| 摘要: |
| 采用非接触式光学应变测试系统，跟踪测试了2 060 MPa级高强钢丝试件在20~900 ℃下的全过程应力-应变曲线，建立了高温钢丝各力学性能指标的高温函数模型，得到其高温破断参数.结果表明：高温下高强钢丝试件的各力学性能指标均有不同程度折损.当温度低于200 ℃时，试件的力学性能指标折损率不超过10%，破断模式为脆性破坏；当温度超过200 ℃后，试件的各力学性能指标折损率显著增大，破断模式逐渐由脆性破坏转变为塑性破坏. |
| 关键词: 高强钢丝 应力-应变曲线 高温 力学性能指标 折损程度 破断模式 |
| DOI：10.3969/j.issn.1007-9629.2024.03.006 |
| 分类号:U444 |
| 基金项目:国家自然科学基金资助项目（51178396）；防灾减灾湖北省重点实验室（三峡大学）开放基金资助项目（2023KJZ21）；广东省基础与应用基础研究基金资助项目（2022A1515110289） |
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| Mechanical Properties and Fracture Mode of 2 060 MPa Grade High-Strength Steel Wire at High-Temperature |
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CHEN Wei1, SHEN Ruili1,2, BAI Lunhua3, QI Dongchun1, YANG Jun1
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1.Hubei Key Laboratory of Disaster Prevention and Mitigation （China Three Gorges University）， China Three Gorges University， Yichang 443002， China;2.School of Civil Engineering， Southwest Jiaotong University， Chengdu 610031， China;3.School of Transportation， Civil Engineering & Architecture， Foshan University， Foshan 528225， China
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| Abstract: |
| The non-contact optical strain testing system was used to track and test the stress-strain curves of 2 060 MPa grade high-strength steel wire specimens throughout the entire process at 20-900 ℃. The mechanical performance index at high-temperature was determined， and the high-temperature fracture parameters of high-strength steel wire were obtained. The results indicate that the mechanical properties of high-strength steel wire specimens suffer various degrees of impairment at high-temperature. When the temperature does not exceed 200 ℃， the degradation of each mechanical property index of specimen shall not exceed 10%， and the fracture mode is brittle failure. After the temperature exceeds 200 ℃， the degradation of each mechanical property index of specimen significantly increases， and the fracture mode gradually changes from brittle failure to plastic failure. |
| Key words: high-strength steel wire stress-strain curve high-temperature mechanical performance index degree of impairment fracture mode |
