Stress Analysis of Bolted Flange Joint during the Service Process at High Temperature
To ascertain the stress evolution of bolted flange joint (BFJ) during the whole service process at high temperature, four stages, including pretension stage, pressure stage, temperature stage and creep stage, have been considered.The finite element method is used to calculate the stress distributions of BFJ in cach stage.These four stages are carried out one by one in a complete analysis.Firstly, the structural analyses are conducted in the pretension and pressure stages.Secondly, the thermal-structural coupled analysis is conducted in the temperature stage.Lastly, the creep analysis is conducted in the creep stage.During the creep analysis, the influence of the creep of bolt and flange to the stress of BFJ has been considered.Then, the stress distributions of gasket, fasteners and flanges in four stages under different pressures have been obtained.The results show that in the pretension stage, the stresses of gasket, bolt and flange gradually increase.In the pressure stage, the internal pressure will make the stresses of gasket, bolt and flange increase except the gasket stress under the internal pressure of 10MPa.In the temperature stage, the temperature field will make the stresses of bolt and flange increase, and the gasket stress shows little change.In the creep stage, the stress of gasket, the stress at inner side of bolt and the stress of flange will relax with creep time growth.Finally, based on the creep strain calculated, the creep damage assessment method for BFJ has been proposed.This research will provide a global perspective to understand the mechanical behavior of BFJ during the whole service process at high temperature.
bolted flange joint stress analysis service process high temperature creep stress relaxation
Xue Jilin Chen Xuedong Fan Zhichao Lv Yunrong Wang Lu
Hefei General Machinery Research Institute, National Safety Engineering Technology Research Center for Pressure Vessels and Pipeline, China,No.888 west changjiang road, Hefei 230031, China
国际会议
长沙
英文
20-26
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）