Cracking quantification of wood exposed to constant heat fluxes

IF 3.3 3区工程技术 Q2 ENGINEERING, CIVIL

Fire Safety Journal Pub Date : 2025-09-26 DOI:10.1016/j.firesaf.2025.104546

Boris Aguilar , Pedro Reszka , Zoubir Acem , Pascal Boulet , Gilles Parent , Lucas Terrei

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引用次数: 0

Abstract

Surface cracking of wood when exposed to a heat source is one of the factors understudied by the fire community despite the fact that the cracks may guide the release of pyrolysis gases, inducing heterogeneity in the effusion of gas and therefore may affect ignition and extinction of flame at the material surface. This study aimed to develop a dynamic detection method for characterizing wood cracking during fire tests by providing quantities such as surface area, length, and number of cracks. Spruce samples were exposed to a wide range of heat fluxes during for at least 40 min using a vertical cone calorimeter. An infrared camera with a specific filter wavelength was used to track crack formation. A total of 74 experiments were carried out in air, and seven were carried out in an oxygen-free atmosphere to determine the cracking dynamics of the wood. The results show that the cracking rate and the number of cracks quickly reach to a constant value. The heat flux and the presence of oxygen are not dominant factors in wood’s dynamic cracking. This work provides quantitative data for readers interested in accounting for cracking and heterogeneous pyrolysis gas release on the surface of a sample.

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暴露在恒定热通量下的木材的开裂量化

木材在热源下的表面开裂是火学界尚未研究的因素之一，尽管这些裂缝可能会引导热解气体的释放，导致气体渗出的非均质性，从而可能影响材料表面火焰的点燃和熄灭。本研究旨在开发一种动态检测方法，通过提供诸如表面面积、长度和裂纹数量等数量来表征木材在火灾试验中的开裂。云杉样品暴露在大范围的热通量至少40分钟期间使用垂直锥量热计。采用具有特定滤光波长的红外摄像机跟踪裂纹的形成。在空气中进行了74次实验，在无氧气氛中进行了7次实验，以确定木材的开裂动力学。结果表明，裂纹速率和裂纹数很快达到一个恒定值。热通量和氧的存在不是木材动态开裂的主导因素。这项工作为有兴趣的读者提供了定量数据，说明裂解和异质热解气体释放在一个样品的表面。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fire Safety Journal 工程技术-材料科学：综合

CiteScore

5.70

自引率

9.70%

发文量

153

审稿时长

60 days

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.