摘要
根据内蒙古中西部地区风沙环境特征,采用气流挟沙喷射法,通过模拟风沙环境侵蚀实验系统,对比分析冲蚀力学参数对不同特性工程玻璃冲蚀率的影响规律,并结合扫描电镜(SEM)分析其损伤机理。结果表明:钢化玻璃的冲蚀率随冲蚀角度的增加而增大,在90°时达到最大值,表现出脆性材料的特征;有机玻璃的冲蚀率随冲蚀角度增加先增大后减小,在45°处达到最大值,90°时为最小值,表现出半塑性材料的特征。两种玻璃的冲蚀率随沙流量的增加,先迅速减小后趋于平缓;随速度的增加而增加。在高角度冲蚀时,钢化玻璃和有机玻璃冲蚀率和冲蚀速度回归曲线的速度指数较接近,分别为3.94和3.66,均偏离了理论预测的范围。钢化玻璃高角度冲蚀损伤严重,其表面冲蚀损伤机理是与塑性区相关的残余应力,在冲击部位产生横向裂纹,裂纹不断扩展在材料表面交叉引起材料流失;有机玻璃低角度冲蚀磨损严重,其损伤机制主要是微切削作用,损伤程度由材料的硬度控制。
According to the characteristics of sandstorm environment in the central and western Inner Mongolia,using sand-air injection method,the influence law of erosion mechanics parameters on the erosion rate of engineering glass with different characteristics was compared and analyzed by erosion test rig for simulating sandstorm environment. The damage mechanism was analyzed combining with scanning electron microscope（ SEM）. The results show that the erosion rate of tempered glass increases with the increase of erosion angle and reaches the maximum value at 90°,which shows the characteristics of brittle materials. The erosion rate of Perspex increases first and then decreases with increasing erosion angle,reaching the maximum value at 45° and the minimum value at 90°,showing the characteristics of the semi-plastic material. The erosion rate of two kinds of glass decreases rapidly and then tends to be gentle with the increase of sand flow rate,and increases with the increase of velocity. At high angle erosion,the velocity exponents of the erosion fitting curve of tempered glass and Perspex are close to each other,which are respectively 3. 94 and 3. 66,deviating from the theoretical prediction range. High-angleerosion of tempered glass is serious,and its surface erosion damage mechanism is that the residual stress related to the plastic zone produces transverse cracks in the impact site and the crack propagates continuously to cause the material loss. The low angle erosion of Perspex is serious,and its damage mechanism is mainly micro-cutting,and the damage degree is controlled by the hardness of the material.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2017年第11期3721-3727,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(11662012
11162011
51468049)
内蒙古自治区人才开发基金
关键词
气固两相流
钢化玻璃
有机玻璃
冲蚀
损伤机理
gas-solid two-phase flow
tempered glass
Perspex
erosion
damage mechanism
