基于图形散斑相关法DIC)的结构钢塑性应变分布研究
引用文献：
郑健 鲜岸江 刘育博 唐姝 董事尔. 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，2023，48（07）：104-108，129.
ZHENG Jian XIAN Anjiang LIU Yubo TANG Shu DONG Shier. Study on plastic strain distribution of structural steel based on Digital Image Correlation (DIC) method[J]. Building Structure，2023,48（07）：104-108，129.
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；
基金：国家自然科学基金项目(52208211)。
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参考文献[1] 钢结构设计标准：GB 50017—2017[S].北京：中国建筑工业出版社，2018.
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[2] 王万祯，顾强，孙玉萍.延性金属在应力三轴空间的裂纹形成准则[J].建筑结构，2007,37(6):71-73,84.
[3] BUTCHER C,CHEN Z T,WORSWICK M.Integration of a particle-based homogenization theory into a general damage-based constitutive model to improve the modelling of void nucleation to coalescence[J].Acta Mechanica,2013,224(1):139-156.
[4] RICE J R,TRACEY D M.On the ductile enlargement of voids in triaxial stress fields[J].Journal of Mechanics and Physics of Solids,1969,17(3):201-217.
[5] HANCOCK J W,MACKENZIE A C.On the mechanisms of ductile failure in high-strength steels subjected to multi-axial stress-states[J].Journal of the Mechanics and Physics of Solids,1976,24(2/3):147-160.
[6] JOHNSON G R,COOK W H.Fracture characteristics of three metals subjected to various strains,strain rates,temperatures and pressures[J].Engineering Fracture Mechanics,1985,21(1):31-48.
[7] 施刚，班慧勇，石永久，等.高强度钢材钢结构研究进展综述[J].工程力学，2013,30(1):1-13.
[8] BRIDGMAN,WILLIAMS P .Studies in large plastic flow and fracture[J].Harvard University Press,1964.
[9] 张克实，马若涓，华利生，等.轴对称拉伸试件的大应变弹塑性有限元分析[J].西北工业大学学报，1988,6(3):331-341.
[10] DONG S E,XIAN A J,LIAN Z H,et al.Necking phenomenon based on the Aramis system[J].Proceedings of the Institution of Mechanical Engineers,Part C:Journal of Mechanical Engineering Science,2019,233(11):3904-3916.
[11] DONG S E,XIAN A J,MOHAMED H S,et al.A simplified analytical solution for the necking semi-empirical stresses based on aramis system[J].KSCE Journal of Civil Engineering,2019,23(1):268-279.
[12] 陈篪.金属断裂研究文集[M].北京：冶金工业出版社，1978.
[13] 金属材料室温拉伸试验方法：GB/T 228—2002[S].北京：中国标准出版社，2002.
Study on plastic strain distribution of structural steel based on Digital Image Correlation (DIC) method
Abstract: As an important failure form of structural steel, ductile fracture has attracted many scholars to study it in recent years. In order to study the constitutive relation of ductile fracture of structures, first starts from the plastic total quantity theory, the material coefficient of the modified profile curve was introduced based on four assumptions, and the mathematical model of plastic strain distribution on the principal stress surface of steel was deduced in detail.Then, based on the Digital Image Correlation(DIC) method, the material coefficients of the modified profile curves of Q235 and Q345 structural steels were fitted and calibrated. Through the research, an accurate method for calculating the strain distribution on the principal stress of large plastic deformation of structural steel was presented in order to provide reference for future research and prevention of ductile fracture in steel structures.
Keywords: structural steel; plastic strain distribution; ductile fracture; Digital Image Correlation(DIC) method
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