真空玻璃支撑压痕控制准则

刘小根¹, 包亦望¹, 许海凤², 王秀芳¹

1.中国建筑材料科学研究总院绿色建材国家重点实验室;2.北京新立基真空玻璃技术有限公司



摘要:

为避免过大的支撑物支撑应力导致真空玻璃基片赫兹裂纹的产生,首先建立了力学模型,分析了支撑物接触部位玻璃的应力分布特征.应用Griffith断裂理论和均强度理论,分别得到了玻璃基片在不产生压痕下支撑物的最大临界支撑力计算公式.通过与试验结果进行比较,发现两种理论计算结果均与试验结果相吻合,,但断裂力学理论得到的支撑物临界支撑力比试验结果偏小,而均强度准则结果偏大.对真空玻璃结构设计,在已知的真空玻璃材料参数下,根据上述理论,计算出玻璃基片不产生压痕下支撑物的最大临界支撑力,从而确定支撑物最佳排列间距,使真空玻璃达到"热学与力学"最佳配制.

关键词:  真空玻璃  压痕  Griffith断裂理论  均强度理论  临界支撑力

DOI：10.11951/j.issn.1005-0299.20100629

分类号:TU524

基金项目:国家自然科学基金项目(50672093,50772103);北京市自然基金项目(2102047);国家高技发展计划资助项目(2007AA03Z526)



Propagation mechanism and control criterion of fracture indentation in vacuum glazing

LIU Xiao-gen¹, BAO Yi-wang¹, XU Hai-feng², WANG Xiu-fang¹

1.China Building Material Academy,Key State Laboratory of Green Building Materials,Beijing 100024,China;2.Beijing Synergy Vacuum Glazing Technology Company,Beijing 101111,China

Abstract:

To avoid cone crack occurring on the inside of glass plates adjacent to the support pillars,a mechanical model was established and the stress distribution adjacent to the support pillars was analyzed.The critical supporting force of the pillar was determined based on the theory of Griffith fracture mechanism criterion and mean stress criterion.The calculated results agree well with the experimental ones.Considering mechanical and thermal combination,an optimization design for vacuum glazing can be obtained by this new mechanical model.

Key words:  vacuum glazing  indentation  Griffith fracture theory  mean-stress theory  critical supporting force