盐雾预腐蚀对<strong>HRB400E</strong>抗震钢筋超低周疲劳性能的影响

doi:10.11901/1005.3093.2020.409

材料研究学报

2021, Vol. 35

Issue (2): 101-109 DOI: 10.11901/1005.3093.2020.409

研究论文

本期目录 | 过刊浏览

盐雾预腐蚀对HRB400E抗震钢筋超低周疲劳性能的影响

谌理飞¹, 罗云蓉¹(

), 张应迁², 李辉¹, 李秀兰¹, 廖文丽³

^1.四川轻化工大学机械工程学院自贡 643000
^2.四川轻化工大学土木学院自贡 643000
^3.四川轻化工大学化学工程学院自贡 643000

Effect of Pre-corrosion by Salt Spray on Extremely Low Cycle Fatigue Performance of HRB400E Seismic Steel Bar

CHEN Lifei¹, LUO Yunrong¹(

), ZHANG Yingqian², LI Hui¹, LI Xiulan¹, LIAO Wenli³

^1.College of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China
^2.College of Civil Engineering, Sichuan University of Science and Engineering, Zigong 643000, China
^3.College of Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China

引用本文:

谌理飞, 罗云蓉, 张应迁, 李辉, 李秀兰, 廖文丽. 盐雾预腐蚀对HRB400E抗震钢筋超低周疲劳性能的影响[J]. 材料研究学报, 2021, 35(2): 101-109.
Lifei CHEN, Yunrong LUO, Yingqian ZHANG, Hui LI, Xiulan LI, Wenli LIAO. Effect of Pre-corrosion by Salt Spray on Extremely Low Cycle Fatigue Performance of HRB400E Seismic Steel Bar[J]. Chinese Journal of Materials Research, 2021, 35(2): 101-109.

全文: PDF(5266 KB) HTML

摘要:

研究了盐雾预腐蚀对HRB400E钢的超低周疲劳性能影响。用NaCl溶液在盐雾腐蚀箱中对试验钢加速腐蚀30~90 d，然后采用轴向位移控制模拟强震载荷进行超低周疲劳试验，获得载荷随循环周次的变化关系和应变寿命曲线等；最后采用扫描电镜对断口形貌进行观察，分析微观断裂机理。试验结果表明：预腐蚀30、60和90 d的试验钢寿命分别下降了4.4%~10.2%、14.3%~31.8%和7.8%~30%；宏观裂纹萌生寿命占总寿命的90%，应变幅3%为超低周与低周疲劳的分界点；盐雾腐蚀对试验钢的循环响应特征与Masing特性无明显影响；断裂区呈月牙状沿着试验钢边缘断裂，较长盐雾腐蚀时间和较高应变幅会导致最后断裂区产生韧窝特征。

关键词 ：金属材料, HRB400E抗震钢筋, 盐雾预腐蚀, 超低周疲劳, 微观断裂机理

Abstract：

The effect of pre-corrosion by salt spray on the extremely-low cycle fatigue performance of HRB400E steel was studied. The steel samples were firstly subjected to salt spray corrosion with NaCl solution for 30~90 days, and then subjected to extremely-low cycle fatigue test via an axial displacement control facility to simulate the strong earthquake loading. Therewith, the relationship between the loading and cycle numbers, as well as the strain-life curves were obtained. Finally, the fracture faces were characterized by scanning electron microscope (SEM). The results show that the decline rates of life after pre-corrosion for 30 days, 60 days and 90 days were 4.4%~10.2%, 14.3%~31.8% and 7.8%~30%, respectively. The crack initiation life accounts for 90% of the total life, and the strain amplitude of 3% is the turning point between ultra-low cycle and low cycle fatigue. Salt spray corrosion has no obvious effect on the cyclic response characteristics and Masing characteristics of the test material. At last, the fracture zone was crescent-shaped along the edge of the test material. Longer salt spray corrosion time and higher strain amplitude would lead to dimples in the final fracture zone.

Key words： metallic materials HRB400E seismic steel bar salt spray pre-corrosion extremely low cycle fatigue (ELCF) microscopic fracture mechanism

收稿日期: 2020-09-28

ZTFLH:

TG142.1

基金资助:国家自然科学基金(51701133);四川省教育厅项目(16ZB0255);四川省高校重点实验室项目(2018QYJ03)

作者简介: 谌理飞，男，1995年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.409 或 https://www.cjmr.org/CN/Y2021/V35/I2/101

表1 HRB400E钢筋的化学成分(质量分数，%)

表2 HRB400E钢筋的力学性能

表3 ELCF试验结果

图1 塑性应变幅占比与总应变幅关系

图2 循环响应特征曲线

图3 最大拉伸力和压缩力随循环周次变化

图4 ELCF应变幅-寿命曲线

Corrosion time/d	$ε f'$	c	$σ f'$ /MPa	b	$k'$ /MPa	$n'$
0	0.2	-0.5	6200	-0.14	1024	0.18
30	0.22	-0.5	4400	-0.084	990	0.18
60	0.132	-0.4	4000	-0.08	1198	0.22
90	0.12	-0.37	3184	-0.037	1189	0.24

表4 ELCF参数

图5 LCF与ELCF应变幅-寿命曲线

图6 半寿命滞回环

图7 能量密度-寿命曲线

图8 断口形貌(εa=3%)

图9 最后断裂区

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