摘要
选择典型的普通平板玻璃和钢化玻璃作为研究对象,利用火灾痕迹物证综合实验台、箱式电阻炉模拟室内火灾的热环境,制备了两种典型玻璃的破坏痕迹,通过电子扫描显微镜(SEM)观察玻璃破坏痕迹的微观形貌。实验结果表明:玻璃种类对机械破坏痕迹的微观形貌有一定的影响,钢化玻璃的裂纹比较密集,裂纹比较深;而普通玻璃的裂纹的纹痕比较明显,在扫描电镜下观察时裂纹棱角比较突出,并且呈"人"字形的树杈状分布。温度对玻璃的机械破坏痕迹和受热破坏痕迹的微观形貌影响有所不同,尤其是对机械破坏的断面痕迹的影响,机械破坏的普通玻璃在受热后的玻璃断面失去了弓形纹特征。钢化玻璃遇水炸裂产生的纹痕随着温度的升高,裂纹由密集逐渐变得疏松,纹痕也越来越明显。
In order to analyze the influence of damage pattern,and the scheduled temperature and duration on the feature of the glass traces,the microstructures of the damaged glassed were investigated.Sheet glass and tempered glass damage traces were prepared by simulating the indoor fire scene using fire traces comprehensive evidence experiment board and chamber electric furnace,and the microstructure of the glass traces were investigated by scanning electron microscope （SEM）.The results showed that the tempered glass and sheet glass revealed different mechanical damaged microstructure,the fault traces of tempered glass are more compact distributed and the crack is deeper; while the sheet glass crack is obvious with sharp edges and corners,simultaneously,the typical ＂Y＂ glyph distribution with branch structure was observed in sheet glass.The influence of temperature on the microstructure of glass is different for mechanical damage or heat damage,and the effect is more remarkable for mechanical damage,bow grain characteristics will be lost when the mechanical damaged sheet glass reheated.The fault traces of tempered glass become looser and more obvious as the environment temperature increased.
出处
《消防科学与技术》
CAS
北大核心
2014年第10期1215-1218,共4页
Fire Science and Technology
基金
公安部一般项目(2013YYCXWJXY104)
武警学院青年基金项目(QNJS201327)
