秸秆纤维复合墙体的湿热耦合特性及热爆机理  

Heat-moisture Transfer and Thermal Explosion Feature of Fiber-reinforced Composites

作　　者：王海蓉[1,2] 赵哲[1] 杨文兵[1] 梁栋[1,2] 

机构地区：[1]中山大学工学院,广东广州510275 [2]广东省消防科学技术重点实验室,广东广州510006

出　　处：《湖南大学学报（自然科学版）》2012年第6期30-34,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(11172333);广东省科技计划项目(2010A060801010)

摘　　要：通过非稳态热流法和PCK实验装置测定秸秆纤维复合墙体的基本热物理量,研究了温度对秸秆纤维复合墙体的热传导和湿迁移特性的影响,并得到了导热系数、湿迁移系数与温度的简化关系式.考虑秸秆纤维增强水泥非均匀的材料特性,建立了秸秆纤维复合墙体在火灾条件下的一维湿热耦合数值分析模型,实现了材料试件由裂纹萌生、扩展到贯通的全过程数值模拟.对比不同时刻材料试件的温度分布、压力分布和裂纹深度,研究了各试件的峰值强度、裂纹深度和爆裂特性.对不同含水率的秸秆纤维复合墙体进行受热后的现场测试,验证材料的热爆性能及数值分析结果,结果表明:两者基本一致,且湿迁移系数越大,压力峰值越大,材料越不易爆裂.Through non-steady-state heat flow method and the PCK experimental device, the basic thermal physical quantities of fiber-reinforced composites were determined, the temperature on the heat transfer and wet migration characteristics was investigated, and the simplified equations between thermal conductivity, moisture diffusion coefficient and temperature were obtained. Considering the non-uniform of fiber-reinforced composites, one-dimensional humidity and heat transfer numerical analysis model of fiber- reinforced composites in fire condition were established. Numerical simulations of the material from crack initiation to thorough extension were conducted. Contrast material specimen at different times, the tem- perature distribution, pressure distribution and the crack depth, the peak intensity, the crack and burst characteristics were studied. Fiber-reinforced composites with different moisture contents after heating were tested to verify the performance of the thermal explosion and numerical analysis of indicators. The re- suits have shown that the test and numerical analysis are basically the same and the pressure peak grows with the migration coefficient, making the materials durable.

关 键 词：秸秆纤维复合墙体 湿迁移 热质传递 热爆 

分 类 号：X91[环境科学与工程—安全科学]