| 冲击荷载下C型G550冷弯钢的断裂机理研究 |
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| 引用本文： | 张子凌,岑志波,蒋磊,李佰树,汪家炜,张浩,朱珏.冲击荷载下C型G550冷弯钢的断裂机理研究[J].宁波大学学报(理工版),2022,35(1):90-97. |
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| 作者姓名： | 张子凌 岑志波 蒋磊 李佰树 汪家炜 张浩 朱珏 |
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| 作者单位： | 1.宁波大学 冲击与安全工程教育部重点实验室, 浙江 宁波 315211; 2.宁波市特种设备检验研究院, 浙江 宁波 315048 |
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| 基金项目： | 国家自然科学基金（11972203,11572162）；;浙江省自然科学基金（LY13A020007）；;宁波市自然科学基金（202003N4152）； |
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| 摘 要： | 以C型G550薄壁冷弯钢构件为研究对象, 通过材料在不同应变率下的拉伸实验和数值模拟数据得到Johnson-Cook (J-C)本构模型和Johnson-Cook失效模型参数. 通过Abaqus软件模拟了不同冲击荷载作用下C型冷弯钢构件撕裂破坏的全过程, 利用落锤装置轴向冲击试验进行对比, 其实验结果与有限元数值模拟结果有良好的一致性. 此外, 对冲击试样撕裂断口进行微观形貌分析, 得到构件的断裂机理. 结果表明: 随着冲击速度的提高, 冲击力对构件的加载时间增加, 构件需要较大的塑性变形来吸收冲击能量; 冲击速度越高, 裂纹扩展功所占吸收冲击能量的比例越大, 显示出高速下裂纹扩展的能力越好; 冲击速度较高时, 以脆性断裂为主, 断口出现解理面, 甚至在高速变形时发生了绝热剪切破坏.
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| 关 键 词： | 冷弯钢 Johnson-Cook模型 有限元模拟 撕裂 塑性变形 |
Fracture mechanism of G550 channel cold-formed steel under impact load |
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| ZHANG Ziling,CEN Zhibo,JIANG Lei,LI Baishu,WANG Jiawei,ZHANG Hao,ZHU Jue.Fracture mechanism of G550 channel cold-formed steel under impact load[J].Journal of Ningbo University(Natural Science and Engineering Edition),2022,35(1):90-97. |
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| Authors: | ZHANG Ziling CEN Zhibo JIANG Lei LI Baishu WANG Jiawei ZHANG Hao ZHU Jue |
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| Affiliation: | 1.Key Laboratory of Impact and Safety Engineering of Ministry of Education, Ningbo University, Ningbo 315211, China; 2.Ningbo Special Equipment Inspection and Research Institute, Ningbo 315048, China |
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| Abstract: | Using G550 channel cold-formed steel members, the Johnson-Cook constitutive model parameters and the Johnson-Cook failure model parameters are determined through the material tensile experiments and numerical simulations under different strain rates. The whole process of tearing failure of channel cold-formed steel members under different impact loads is simulated by ABAQUS software. The axial impact test of the drop hammer device is used for comparison, and the experimental results are in good agreement with the finite element numerical simulation results. In addition, the fracture mechanism of a piece of sample at the tear fracture region is analyzed by microscopic morphology. The results show that with the increase of the impact speed, the loading time of the impact force on the component increases, and the component requires greater plastic deformation to absorb the impact energy. The higher the impact speed, the greater the proportion of the crack growth work to the impact energy, which shows that the ability to prevent crack propagation at high speed is better. When the impact speed is high, brittle fracture is the main cause, during which cleavage surface appears in the fracture surface, and even adiabatic shear failure occurs during deformation. |
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| Keywords: | cold-formed steel Johnson-Cook model finite element simulation tear plastic deformation |
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