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Influence of delamination on fatigue properties of a fibreglass composite

机译：分层对玻璃纤维复合材料疲劳性能的影响

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摘要

Residual fatigue life, stiffness and strength are directly related to presence of defects and damages in composite materials, among which delamination is one of the most diffused. This work aims to study the effect of delamination on fatigue behaviour of a glass fibre reinforced composite. Experimental tests are carried out to check fatigue life decrease of delaminated specimens, with a Teflon layer at half of its thickness, by a comparison with undamaged material. In order to evaluate defects presence and their progressive evolution, infrared thermography is taken into account, monitoring surface temperature of the damaged and undamaged samples. Static and fatigue tests are carried out, and a high cycle fatigue limit is identified for this composite material. Three approaches, based on thermal observations of static and dynamic tests at increased stress amplitude, revealed a relation between thermal response of the material and the fatigue limit. From this standpoint, thermography can be indicated as a valid tool to monitor damage initiation and its evolution during testing, and to estimate fatigue life.
机译：残余疲劳寿命，刚度和强度与复合材料中缺陷和损坏的存在直接相关，其中分层是最分散的分层之一。这项工作旨在研究分层对玻璃纤维增​​强复合材料疲劳行为的影响。通过与未损坏的材料进行比较，进行了实验测试，以检查分层样品的疲劳寿命降低，其中特氟龙层的厚度为厚度的一半。为了评估缺陷的存在及其逐步发展，考虑了红外热成像技术，以监测损坏和未损坏样品的表面温度。进行了静态和疲劳测试，并确定了该复合材料的高循环疲劳极限。三种方法基于在应力幅值增加时对静态和动态测试的热观察，揭示了材料的热响应与疲劳极限之间的关系。从这个角度来看，热成像可以被视为一种有效的工具，可以在测试过程中监控损伤的发生及其演变，并评估疲劳寿命。

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