| 引用本文: | 徐善华,李柔,苏超,张宗星.锈损冷弯薄壁型钢材料力学性能试验[J].哈尔滨工业大学学报,2018,50(12):74.DOI:10.11918/j.issn.0367-6234.201805156 |
| XU Shanhua,LI Rou,SU Chao,ZHANG Zongxing.Mechanical property tests on cold-formed thin-walled steel materials with rust loss[J].Journal of Harbin Institute of Technology,2018,50(12):74.DOI:10.11918/j.issn.0367-6234.201805156 |
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| 摘要: |
| 为研究锈蚀对冷弯薄壁型钢材料力学性能的影响,通过对工业环境下服役9 a的冷弯薄壁C型檩条进行拉伸试验,探讨锈蚀程度、类型对其材料力学性能的影响.研究了钢材断口形态、应力-应变曲线、力学性能指标与其锈损程度、类型之间的关系,建立了锈损冷弯薄壁型钢材料本构模型.在此基础上,运用有限元方法分析比较了锈蚀对不同材料属性、不同厚度钢板力学性能的影响.结果表明:点蚀试件断口为单一的平断形式,而全面锈蚀试件断口则呈现为斜断、圆弧断或阶梯断；点蚀试件均表现为屈服平台、颈缩段消失,而全面锈蚀仅当锈蚀率达到36.14%时,屈服平台才消失；试件屈服强度、极限强度、伸长率、极限应变、弹性模量均随锈蚀程度增大而减小,当锈蚀率为36%时,强度下降36.66%,伸长率下降约70%.点蚀对延性的影响要高于全面锈蚀,锈蚀对冷弯薄壁型钢材料性能的影响要高于热轧型钢. |
| 关键词: 锈损 冷弯薄壁型钢 力学性能 本构关系 有限元分析 |
| DOI：10.11918/j.issn.0367-6234.201805156 |
| 分类号:TU511 |
| 文献标识码:A |
| 基金项目:国家十三五重点研发计划课题 (2016YFC0701305)；国家自然科学基金(51378417) |
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| Mechanical property tests on cold-formed thin-walled steel materials with rust loss |
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XU Shanhua,LI Rou,SU Chao,ZHANG Zongxing
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(School of Civil Engineering,Xi′an University of Architecture and Technology, Xi′an 710055, China)
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| Abstract: |
| The influence of different corrosion degree and type on the mechanical properties of steel was studied by tensile test of the standard specimen of the cold-formed thin-walled c-type purline with nine years of service in the industrial environment. By comparing the relationship between the mechanical properties, including the fracture morphology, stress strain curve and mechanical property index, and rust damage degree of damaged steel, the constitutive model of cold bending thin-walled steel was established, and the effect of corrosion on the mechanical properties of different materials was compared with the finite element analysis. The results show that the fracture form of the pitting specimen was a single fracture, and the overall corrosion was diversified: oblique breaking, arc breaking, and staircase break.Pitting specimens all showed the yield platform,the necking segment disappeared, and only when the corrosion rate reached 36.14%, the yield platform disappeared and the brittle fracture occurred. The yield, ultimate strength, elongation, ultimate strain, and modulus of elasticity decreased with the increase of corrosion degree. When the corrosion rate was 36%, the strength decreased about 40%, and the elongation decreased about 70%. The effect of total corrosion on strength was higher than that of pitting corrosion, and the effect of pitting on yield platform length and elongation was greater than that of total corrosion. The effect of rust on the mechanical properties of cold-formed materials was higher than that of hot rolled materials. |
| Key words: rust thin-walled cold-formed steel mechanical property constitutive relation finite element |
