建筑钢结构进展2026，Vol.28Issue(5)：82-94,13.DOI:10.13969/j.jzgjgjz.20241108003
单调荷载作用下Q355冷弯薄壁型钢平板和角部材料延性断裂性能研究
Ductile Fracture Behavior of Flat and Corner Materials in Q355 Cold-Formed Thin-Walled Steel under Monotonic Loading
摘要
Abstract
This paper presents an experimental and numerical investigation on the ductile fracture of Q355 cold-formed thin-walled steel flat and corner materials.A total of 58 coupons were tested under monotonic loading,and representative specimens were selected for metallographic observation.For each coupon,the fracture strain and stress state were obtained using refined finite element simulations.Based on the numerical results,the material parameters of five selected fracture models,including Rice-Tracey type model with two parameters(RT2),Rice-Tracey type model with three parameters(RT3),maximum shear stress(MSS),CrashFEM(CF)and VNISFM models,were calibrated.Subsequently,the best-fitting fracture model was implemented via a Usdfld subroutine to verify its accuracy.The results show that the fracture strain of dog-bone specimens increases with the increase of cold bending degree,while the notched specimens show an opposite trend,and the cold bending degree has little effect on the fracture strain of shear specimens.Among the five fracture models,the RT2 model and CF model cannot properly simulate the fracture behavior as they exclusively consider stress triaxiality,while the RT3 model is able to yield satisfactory predictions for both the flat and corner specimens.关键词
冷弯薄壁型钢/单调加载试验/延性断裂准则/断裂模型/试验研究/精细化有限元模拟/断裂应变Key words
cold-formed thin-walled steel/monotonic loading test,ductile fracture criterion/fracture model/experimental investigation/refined finite element simulation/fracture strain分类
建筑与水利引用本文复制引用
张汉文,任重,戴柳丝,闫伸..单调荷载作用下Q355冷弯薄壁型钢平板和角部材料延性断裂性能研究[J].建筑钢结构进展,2026,28(5):82-94,13.基金项目
国家自然科学基金(52578218、51908347),上海市自然科学基金(No.22ZR1422700) （52578218、51908347）
