| 摘要: |
| 采用自动球压冲击仪对钢结构聚氨酯涂层进行冲击试验，研究不同冲击高度下钢结构涂层冲击损伤区压痕的扩展规律，并通过计算动态硬度和恢复性系数来分析钢结构涂层的弹塑性特征.结果表明：随着冲击高度的增加，压痕尺寸不断增大；压痕应力随着压痕应变的增大先降低后再略有回增，此时涂层基本失去了防护效果；压痕内部及边缘产生环向裂纹、径向微裂纹及长裂纹，涂层在径向长裂纹末端2~3 mm范围内发生凸起；动态硬度和恢复性系数随着冲击高度的增加逐渐下降，涂层抗变形能力降低. |
| 关键词: 冲击荷载 压痕 动态硬度 恢复系数 |
| DOI：10.3969/j.issn.1007-9629.2022.09.007 |
| 分类号:TU561.02 |
| 基金项目:国家自然科学基金资助项目（11862022，11162011，51468049，11662012）；内蒙古自治区自然科学基金资助项目（2018MS05047）；内蒙古自治区青年科技英才支持计划项目（NJYT-17-A09）；内蒙古自治区草原英才资助项目 |
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| Analysis of Impact Damage Characteristics and Elastoplastic Characteristics of Steel Structure Coating |
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HAO Yunhong1,2,3, WANG Ting1, XUAN Jiaoyu1, LIU Yanchen1
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1.School of Civil Engineering， Inner Mongolia University of Technology， Hohhot 010051， China;2.The Inner Mongolia Key Laboratory of Civil Engineering Structure and Mechanics， Inner Mongolia University of Technology， Hohhot 010051， China;3.Inner Mongolia Autonomous Region Engineering Research Center of Structure Inspection， Appraisal and Safety Assessment， Inner Mongolia University of Technology， Hohhot 010051， China
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| Abstract: |
| In order to study the indentation expansion law of the impact damage zone of the steel structure coatings under different impact heights and to analyze the elastoplastic characteristics of the steel structure coatings by calculating dynamic hardness and recovery coefficient the impact test of polyurethane coatings on steel structures was carried out with an automatic ball pressure impact meter The results show that the size of the indentation increases with the increase of the impact height. The indentation stress decreases first and then increases slightly with the increase of the indentation strain. The increase in the indentation stress indicates that the coating has basically lost its protective effect. The inside and edges of the indentation circumferential cracks， radial micro-cracks and long cracks are produced. The coating bulges within 2-3 mm from the end of the radial long crack. The dynamic hardness and recovery coefficient gradually decrease with the increase of impact height， and the coating's anti-deformation ability decreases. |
| Key words: impact loading indentation dynamic hardness coefficient of restitution |
