摘要
该文研究了复合材料构件螺栓连接预紧力的长期性能预测。在作者前期工作的基础上,建立并完善了基于蠕变全应变理论的螺栓连接预紧力松弛预测模型。主要改进包括各蠕变阶段表达式转换为分段形式和修正时-温转换因子的作用方式两方面。采用时-温等效原理获得的长时加速表征实验数据对模型进行验证。结果表明,本模型能较好地描述预紧力长期特性,且预测效果比现有的Shivakumar-Crews模型及Hook-Norton模型更好,从而证明了该模型的准确性和可靠性。
This paper studies the long-term performance prediction for the preload of bolted composite joints.An analytical model based on the authors’previous work was improved,with transferring expressions of different creep stages into segmented forms and modified the use of time-temperature shift factor.Accelerated tests were designed and performed for characterizing the long-term relaxation behavior.Comparisons between the results of the predicted model and accelerated test results indicated that the improved model provided a better validity than existing models such as Shivakumar-Crews’s model and Hook-Norton’s model for describing the long-term preload behavior.
作者
吕佳欣
肖毅
Lü Jia-xin;XIAO Yi(School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China)
出处
《工程力学》
EI
CSCD
北大核心
2018年第10期229-237,共9页
Engineering Mechanics
基金
国家自然科学基金项目(11832014)
中央高校基本科研业务费专项资金项目(0220219105)
关键词
复合材料
螺栓连接
时-温等效原理
预紧力松弛
预测模型
加速试验
composite material
bolted joints
temperature-time dependent
preload relaxation
predicted model
accelerated test
作者简介
吕佳欣(1994―),女,山西人,硕士生,主要从事复合材料耐久性评估(E-mail:1631830@tongji.edu.cn).;通讯作者:肖毅(1960―),男,北京人,教授,博士,博导,主要从事复合材料力学、结构强度分析与设计(E-mail:y_xiao@tongji.edu.cn).
