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Finite element analysis of the expansion of the twinning induced plasticity steel solid expandable tube

CAI Zhi-an,LI Chun-fu(School of Materials and Engineering,Southwest Petroleum University,Chengdu 610500,China)  
As an advanced steel materials with high strength and toughness,the finite element analysis 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 mechanical 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 casing,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 remarkable effect on the distribution of the maximum equivalent stress of the casing before and after expansion.The residual stress of different thickness of expandable casing after expansion along 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% larger 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.
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