Characterization and modelling of the behaviour of advanced woven composite material

先进编织复合材料行为的表征和建模

• 批准号: RGPIN-2018-05537
• 负责人: Dano, MarieLaure
• 金额: $ 1.97万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681785
• 关键词: Characterization; modelling; behaviour; advanced; woven

The current aerospace industry seeks and asks for new innovative materials to be used for primary aircraft components. Because of their structural performance and light weight, composite materials are now increasingly being used in primary aircraft structures. However, conventional laminated composites only have in-plane oriented fibers making them vulnerable to delamination against impact loads. Therefore, interest for using three-dimensional (3-D) woven composites for aircraft applications is rising. Indeed 3-D woven composites offer higher delamination resistance and damage tolerance because of yarns woven in the through-thickness-direction. However, to support their growing use and applications, a better knowledge of their mechanical properties and behaviour until rupture is required. ******The applicant's research group has recently begun conducting experimental and numerical studies on the mechanical behavior of a 3D interlock woven composite subjected to impact loading. A preliminary model based on a continuum damage mechanics (CDM) approach has been proposed. It uses three damage variables (in the weft, warp and in-plane shear directions) and take into account inelastic strains in the weft and in-plane shear directions. However, the model currently doesn't take into account coupling between the different damage variables and between the inelastic strains. The main objectives of the research proposal are therefore to improve the constitutive laws and develop reliable and robust numerical tools to predict the mechanical behaviour of 3D woven composites.******Laboratory experiments will be conducted to determine coupling effects. Improved damage evolution laws will be proposed as well as a new plasticity development law. Additional impact tests will be performed at different energy levels to validate the model. Next, a realistic representative unit cell will be modelled. A progressive damage will be implemented and the finite-element software Abaqus will be used to test virtually the 3D composite and predict its mechanical behaviour. The results of the virtual tests will allow determining theoretically the parameters and variables used in the constitutive equations, plasticity and damage laws of the macroscopic CDM model. Finally, fatigue tests will be conducted to gain a better understanding of fatigue induced damage and failure modes. ***The developed numerical tools will allow simulating the structure behavior as a function of the 3D-woven architecture used for the composite reinforcement. The simulations will allow to reduce design cycle and minimize the number of components to be tested. The research results will have the potential to lead to numerous applications in the automotive and aeronautical areas. ********

当前的航空航天工业寻求并要求新的创新材料用于飞机的主要部件。复合材料因其结构性能好、重量轻等优点，越来越多地被用于飞机的主要结构中。然而，传统的层合复合材料只有面内取向的纤维，这使得它们在冲击载荷下容易发生分层。因此，将三维(3-D)机织复合材料用于飞机应用的兴趣正在上升。事实上，由于纱线沿厚度方向编织，3-D机织复合材料提供了更高的抗分层和损伤容限。然而，为了支持它们日益增长的使用和应用，需要更好地了解它们的机械性能和行为，直到需要断裂为止。*申请人的研究小组最近开始对3D联锁编织复合材料在冲击载荷下的力学行为进行实验和数值研究。提出了一个基于连续介质损伤力学(CDM)方法的初步模型。它使用三个损伤变量(纬向、经向和面内剪切方向)，并考虑了纬向和面内剪切方向的非弹性应变。然而，目前的模型没有考虑不同损伤变量之间的耦合以及非弹性应变之间的耦合。因此，研究建议的主要目标是改进本构关系，开发可靠和健壮的数值工具来预测3D机织复合材料的力学行为。*将进行实验室实验以确定耦合效应。提出了改进的损伤演化规律和新的塑性发展规律。将在不同的能级上进行额外的冲击试验，以验证模型的有效性。接下来，将对一个真实的代表性单元格进行建模。将实施渐进损伤，并将使用有限元软件ABAQUS来虚拟测试3D复合材料并预测其力学行为。虚拟试验的结果将为从理论上确定宏观CDM模型的本构方程、塑性和损伤规律中使用的参数和变量提供依据。最后，将进行疲劳试验，以更好地了解疲劳引起的损伤和失效模式。*开发的数值工具将允许模拟结构行为作为用于复合材料加固的3D编织结构的函数。模拟将允许缩短设计周期并最大限度地减少待测试组件的数量。这些研究成果将有可能在汽车和航空领域产生大量应用。********