摘要
为了研究聚乙烯醇缩丁醛夹层玻璃(PVB夹层玻璃)在刚性冲击下的破坏模式和力学响应,采用基于近场动力学的键基PD模型模拟落锤冲击作用下的冲击力的变化情况及玻璃裂纹开展,并与试验结果进行对比验证;通过改变上、下玻璃层厚度、PVB胶层厚度及冲击初速度,系统研究PVB夹层玻璃的裂纹扩展规律和耗能特性。结果表明:键基PD模型可以很好地再现PVB夹层玻璃断裂失效和裂纹扩展行为,和试验吻合度很高;玻璃厚度越厚抗冲击性能和耗能能力越强,下玻璃层厚度影响大于上玻璃层厚度影响。随着PVB胶层厚度的增加,PVB夹层玻璃抗冲击性能以及耗能能力随之增加。同等条件下,增大PVB胶层厚度,能有效增加玻璃的耗能能力,取得较大的单位厚度耗能比,但PVB胶层厚度大于1.14mm后增幅变小。保持冲击能量不变,增大落锤的冲击初速度,明显改变了PVB夹层玻璃的破坏模式,其抗冲击性能和玻璃耗能也随之增加。
In order to study the damage pattern and mechanical response of polyvinyl butyral laminated glass(PVB laminated glass)under rigid impact,the bond-based PD model based on peridynamics was used to simulate the impact force and crack development of glass under the impact of drop hammer,and was compared with the test results.The crack expansion pattern and energy consumption characteristics of the PVB laminated glass were systematically studied by varying the upper and lower glass thicknesses,the thickness of PVB adhesive layer and the initial impact velocity.The results show that the bond-based PD model can simulate the spontaneous fracture failure and crack expansion behavior of PVB laminated glass,and the agreement with the test is high.The thicker the glass thickness,the stronger of impact resistance and energy dissipation capacity,and the effect of the lower glass layer thickness is greater than that of the upper glass layer thickness.As the thickness of PVB adhesive layer increases,the impact resistance and energy dissipation of PVB laminated glass increase.Under the same conditions,increasing the thickness of PVB adhesive layer can effectively increase the energy dissipation capacity of the glass and achieve a larger energy dissipation ratio per unit thickness,but the increase becomes smaller after the thickness of PVB adhesive layer is higher than 1.14mm.By keeping the impact energy unchanged and increasing initial impact velocity of the the drop hammer,the failure mode of PVB laminated glass is obviously changed,and the impact resistance and energy consumption of the glass are also increased.
作者
胡晓东
齐欣
赵仕兴
张丽君
余志祥
HU Xiaodong;QI Xin;ZHAO Shixing;ZHANG Lijun;YU Zhixiang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Provincial Architectural Design and Research Institute Co.,Ltd.,Chengdu 610095,China;Complex Structure Design and Research Center,Sichuan Provincial Architectural Design and Research Institute Co.,Ltd.,Chengdu 610095,China)
出处
《建筑结构》
北大核心
2023年第7期90-97,共8页
Building Structure
基金
四川省交通运输科技项目(2018-B-03)
2020年度交通运输行业重点科技项目(2020-MS3-101)。
关键词
近场动力学
PVB夹层玻璃
刚性冲击
胶层厚度
破坏模式
力学响应
peridynamics
PVB laminated glass
rigid impact
thickness of adhesive layer
failure mode
mechanical response
作者简介
第一作者:胡晓东,硕士研究生,主要从事结构冲击防护研究,Email:2423657135@qq.com;通信作者:赵仕兴,硕士,教授级高级工程师,一级注册结构工程师,英国注册结构工程师,主要从事高层建筑结构、复杂结构的设计与研究,Email:316458931@qq.com。
