Simple analytical modeling of residual flexural properties of hybrid PEEK thermoplastic composite laminate under kerosene flame exposure

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-09-13 DOI:10.1016/j.compstruct.2025.119648

Lanhui Lin , Benoit Vieille , Christophe Bouvet , Tanguy Davin

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引用次数: 0

Abstract

The present work aims to propose a simple two-layer analytical model to determine the residual bending properties of hybrid carbon/glass fibers reinforced PEEK (CG/PEEK) laminates under localized kerosene flame exposure (1100 °C and 116 kW/m² by a burner bench). It is intended to better understand the relationship between thermally-induced damages and the residual bending properties and also to predict the changes of the flexural properties as a function of flame exposure time. On the one hand, the influence of porosity induced by isothermal heating conditions (temperature ranging from the melting one to the point of resin decomposition) on post-heat flexural properties is examined, which allows the effects of different phase transitions of the PEEK matrix to be dissociated. The residual flexural strength and stiffness of thermally degraded laminates decrease rapidly with the increasing amount of porosity as function of exposure temperature and heating time (400 – 450 – 500 – 525 – 550℃ for 300 – 600 – 900 s). These isothermal tests allow master curves to be formulated that show the correlations between porosity ratio and residual flexural properties. These master curves, combined with through-thickness observations, are expected to provide a comprehensive interpretation of the post-fire flexural behavior of different layers. On the other hand, by means of a two-layer (char layer and decomposition layer) model considering different distances from the flame, it is possible to determine the residual bending properties of post-fire CG/PEEK laminates as a function of the flame exposure times. The proposed analytical model shows a good agreement with the experimental results (obtained in the preliminary study), and the important role of the char layer and its residual properties under long-time flame exposures are highlighted.

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煤油火焰下混杂PEEK热塑性复合材料层合板残余弯曲性能的简单解析建模

目前的工作旨在提出一个简单的两层分析模型，以确定混合碳/玻璃纤维增强PEEK （CG/PEEK）层压板在局部煤油火焰暴露（1100°C和116 kW/m2燃烧器台）下的残余弯曲性能。旨在更好地理解热致损伤与残余弯曲性能之间的关系，并预测弯曲性能随火焰暴露时间的变化。一方面，研究了等温加热条件（从熔点到树脂分解点的温度范围）引起的孔隙率对热后弯曲性能的影响，从而可以解离PEEK基体不同相变的影响。随着暴露温度和加热时间（400 ~ 450 ~ 500 ~ 525 ~ 550℃、300 ~ 600 ~ 900 s）的增加，热降解层压板的残余抗弯强度和刚度迅速降低。这些等温测试允许制定主曲线，显示孔隙率和残余弯曲性能之间的相关性。这些主曲线与贯穿厚度观测相结合，有望提供不同层的火灾后弯曲行为的综合解释。另一方面，通过考虑到与火焰的不同距离的两层（炭层和分解层）模型，可以确定火灾后CG/PEEK层压板的残余弯曲性能作为火焰暴露时间的函数。所提出的分析模型与实验结果（初步研究结果）吻合良好，并突出了焦炭层及其在长时间火焰照射下的残余性能的重要作用。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.