Influence of matrix properties on fatigue behavior of fiber reinforced polymers

基体性能对纤维增强聚合物疲劳行为的影响

• 批准号: 468045930
• 负责人: Professor Dr.-Ing. Joachim Hausmann
• 金额: --
• 依托单位: Leibniz-Institut für Verbundwerkstoffe (IVW)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/468045930?language=en
• 关键词: Influence; matrix; properties; fatigue; behavior

Fiber reinforced composite materials with thermoplastic matrix are used increasingly in many transport applications. Thermoplastic matrix materials offer higher ductility and toughness compared to common thermoset systems. These superior properties lead to the question of the influence of the composite constituents on the fatigue properties of a laminate. The matrix properties are influencing the load cycles until failure as well as the deformation behavior at a certain life time. Established thermoset matrix material reveal on laminate or lamina level experimentally parameterized failure models. An associated damage model reveals the cycles until failure and the deformation behavior over the life time. Anisotropy along with microscopic inhomogeneity due to fiber and matrix lead to strong dependency of the fatigue behavior of continuous fiber reinforced polymers to mean stress and load direction. By this scheme experimentally determined description reveals the global response of the material system on external loads and their direction and sequence. Problem is that the precision of prediction is determined by experimental effort and each change of constituent properties requires new experimental characterization. The behavior of matrix, fibers and fiber-matrix interface on microscopic level is responsible for the global response of the composite material. New fiber-matrix combinations and thus new properties regarding fatigue behavior require profound understanding of the influence of the constituents. Aim of the project is therefore generation of basic and systematic understanding and description of the interaction of mechanical matrix properties and the fatigue behavior of fiber-polymer composites on microscopic level. By irradiation induced crosslinking the properties of the matrix material are modified systematically and their influence on the fatigue properties of the composite material is investigated experimentally and with the aid of models. Exemplary material systems will be used which allow separation of influencing factors.

带有热塑性基质的纤维增强复合材料在许多运输应用中越来越多地使用。与常见的热固性系统相比，热塑性矩阵材料具有更高的延展性和韧性。这些上等特性导致了复合成分对层压板疲劳特性的影响的问题。矩阵特性会影响负载周期，直到失败以及在一定寿命的变形行为为止。建立的热固性基质材料在层压板或层状水平上揭示了实验参数化的故障模型。相关的损害模型揭示了循环，直到失败和生命中的变形行为为止。各向异性以及由于纤维和基质引起的微观不均匀性，导致连续纤维增强聚合物的疲劳行为的强烈依赖性，即表示应力和负载方向。通过该方案，实验确定的描述揭示了材料系统对外部载荷及其方向和顺序的全局响应。问题是预测的精度是由实验努力确定的，并且各个成分特性的每种变化都需要新的实验表征。微观水平上基质，纤维和纤维 - 矩阵界面的行为是复合材料的全局响应。新的纤维 - 矩阵组合以及疲劳行为的新特性需要深入了解成分的影响。因此，该项目的目的是生成基本和系统的理解和描述机械基质特性的相互作用以及在微观水平上纤维聚合物复合材料的疲劳行为。通过辐照诱导的交联，对基质材料的特性进行了系统的修改，并借助模型研究了它们对复合材料疲劳性能的影响。将使用示例性的材料系统，以分离影响因素。