Fatigue damage accumulation and failure of high temperature polymeric composite materials

高温高分子复合材料的疲劳损伤累积与失效

• 批准号: 203497-2010
• 负责人: Fawaz, Zouheir
• 金额: $ 2.04万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=546351
• 关键词: Fatigue; damage; accumulation; failure; temperature

The central objective of the proposed research is to investigate the fatigue failure of new generations of high temperature polymer matrix composites utilized at or near their maximum design temperatures and propose generalized mathematical and numerical models to predict damage accumulation and ultimate failure under this loading environment. To meet this objective, a continuum damage mechanics fatigue model will be developed, with statistical considerations and provisions for nonlinear viscoelastic constitutive equations to account for the elevated temperature environment. This fatigue model, simulating failure based on material property degradation, will be implemented into a finite element solution, to facilitate the fatigue failure analysis of practical structures made of polymer matrix composites . The material property degradation will be modeled via a micromechanically-based damage tensor that will be developed as part of the overall modeling approach and will consider the various damage mechanisms, such as matrix cracking, delamination, fiber-matrix debonding and fiber fracture, and their influence on the material properties. Experimental characterization of the high temperature composite will be carried out under static and fatigue loading conditions at high temperature followed by validation of the proposed failure model through testing of unidirectional, angle-plied, cross-plied, and quasi-isotropic laminates made from a new generation of high temperature polymeric matrix materials reinforced with continuous unidirectional carbon fibers. Test results will also be obtained on two other high temperature polymer composites to obtain comparative data. The long term objectives of the proposed research include paving the way for the fatigue failure modeling of other forms of high temperature polymer matrix composites such as those reinforced with woven or braided fibers.

该研究的中心目标是研究新一代高温聚合物基复合材料在其最高设计温度或接近其最高设计温度时的疲劳破坏，并提出广义的数学和数值模型来预测这种载荷环境下的损伤累积和最终破坏。为了实现这一目标，将开发一个连续损伤力学疲劳模型，并考虑到高温环境的统计考虑和非线性粘弹性本构方程的规定。该疲劳模型将模拟基于材料性能退化的失效，并将其实现为有限元解，以便于对聚合物基复合材料制成的实际结构进行疲劳失效分析。材料性能退化将通过基于微力学的损伤张量进行建模，该张量将作为整体建模方法的一部分开发，并将考虑各种损伤机制，如基体开裂、分层、纤维-基体脱粘和纤维断裂，以及它们对材料性能的影响。高温复合材料的实验表征将在高温静态和疲劳载荷条件下进行，然后通过测试由新一代高温聚合物基体材料制成的单向、角层合、交叉层合和准各向同性层合板来验证所提出的失效模型，这些材料由连续单向碳纤维增强。还将获得另外两种高温聚合物复合材料的测试结果，以获得比较数据。这项研究的长期目标包括为其他形式的高温聚合物基复合材料的疲劳失效建模铺平道路，例如那些用编织或编织纤维增强的材料。