Ti80合金巴东拘束试样拘束度有限元分析  

Finite Element Analysis on Restraint Intensity of Ti80 Alloy Rigid Restraint Specimen

作　　者：张亮 张孝伟 胡亚帅 许家璇 耿鹏震 Zhang Liang;Zhang Xiaowei;Hu Yashuai;Xu Jiaxuan;Geng Pengzhen(School of Mechanical and Energy Engineering,Huanghuai University,Zhumadian 463000,China)

机构地区：[1]黄淮学院机械与能源工程学院,河南驻马店463000

出　　处：《稀有金属》2021年第10期1223-1229,共7页Chinese Journal of Rare Metals

基　　金：河南省重点研发与推广专项(科技攻关)(192102210163)资助。

摘　　要：针对船用Ti80合金板材,基于弹塑性力学理论,使用ABAQUS软件对带加载块试样、简易试样和标准试样进行拘束度模拟,并对带加载块试样的拘束度进行实测。结果显示,带加载块试样拘束度模拟值与实测值误差在10%以内,有限元模拟方法较为准确。带加载块试样、简易试样的拘束度均明显高于标准试样,若使用带加载块试样和简易试样评价裂纹敏感性,结果偏保守。针对标准试样分别改变试板和底板厚度进行有限元模拟,结果表明,底板厚度为40 mm时,随着试板厚度(δ_(1))增加,拘束度(R)近似呈线性增加,拘束度拟合方程为R=23.63δ_(1)+1837.74。试板厚度为20 mm时,随着底板厚度增加,拘束度不断增加,但超过40 mm基本保持不变,对巴东拘束试样选择过厚的底板增加拘束度并无意义。Many studies have shown that there is a clear positive correlation between welding cold crack sensitivity and joint con‐straint.However,there are few studies on restraint intensity of titanium alloy rigid restraint specimens,and it is not conducive to prep‐aration work of welding.The material studied in this paper was Ti80 alloy,which was a widely used marine titanium alloy.The theoreti‐cal basis used was metallic materials elastic-plastic mechanics,and method was finite element simulation,with the purpose of explor‐ing the impact of types and sizes on restraint intensity.Firstly,the accuracy of finite element simulation was verified.The self-made equipment was used to test restraint intensity of specimen with load blocks.Small hydraulic pump was selected as load source.The load was transmitted to specimen through the load blocks.The intensity of pressure obtained from hydraulic pump piezometer multiplied by hydraulic cylinder piston area was loading force.Before and after loading,the groove root was taken pictures using digital integrated microscope respectively.The groove root distance was gained through VISTAR that was an image processing software.Hence the lateral deformation of groove root could be achieved from difference of the two measurements.The restraint intensity was equal to total loading force divided by the product of lateral deformation and groove length.The results showed that restraint intensity in groove midpoint was3944 N·(mm·mm)^(-1).As a contrast,the same specimen was analyzed using ABAQUS finite element software,and the material proper‐ty parameters were gained from experimental measurement.The results showed that restraint intensity in groove both ends were higher than central part because of closer to restraint weld seam.The restraint intensity in midpoint was 3718 N·mm^(-1)·mm^(-1).Therefore,the deviation of values obtained from simulation and actual measurement was less than 10%,the finite element simulation should be trust‐ed.Next,the restraint intensities of standard a

关 键 词：Ti80合金 巴东试样 拘束度 有限元 

分 类 号：TG4[金属学及工艺—焊接]