超声波双折射检测纤维增强材料的微机械损伤

• 批准号: 393107521
• 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: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/393107521?language=en
• 关键词: Micromechanical; damage; detection; fibre; reinforced

In this project we intend to develop the ultrasonic birefringence method as a nondestructive testing method to detect damage and chances in the material structure of fiber reinforced materials. For this purpose we damage CFRP materials with a systematic damage degree to generate debonding of fibers and matrix, macroscopic delaminations and the generation of micro cracks. We detect this different types of damage by using ultrasonic birefringence. By using a new developed model for the birefringence effect we can calculate from the ultrasonic results the elastic constants G13 and G23. This findings is then transferred to a micromechanical simulation, to model the part behavior under different load profiles. In doing so we can correlate the influence of the micro cracks on the elastic constants and the corresponding mechanical properties of the CFRP reference samples. To solve the kind of inverse problem, we first have to solve the straight forward problem by using both standard FEM packages and new developed model of the birefringence. Here the reflection and scattering effects in different layers of the ply has to be taken into consideration. The objective of the project is the development of a new testing method to ensure a fast decision whether a component can be further operated or must be replaced within a certain time period.

在本计画中，我们打算发展超音波双折射法作为一种非破坏性检测方法，以侦测纤维强化材料结构中的损伤与机会。为此，我们破坏CFRP材料与系统的损伤程度，产生纤维和基体的脱粘，宏观分层和微裂纹的产生。我们通过使用超声双折射来检测这种不同类型的损伤。通过使用新开发的双折射效应模型，我们可以从超声结果计算弹性常数G13和G23。然后将这一发现转移到微观力学模拟中，以模拟不同载荷分布下的零件行为。在这样做时，我们可以关联的弹性常数和相应的CFRP参考样品的力学性能的微裂纹的影响。为了解决这类反问题，我们首先必须使用标准的有限元软件包和新开发的双折射模型来解决正问题。这里，必须考虑层片的不同层中的反射和散射效应。该项目的目标是开发一种新的测试方法，以确保快速决定组件是否可以进一步操作或必须在一定时间内更换。