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Novel Integrated Imaging Approaches for Damage Characterisation of Composite Materials and Structures

用于复合材料和结构损伤表征的新型集成成像方法

基本信息

批准号：
1941831
负责人：
金额：
--
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2017
资助国家：
英国
起止时间：
2017 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1941831
关键词：
Novel Integrated Imaging Approaches Damage

项目摘要

Fibre reinforced polymer (FRP) composite materials are widely used for aero, marine, transportation and energy structure applications. They exhibit high stiffness and strength relative to their weight, and excellent performance when subjected to fatigue loads. A significant drawback is understanding how damage evolves in the materials and the ability to assess if a component should be repaired or continue in service. The outcome is conservative design and unnecessary scrap at the manufacturing stage. Efforts have been made to better assess composite structures using a variety of non-destructive evaluation (NDE) techniques. However the industrially desired 'one stop shop' for inspection has remained elusive. The current industrially preferred technique in the aerospace and wind turbine sectors is ultrasound, and in the shipping sector simple tap tests are often used. The limitation of current techniques (such as ultrasound (UT)) is they cannot provide details on how damage or defects evolve and affect the service life of a component. The PhD project aims at developing an idea known as 'Strain-based NDE'. Here full field imaging techniques are used to capture data that is directly related to the strain caused by the damage to provide prognostic information on the effect of damage. The system will enable decisions to be made on scrap/repair/continue in service. A focus is reducing the cost of such a system by replacing expensive IR detectors with low cost bolometers. A major challenge is the integration of the images collected by white light and infrared imaging. It is well known that composite materials behave differently when they are constructed into a large structure of complex shape and subjected to multi-axial loading. The strain based NDE technique has been demonstrated on simple components so the purpose of this project is to examine actual structural components of complex geometry and characterise the material damage state in-situ.

纤维增强聚合物（FRP）复合材料广泛用于航空、船舶、交通和能源结构应用。它们表现出相对于其重量的高刚度和强度，并且在承受疲劳载荷时具有出色的性能。一个显着的缺点是了解材料的损坏如何演变以及评估组件是否应该修理或继续使用的能力。结果是保守的设计和制造阶段不必要的废料。人们已经努力使用各种无损评估（NDE）技术更好地评估复合材料结构。然而，工业界所期望的“一站式”检查仍然难以实现。当前航空航天和风力涡轮机领域工业上首选的技术是超声波，而在航运领域通常使用简单的敲击测试。当前技术（例如超声波 (UT)）的局限性在于它们无法提供有关损坏或缺陷如何演变以及如何影响组件使用寿命的详细信息。该博士项目旨在开发一种称为“基于应变的濒死体验”的想法。这里使用全场成像技术来捕获与损坏引起的应变直接相关的数据，以提供有关损坏影响的预后信息。该系统将能够就报废/维修/继续服务做出决定。重点是通过用低成本测辐射热计取代昂贵的红外探测器来降低此类系统的成本。一个主要挑战是白光和红外成像收集的图像的集成。众所周知，复合材料在构造成复杂形状的大型结构并承受多轴载荷时表现不同。基于应变的无损检测技术已在简单部件上得到验证，因此该项目的目的是检查复杂几何形状的实际结构部件并表征现场材料损伤状态。