(1 西南交通大学土木工程学院, 成都 610031; 2 四川省建筑设计研究院有限公司, 成都 610095;3 四川省建筑设计研究院有限公司复杂结构设计研究中心, 成都 610095)

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.

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

中图分类号:TU524 文献标志码:A 文章编号:1002-848X(2023)07-0090-08

DOI:10. 19701 / j. jzjg. SADI2319

Numerical simulation of drop hammer impact on PVB laminated glass based on peridynamics

HU Xiaodong1, QI Xin1, ZHAO Shixing2,3, ZHANG Lijun1, YU Zhixiang1

(1 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2 Sichuan ProvincialArchitectural Design and Research Institute Co. , Ltd. , Chengdu 610095, China; 3 Complex StructureDesign and Research Center, Sichuan Provincial Architectural Design andResearch Institute Co. , Ltd. , Chengdu 610095, China)

Abstract: In order to study the damage pattern and mechanical response of polyvinyl butyral laminated glass ( PVBlaminated glass) under rigid impact, the bond-based PD model based on peridynamics was used to simulate the impactforce and crack development of glass under the impact of drop hammer, and was compared with the test results. The crackexpansion pattern and energy consumption characteristics of the PVB laminated glass were systematically studied by varyingthe upper and lower glass thicknesses, the thickness of PVB adhesive layer and the initial impact velocity. The results showthat the bond-based PD model can simulate the spontaneous fracture failure and crack expansion behavior of PVB laminatedglass, and the agreement with the test is high. The thicker the glass thickness, the stronger of impact resistance and energydissipation 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 glassincrease. Under the same conditions, increasing the thickness of PVB adhesive layer can effectively increase the energydissipation capacity of the glass and achieve a larger energy dissipation ratio per unit thickness, but the increase becomessmaller after the thickness of PVB adhesive layer is higher than 1. 14mm. By keeping the impact energy unchanged andincreasing 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.

Keywords:peridynamics; PVB laminated glass; rigid impact; thickness of adhesive layer; failure mode; mechanical response

∗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-MS3-10

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.

[引用本文] 胡晓东,齐欣,赵仕兴,等. 基于近场动力学的落锤冲击 PVB 夹层玻璃数值模拟[ J]. 建筑结构,2023,53(7):90-97. HU Xiaodong,QI Xin,ZHAO Shixing,et al. Numerical simulation of drop hammer impact on PVB laminatedglass based on peridynamics[J]. Building Structure,2023,53(7):90-97.