应变速率对V-Nb微合金化钢筋抗震性能的影响  

Effect of strain rate on seismic properties of V-Nb microalloyed rebar

作　　者：钟仲华 曹建春[1] 周晓龙[1] 陈伟[2] 杨银辉[1] 黄敏[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]武钢集团昆明钢铁股份有限公司,云南昆明650302

出　　处：《材料热处理学报》2015年第2期108-113,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51261009);昆明理工大学校人才项目(14118575)

摘　　要：研究了V-Nb微合金高强度钢筋在应变速率范围为:1×10-5~1×10-3s-1的室温拉伸试验过程中的力学性能以及断口形貌的变化。结果显示:随着应变速率的加快,试验钢屈服强度和抗拉强度都增大,屈服强度增幅较抗拉强度小;随着应变速率的增加,断后伸长率逐渐减小,最大力下伸长率先增大后减小且变化范围不是很大;采用SEM对韧窝进行了分析显示,随着变形速率的提高,韧窝尺寸逐渐减小。The mechanical properties and fracture morphology of V-Nb microalloyed high strength rebars during tensile tests in the range of initial strain rate of 1 × 10- 5- 1 × 10- 3s- 1at room temperature were studied. The results show that the yield and tensile strength of the steel increase with the strain rate increasing,and the amplification of yield strength is smaller than that of tensile strength; with the increase of strain rate,the elongation decreases,the elongation at maximum force increases and then decreases and the scope of change is not great. By scanning electron microscopy on the dimple analyzed,fracture morphology of tensile test shows that with the improvement of strain rate the dimples size decreases.

关 键 词：V-Nb微合金化钢筋 应变速率 力学性能 抗震钢筋 韧窝 

分 类 号：TG142.1[一般工业技术—材料科学与工程]