吸气剂形状对钢化真空玻璃弯曲性能的影响及安全性评价

Influence of getter shape on bending properties and safety evaluation of tempered vacuum glass

钢化真空玻璃作为一种新型安全玻璃,近年来被越来越多地应用在高层建筑的外墙、窗体等部位。抗弯强度作为钢化真空玻璃最重要的力学性质之一,更加备受关注。分别采用长条形吸气剂和圆片状吸气剂对2组钢化真空玻璃进行了四点弯曲试验,得到了2组试件的载荷-位移曲线图,分析了玻璃试样受弯破坏过程的3个阶段,得到了不同吸气剂形状对钢化真空玻璃弯曲性能的影响。试验结果表明,由于玻璃试样表面存在预压应力层,不同玻璃试样的破坏形态趋于一致,其中采用长条形吸气剂比采用圆片状吸气剂有更好的极限承载能力和挠度。同时提出了一种钢化真空玻璃安全性评价方法——安全因数,采用长条形吸气剂的钢化真空玻璃比采用圆片状吸气剂的安全因数提升6.7%,更具安全性和可靠性。这也为高层建筑采用钢化真空玻璃作为建筑材料提供了一个佐证理论。

As a new type of safety glass,tempered vacuum glass has been more and more used in the exterior walls and windows of high-rise buildings in recent years.As one of the most important mechanical properties of tempered vacuum glass,bending strength has attracted more attention.Four-point bending test was carried out on two groups of tempered vacuum glass with strip and circular getter respectively.The load-displacement diagrams of two groups of specimens were obtained,and the three stages of the bending failure process of glass specimens were analyzed.The influence of different shapes of getter on the bending properties of tempered vacuum glass was obtained.The test results show that the failure modes of different glass samples tend to be the same due to the existence of precompression stress layer on the surface of the glass samples,and the elongated getter has better ultimate bearing capacity and deflection than the circular getter.At the same time,a kind of safety evaluation method of tempered vacuum glass,safety factor,is proposed.The safety factor of tempered vacuum glass using strip getter is 6.7%higher than that of round getter,which is more safe and reliable.It also provides an supporting theory for high-rise buildings to use tempered vacuum glass as building materials.