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DEGRADATION LAWS OF MECHANICAL PROPERTIES FOR PROFILED STEEL SHEETS IN ACCELERATED CORROSION ENVIRONMENTS
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摘要: 通过加速腐蚀试验得到不同厚度、不同腐蚀程度的压型钢板板材试件，并根据三维表面形貌及拉伸试验结果分析表面粗糙度参数随腐蚀时间的变化规律、不同腐蚀程度试件破坏形态、应力-应变曲线差异、拉伸性能参数与腐蚀率的函数关系，建立了腐蚀压型钢板的性能退化本构模型。结果表明：试件表面粗糙度参数随腐蚀时间的增长呈阶梯状变化；随着腐蚀率的增大，试件断口形式由平滑斜断裂转变为锯齿状或阶梯状断裂，同时屈服平台、颈缩段逐步缩短，拉伸力学指标逐渐退化；所建立的退化本构模型能够较好地表征不同腐蚀程度下钢材性能的退化规律。Abstract: The profiled steel sheet specimens with different thickness and corrosion degrees were obtained by accelerated corrosion tests. Based on the three-dimensional surface forms and tensile test results, the variation law of surface roughness parameters with corrosion time, failure modes of specimens with different corrosion degrees, difference of stress-strain curves, functional relations between tensile property parameters and corrosion rates were analyzed. A constitutive model of performance degradation for profiled steel sheets was proposed. The results showed that the surface roughness parameters of specimens changed in grades with the increase of corrosion time. With the increase of corrosion rates, the fracture mode of specimens changed from smooth oblique fracture to serrated or echelon form fracture, while the yield platforms and striction sections were gradually shortened, and the tensile mechanical indexes were gradually degraded. The degraded constitutive model could well characterize the degraded law of steel properties with different corrosion degrees.
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Key words:
- corrosion /
- profiled steel sheet /
- mechanical property /
- constitutive model
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