Tim J. Aspinall , Emmajane L. Erskine , Kevin A. Denham , Derek C. Taylor , Rory M. Hadden
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The mechanical degradation includes upward shear buckling of the horizontal flanges and vertical web, along with outward buckling of the vertical web towards the heat source. The study shows that thermal decomposition and mechanical degradation occur simultaneously, influenced by heat flux intensity. Higher heat fluxes accelerate decomposition and reduce load-bearing capacity, while lower fluxes slow degradation. Displacement data indicates that heat flux intensity significantly affects structural response. Temperature measurements show higher fluxes lead to elevated temperatures and steeper gradients, impacting failure times and modes. Increased temperatures correlate with shorter failure times, and variability in failure times decreases as heat flux rises. These insights are significant for understanding the thermomechanical response of C-channels in aircraft sub-structures. 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引用次数: 0
摘要
本研究使用一种结合了机械加载和辐射热暴露的台式设备,对碳纤维增强聚合物(CFRP)C 型槽的热机械响应进行了研究。该研究旨在评估预加载 CFRP C 型槽在火灾条件下的行为,它代表了飞机的子结构。在悬臂点荷载挠度下对编织预浸料 CFRP C 型槽进行了测试,同时暴露在不同的热通量下。研究的主要内容包括失效时间、位移、温度分布和失效模式。研究结果表明,加热的预加载 C 型槽经历了不同阶段的物理化学分解和机械退化。机械退化包括水平翼缘和垂直腹板的向上剪切屈曲,以及垂直腹板向热源的向外屈曲。研究表明,热分解和机械降解是同时发生的,受热流强度的影响。较高的热通量会加速分解并降低承载能力,而较低的热通量则会减缓退化。位移数据表明,热通量强度对结构响应有显著影响。温度测量结果表明,较高的热通量会导致温度升高和梯度增大,从而影响失效时间和失效模式。温度升高与失效时间缩短相关,而失效时间的变化则随着热通量的升高而减小。这些见解对于了解飞机子结构中 C 型通道的热机械响应具有重要意义。所获得的知识有助于开发更坚固、更安全的飞机设计,特别是暴露在火灾条件下的部件,使工程师能够为 CFRP 结构建立更精确的安全系数,从而有可能防止灾难性故障,进而提高飞机的整体安全性。
Bench-scale thermomechanical assessment of carbon fibre reinforced polymer C-channels
This study investigates the thermomechanical response of carbon fibre reinforced polymer (CFRP) C-channels using a bench-scale apparatus that combines mechanical loading and radiant thermal exposure. The study aims to assess the behaviour of pre-loaded CFRP C-channels, representative of aircraft sub-structures when subjected to fire conditions. Woven prepreg CFRP C-channels were tested under cantilever point load deflection while exposed to varying heat fluxes. Key aspects examined during the study include failure times, displacement, temperature distribution, and failure modes. The findings reveal that heated, pre-loaded C-channels experience distinct phases of physico-chemical decomposition and mechanical degradation. The mechanical degradation includes upward shear buckling of the horizontal flanges and vertical web, along with outward buckling of the vertical web towards the heat source. The study shows that thermal decomposition and mechanical degradation occur simultaneously, influenced by heat flux intensity. Higher heat fluxes accelerate decomposition and reduce load-bearing capacity, while lower fluxes slow degradation. Displacement data indicates that heat flux intensity significantly affects structural response. Temperature measurements show higher fluxes lead to elevated temperatures and steeper gradients, impacting failure times and modes. Increased temperatures correlate with shorter failure times, and variability in failure times decreases as heat flux rises. These insights are significant for understanding the thermomechanical response of C-channels in aircraft sub-structures. The knowledge obtained can contribute to developing more robust and safer aircraft designs, particularly for components exposed to fire conditions, enabling engineers to establish more precise safety margins for CFRP structures, potentially preventing catastrophic failures and thereby enhancing overall aircraft safety.
期刊介绍:
Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.