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工程科学与技术:2022,54(5):218-227
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抗爆型聚脲涂层性能及其防护钢筋混凝土板接触爆炸与断裂机制研究
(青岛理工大学 土木工程学院,山东 青岛 266033)
Study on the Performance of Blast-mitigation Polyurea and Fracture Mechanism of the Coated Reinforced Concrete Slabs Under Contact Explosion
(School of Civil Eng., Qingdao Univ. of Technol., Qingdao 266033, China)
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投稿时间:2021-06-29    修订日期:2021-11-11
中文摘要: 本文借助动态热机械实验,研究Qtech T26抗爆型聚脲(简称为T26聚脲)的动态热机械性能;采用10 kg 三硝基甲苯(trinitrotoluene,TNT)接触爆炸试验,研究T26聚脲防护钢筋混凝土板在接触爆炸作用下的防护性能;基于Williams-Landel-Ferry方程拟合T26聚脲的损耗模量、储能模量和损耗因子主曲线,并采用扫描电子显微镜对涂层防护钢筋混凝土板迎爆面和背爆面涂层的典型区域进行微观断口形貌分析,探讨其断裂机制。结果表明:T26聚脲受频率影响明显,在热机械性能层面印证了T26聚脲的应变率敏感性;在外界荷载作用频率大于等于1000 Hz时,T26聚脲的损耗因子保持在0.24以上,吸能效率高;喷涂10 mm T26聚脲涂层的钢筋混凝土板在10 kg TNT接触爆炸破坏下,背爆面涂层完整,无任何破片飞出;迎爆面T26聚脲与混凝土未脱离,T26聚脲与混凝土界面之间在表面处理之后附着力较好,在爆炸产生的拉伸波作用下,涂层与混凝土间仍有良好的附着性。T26聚脲在爆炸荷载作用下的断裂机制表现为高温力学性能失效机制、高温与冲击荷载耦合断裂机制、高速荷载脆性断裂机制和拉伸断裂机制;背爆面最大变形区域为纵向变形区域外侧的圆环区,背爆面中心区域在防护过程中承受高应变率荷载,出现少量脆性破坏。T26聚脲实现了接触爆炸零破片的防护效果,这一效果对实际工程中结构爆炸防破片具有极高的应用价值。
中文关键词: 聚脲  抗爆防护  时温等效  断裂机制
Abstract:To study the properties of Qtech T26 blast-mitigation polyurea (T26 polyurea) and the protective properties and fracture mechanism of T26 polyurea-protected reinforced concrete slabs under contact blast action, dynamic thermomechanical analysis and 10 kg trinitrotoluene (TNT) contact blast tests were carried out. The polymer master curve was fitted based on the Williams, Landel, Ferry equation and a scanning electron microscope was used to analyze the microscopic fracture morphology of typical areas on the blast face and back face of the coated reinforced concrete slab. The results showed that T26 polyurea is significantly influenced by frequency, confirming the strain rate sensitivity of T26 polyurea in terms of its thermomechanical properties. The loss factor of T26 polyurea remains above 0.24 when the external load frequency is greater than or equal to 1000 Hz, resulting in high energy absorption efficiency. The reinforced concrete slab with a 10 mm T26 polyurea coating was damaged by 10 kg TNT contact blast with the back blast surface coating intact and no fragments flying out. T26 polyurea on the blast face was not detached from the concrete, and the adhesion between T26 polyurea and concrete interface was quite good after surface treatment, which means that there was still favorable adhesion between the coating and concrete under the tensile wave generated by the explosion.The fracture mechanism of T26 polyurea under blast loading is characterized by high temperature mechanical property failure mechanism, coupled high temperature and impact loading fracture mechanism, high speed loading brittle fracture mechanism and tensile fracture mechanism. The area of maximum deformation of the backblast surface is the circular area on the outside of the longitudinal deformation area, the central area of the backblast surface is subjected to high strain rate loads during protection and a small amount of brittle damage occurs. T26 polyurea has achieved contact explosion with zero fragmentation protection, showing a great value for structural blast fragmentation protection in practical engineering.
文章编号:202100619     中图分类号:TB34;O383+.2    文献标志码:
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作者简介:第一作者:张锐(1993—),男,博士生. 研究方向:结构抗爆防护. E-mail:zhangray126@126.com;通信作者:黄微波, E-mail:huangweibo@qut.edu.cn
引用文本:
张锐,黄微波,吕平,孙鹏飞,方志强,王荣珍.抗爆型聚脲涂层性能及其防护钢筋混凝土板接触爆炸与断裂机制研究[J].工程科学与技术,2022,54(5):218-227.
ZHANG Rui,HUANG Weibo,LYU Ping,SUN Pengfei,FANG Zhiqiang,WANG Rongzhen.Study on the Performance of Blast-mitigation Polyurea and Fracture Mechanism of the Coated Reinforced Concrete Slabs Under Contact Explosion[J].Advanced Engineering Sciences,2022,54(5):218-227.