(1 四川省建筑设计研究院有限公司, 成都 610095; 2 西南石油大学 (南充校区), 南充 637000;3 西南石油大学 (成都校区), 成都 610000)

摘要: 韧性断裂作为结构钢的一种重要破坏形式,近年来吸引了许多学者对其进行研究. 为研究结构韧性断裂的本构关系,首先从塑性全量理论出发,基于四个假定引入了修正外形曲线的材料系数,详细推导了钢材主应力面上塑性应变分布的数学模型;然后,基于图形散斑相关法(DIC)拟合标定了 Q235 及 Q345 结构钢的修正外形曲线的材料系数. 通过研究,给出了一种精确的计算结构钢大塑性变形主应力上应变分布的方法,以期为今后研究和预防钢结构韧性断裂提供参考.

关键词: 结构钢; 塑性应变分布; 韧性断裂; 图形散斑相关法

中图分类号:TU313. 2 文献标志码:A 文章编号:1002-848X(2023)07-0104-05

DOI:10. 19701 / j. jzjg. SADI2311

Study on plastic strain distribution of structural steel based on Digital Image Correlation (DIC) method

ZHENG Jian1, XIAN Anjiang1, LIU Yubo1, TANG Shu2, DONG Shier3

(1 Sichuan Architectural Design and Research Institute Co. , Ltd. , Chengdu 610095, China;2 Southwest Petroleum University (Nanchong Campus), Nanchong 637000, China;3 Southwest Petroleum University (Chengdu Campus), Chengdu 610000, China)

Abstract: As an important failure form of structural steel, ductile fracture has attracted many scholars to study it in recentyears. In order to study the constitutive relation of ductile fracture of structures, first starts from the plastic total quantitytheory, the material coefficient of the modified profile curve was introduced based on four assumptions, and themathematical model of plastic strain distribution on the principal stress surface of steel was deduced in detail. Then, basedon the Digital Image Correlation (DIC) method, the material coefficients of the modified profile curves of Q235 and Q345structural steels were fitted and calibrated. Through the research, an accurate method for calculating the strain distributionon the principal stress of large plastic deformation of structural steel was presented in order to provide reference for futureresearch and prevention of ductile fracture in steel structures.

Keywords:structural steel; plastic strain distribution; ductile fracture; Digital Image Correlation (DIC) method

∗国家自然科学基金项目(52208211).

第一作者:郑健,硕士,高级工程师,一级注册结构工程师,主要从事结构设计工作,Email:2651526873@ qq. com.

[引用本文] 郑健,鲜岸江,刘育博,等. 基于图形散斑相关法(DIC)的结构钢塑性应变分布研究[ J]. 建筑结构,2023,53(7):104-108,129. ZHENG Jian,XIAN Anjiang,LIU Yubo,et al. Study on plastic strain distribution of structuralsteel based on Digital Image Correlation (DIC) method[J]. Building Structure,2023,53(7):104-108,129.