工业-海岸大气环境下Q235B钢材力学性能及时变本构模型研究
姜绍飞 , 陈涛 , 宋华霖 , 王威 , 林金星 , 管文忠
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (4) : 94 -103.
工业-海岸大气环境下Q235B钢材力学性能及时变本构模型研究
Mechanical Properties and Time-Varying Constitutive Model of Q235B Steel under an Industrial-Coastal Atmospheric Environment
为揭示工业-海岸大气环境下Q235B钢材力学性能退化规律,本文开展了腐蚀试件力学性能试验,并对钢材时变本构模型和加速腐蚀时间相关性模型进行了研究。首先,通过模拟工业-海岸大气腐蚀环境,开展不同周期的腐蚀试验并对腐蚀试件进行单调拉伸试验;其次,结合试验结果提出工业-海岸大气下Q235B钢材的时变本构模型,建立数值模型并验证其有效性;最后,建立试件加速腐蚀时间与实际工业-海岸大气环境服役年限的相关性模型。结果表明,腐蚀周期的增加使钢材失效模式由延性失效转变为脆性断裂失效;屈服强度、抗拉强度、弹性模量和断后伸长率与腐蚀周期呈负相关;数值模型结果与试验应力-应变曲线两者误差小于6.5%;实验室加速腐蚀160 d等效实际环境服役54年。这些结果表明提出的钢材本构和相关性模型可用于工业-海岸大气环境下Q235B钢材力学性能的建模和评估。
In order to reveal the degradation law of mechanical properties of Q235B steel in an industrial-coastal atmospheric environment, this paper experimentally investigates the mechanical properties of corroded specimens, and develops a time-varying constitutive model and an accelerated corrosion time correlation model. Firstly, by simulating the industrial-coastal atmospheric corrosion environment, corrosion tests with different cycles were conducted and monotonic tensile tests were carried out on the corroded specimens. Secondly, a time-varying constitutive model of Q235B steel in an industrial-coastal atmosphere was proposed based on the experimental results, and a numerical model was developed to verify its effectiveness. Finally, a correlation model between the accelerated corrosion time of the specimens and the actual service life in the industrial-coastal atmospheric environment was established. The results show that the increase of corrosion cycle changes the failure mode of steel from ductile failure to brittle fracture failure. The yield strength, tensile strength, elastic modulus and elongation after fracture are negatively correlated with the corrosion cycle. The error between the numerical model results and the experimental stress-strain curves is less than 6.5%. 160 days of accelerated corrosion in laboratory is equivalent to 54 years of service in the actual environment. These findings indicate that the proposed steel constitutive and correlation models can be used for the modeling and evaluation of Q235B steel in the industrial-coastal atmospheric environment.
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“十四五”国家重点研发计划(2023YFF0906102)
国家自然科学基金(52278295)
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