CAJ | 학술논문

　　孪生诱发塑性（twinning induced plasticity ，TWIP）钢作为一种具有高强韧性的先进钢铁材料，鲜有文献报道其用于膨胀管的膨胀力学有限元分析．为了获得 TWIP钢膨胀管的膨胀过程及膨胀后的力学状态、不同壁厚TWIP钢膨胀套管的理论膨胀极限及壁厚对其膨胀的影响，采用ANSYS有限元分析技术建立了可膨胀套管膨胀过程的力学模型，以TWIP钢作为套管的膨胀模型对象，对不同壁厚的矱219.075 mm实体膨胀套管在25℃时的不同膨胀率的膨胀过程进行了有限元分析．分析结果表明：壁厚对膨胀前后套管最大等效应力分布的影响不大；不同壁厚膨胀套管膨胀后残余应力沿轴向的分布规律基本一致，残余应力的峰值随膨胀套管壁厚的增加而略有上升；相同壁厚的TWIP钢理论膨胀极限较传统膨胀管用钢大5％～10％．从分析结果可以得出，大膨胀率膨胀管用TWIP钢较其他传统膨胀管用钢（J55钢等）具有较大的优势，因此对TWIP钢膨胀管力学有限元分析具有重要的意义．
　　련생유발소성（twinning induced plasticity ，TWIP）강작위일충구유고강인성적선진강철재료，선유문헌보도기용우팽창관적팽창역학유한원분석．위료획득 TWIP강팽창관적팽창과정급팽창후적역학상태、불동벽후TWIP강팽창투관적이론팽창겁한급벽후대기팽창적영향，채용ANSYS유한원분석기술건립료가팽창투관팽창과정적역학모형，이TWIP강작위투관적팽창모형대상，대불동벽후적확219.075 mm실체팽창투관재25℃시적불동팽창솔적팽창과정진행료유한원분석．분석결과표명：벽후대팽창전후투관최대등효응력분포적영향불대；불동벽후팽창투관팽창후잔여응력연축향적분포규률기본일치，잔여응력적봉치수팽창투관벽후적증가이략유상승；상동벽후적TWIP강이론팽창겁한교전통팽창관용강대5％～10％．종분석결과가이득출，대팽창솔팽창관용TWIP강교기타전통팽창관용강（J55강등）구유교대적우세，인차대TWIP강팽창관역학유한원분석구유중요적의의．
As an advanced steel materials with high strength and toughness ,the finite element a-nalysis of expansion mechanics of the twinning induced plasticity (TWIP) steel expandable tube had not yet reported in the literature .In order to obtain the expansion process and the mechanical status after expansion of TWIP steel expandable tube ,the theoretical expansion limit of different thickness of TWIP steel expandable casing and the influence of thickness to expansion ,a mechan-ical model to analyze expandable casing's expanding processes was built based on ANSYS finite element analysis technology .TWIP steel was considered to be a model object of expandable cas-ing ,and the expansion process of different thickness of ?219.075 mm solid expandable tube was analyzed at various expansion rates at 25 ℃ .The result shows that thickness does not have re-markable effect on the distribution of the maximum equivalent stress of the casing before and af-ter expansion .The residual stress of different thickness of expandable casing after expansion a-long the axial distribution is basically same .The peak value of residual stress increases slightly with the increasing of thickness .The theoretical expansion limit of TWIP steel is 5% to 10% lar-ger than traditional steel for expandable tube while thickness is the same .Conclusion can be drawn from the analysis results is that TWIP steel for expandable tube with large expansion rate has more advantages over traditional steel (J55 steel ,etc) for expandable tube .Therefore ,it is important to apply the finite element analysis of expansion mechanics to TWIP steel expandable tube .