材料工程2017，Vol.45Issue(1)：72-77,6.DOI:10.11868/j.issn.1001-4381.2015.000312
低碳钢薄壁焊管液压胀形行为
Bulging Behavior of Thin-walled Welded Low Carbon Steel Tubes
摘要
Abstract
In order to investigate the deformation behaviour of welded tubes during hydraulic bulging process,the hydraulic bulging tests of thin-walled welded low carbon steel tubes (STKM11A) were conducted on the tube hydroformability testing unit.The thickness distribution,profiles of bulging area and the strain distribution were all obtained.Results show that the thickness reduction of weld zone is just 2.4％-5.5％ while its effective strain is just 0.05-0.10,which is very small and negligible compared with the parent material and means that just the geometric position of weld zone is changed with the continuous bulging.The thinnest points are located on the both sides of weld seam symmetrically and the angle between the thinnest point and weld seam is about 30°,at which the necking has been occurred.When the length of bulging area increases,the fracture pressure,the thickness reduction and the ultimate expansion ratio all decrease,and the profile of the bulging area gradually stcps away from the elliptical model which is powerless for the ratio of length to diameter up to 2.0.Moreover,the strain state of the tube is transformed from biaxial tension to plane strain state with the increasing length of bulging area,on the basis of this the forming limit diagram of welded STKM11A steel tubes can be established.关键词
薄壁焊管/液压胀形/长径比/变形行为/焊缝区Key words
thin-walled welded tubes/hydraulic bulging/ratio of length to diameter/deformation behavior/weld zone分类
矿业与冶金引用本文复制引用
谢文才,苑世剑..低碳钢薄壁焊管液压胀形行为[J].材料工程,2017,45(1):72-77,6.基金项目
长江学者和创新团队发展计划(IRT1229) （IRT1229）
国家自然科学基金项目(51175111) （51175111）
