\r李 慧，张 军，李海宇，申浩中\r
\r
AuthorsHTML:\r李 慧，张 军，李海宇，申浩中\r
\r
AuthorsListE:\rLi Hui，Zhang Jun，Li Haiyu，Shen Haozhong\r
\r
AuthorsHTMLE:\rLi Hui，Zhang Jun，Li Haiyu，Shen Haozhong\r
\r
Unit:\r郑州大学化工与能源学院，郑州 450001\r
\r
Unit_EngLish:\rSchool of Chemical Engineering and Energy，Zhengzhou University，Zhengzhou 450001，China\r
\r
Abstract_Chinese:\r通过圆柱对接试件的扭转疲劳实验，分析了平均剪应力、剪应力幅值和循环周期3 个因素对粘接结构的应变变程、应变率和疲劳寿命的影响．结果表明：平均剪应力对粘接结构的循环加载应力-应变响应影响很大．在平均剪应力非零的情况下，有棘轮应变出现，并且棘轮应变随着平均剪应力的增加而增加，棘轮应变率也随之增加；在改变剪应力幅值，而平均剪应力为零的情况下，虽然粘接试件没有出现棘轮效应，但由于循环蠕变和循环软化的原因，循环加载的应力-应变的曲线斜率随着剪应力幅值的增加出现下降的趋势，剪应力幅值增加，应变变程也随之增加，同时剪应力幅值越高应变稳定期越短；在改变循环周期情况下，应变变程影响不大，只是随着循环周期的缩短，后期的循环软化略有增加；在疲劳寿命影响方面，随着平均剪应力和剪应力幅值的增加，疲劳寿命都明显下降，但循环周期对粘接试件的扭转疲劳寿命的影响不大．\r
\r
Abstract_English:\rThe fatigue failure behaviors of adhesively bonded hollow cylindrical butt-joints were experimentally investigated. The effects of shear stress amplitude, mean shear stress, and cycle time on the strain variation response, strain rate, and fatigue life of adhesively bonded butt-joints were analyzed. Results showed that mean shear stress had a considerable influence on the stress-strain curve of cyclic loading. Ratchetting strain appeared when mean shear stress was nonzero. Ratchetting strain and ratchetting strain rate increased with the increase of mean shear stress. Ratchetting strain did not appear in the adhesive specimens when shear stress amplitude varied and the mean shear stress was zero. The slope of the stress-strain curve tended to decline with the increase of shear stress amplitude due to cyclic creep and cyclic softening. Additionally, the strain variations increased with the increase of shear stress amplitude. Meanwhile, the steady state stage of strain variations shortened as shear stress amplitude increased. However, cycle time had a negligible effect on strain variations. Softening in the later stages slightly increased as the cycle shortened. Fatigue life decreased with the increase of average shear stress and shear stress amplitude. However, cycling time had a limited effect on the torsion fatigue life of the adhesively bonded butt-joint specimens.\r
\r
Keyword_Chinese:对接粘接结构；单轴棘轮；扭转循环；疲劳寿命\r

Keywords_English:adhesively bonded butt-joints；uniaxial ratchetting；cyclic torsion；fatigue life\r


PDF全文下载地址:http://xbzrb.tju.edu.cn/#/digest?ArticleID=6275