2060 MPa级高强钢丝高温力学性能及破断模式  

Mechanical Properties and Fracture Mode of 2060 MPa Grade High-Strength Steel Wire at High-Temperature

作　　者：陈巍 沈锐利 白伦华[3] 齐东春 杨俊 CHEN Wei;SHEN Ruili;BAI Lunhua;QI Dongchun;YANG Jun(Hubei Key Laboratory of Disaster Prevention and Mitigation(China Three Gorges University),China ThreeGorges University,Yichang 443002,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Transportation,Civil Engineering&Architecture,Foshan University,Foshan 528225,China)

机构地区：[1]三峡大学防灾减灾湖北省重点实验室(三峡大学),湖北宜昌443002 [2]西南交通大学土木工程学院,四川成都610031 [3]佛山科学技术学院交通与土木建筑学院,广东佛山528225

出　　处：《建筑材料学报》2024年第3期230-236,共7页Journal of Building Materials

基　　金：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)。

摘　　要：采用非接触式光学应变测试系统,跟踪测试了2060 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.The non-contact optical strain testing system was used to track and test the stress-strain curves of 2060 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.

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 

分 类 号：U444[建筑科学—桥梁与隧道工程]