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Simulating damage and permanent strain in composites under in-plane fatigue loading

机译:模拟面内疲劳载荷下复合材料的损伤和永久应变

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Fibre-reinforced composites are used in many fatigue-critical applications (wind turbine blades, aircraft components, leaf springs, ...). Due to their heterogeneous and anisotropic nature, their fatigue behaviour is rather complex and several damage mechanisms can develop during fatigue life. This paper presents a damage mechanics-based fatigue model for fibre-reinforced plastics, where both stiffness degradation and (possible) accumulation of permanent strain are simulated from the first loading cycle up till final failure. The model has been validated for cantilever bending fatigue tests of plain woven glass/epoxy composite. Although the damage growth rate varies along the specimen length, the finite element simulations with the damage model are able to account for decreasing (bending) stiffness and permanent strain.
机译:纤维增强的复合材料用于许多对疲劳至关重要的应用中(风力涡轮机叶片,飞机部件,板簧等)。由于它们的异质性和各向异性,它们的疲劳行为相当复杂,并且在疲劳寿命过程中会发展出多种损伤机理。本文提出了一种基于损伤力学的纤维增强塑料疲劳模型,其中从第一个加载周期一直到最终破坏,都模拟了刚度下降和(可能)永久应变的积累。该模型已针对平纹玻璃/环氧树脂复合材料的悬臂弯曲疲劳测试进行了验证。尽管损伤增长率沿试样长度变化,但是使用损伤模型进行的有限元模拟能够解决刚度减小(弯曲)和永久应变的问题。

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