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首页> 外文期刊>Journal of structural fire engineering >Decomposing composite material structures Practical modelling issues for the large-scale fire tests
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Decomposing composite material structures Practical modelling issues for the large-scale fire tests

机译：分解复合材料结构进行大型火灾测试的实际建模问题

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Purpose - This paper aims to deal with numerical modelling of composite panels of naval industry exposed to fire. Finite element (FE) analyses have been used to study the thermomechanical behaviour of structures. This paper focuses more particularly on assumptions used to model and evaluate design performance of sandwich panels made of E-Glass vinyl ester and balsawood cored submitted to a certification fire test. Design/methodology/approach - The methodology consisted of having an advanced understanding of phenomena occurring in both thermal and mechanical behaviours when large structures are degraded under thermal solicitation. Then, properties measuring methods were explored and studied in relation with the size of the structure they are used to describe. Finally, several modelling strategies were compared and applied to large-size panels under ISO 834 fire conditions. Findings - Research studies and comparisons showed that for these types of material and these types of structure, non-linear thermomechanical behaviour can be performed with a so-called "reduced" thermal model, provided that properties are measured in an appropriate way. "Reduced" model was compared with "full" model, and results were close to experimental measures. A mechanical properties' review allowed selecting only necessary material FE analysis of large panels under ISO 834 fire. Originality/value - The research was conducted on real-size structures taking into account the real conditions in which structures are tested when passing certification. Work was carried out on reducing numerical model size without neglecting phenomenon or losing accuracy.
机译：目的-本文旨在处理暴露于火中的海军工业复合板的数值模型。有限元（FE）分析已用于研究结构的热机械行为。本文更特别地侧重于用于建模和评估由E-玻璃乙烯基酯和轻木芯的夹芯板的设计性能的假设，该夹芯板已通过防火认证。设计/方法/方法-该方法包括对大型结构在热力作用下降解时热行为和机械行为中发生的现象有深入的了解。然后，探索并研究了与它们用来描述的结构尺寸有关的性能测量方法。最后，比较了几种建模策略，并将其应用于ISO 834火灾条件下的大型面板。发现-研究和比较表明，对于这些类型的材料和这些类型的结构，可以使用所谓的“简化”热模型执行非线性热机械行为，只要以适当的方式测量其性能即可。将“简化”模型与“完全”模型进行了比较，结果接近于实验测量。机械性能审查允许仅在ISO 834火焰下选择大型面板的必要材料有限元分析。独创性/价值-考虑到在通过认证时测试结构的实际条件，对实际大小的结构进行了研究。进行了减小数值模型尺寸而不忽略现象或失去准确性的工作。

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