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ExExperimental and numerical studies on the prediction of bendability limit of QSTE340 welded tube in NC bending process

引用

Science China(Technological Sciences) 2012年第8期55卷 2264-2277页

作者： YANG He REN Ning ZHAN Mei ZHANG ZhiYong QIN YaTao JIANG HaoMin DIAO KeShan CHEN XinPing State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Baosteel Group Corporation Shanghai 200122China

For a low carbon steel tube with small wall factor D/t and bending radius R,the over-thinning induced localized necking is one dominant failure in tube numerical control(NC) bending process,which strongly restricts the bendability limit of the *** addition,the deterioration of bendability of a tube is increased by the existence of the weak weld ***,an important issue is how to determinate and predict the welded tube bendability *** the present study,a finite element(FE) model with weld and subdivided heat affected zones under ABAQUS platform is employed to explore the deformation behaviors of welded tube NC bending.A localized necking criterion based on the critical thickness thinning is used to predict the critical principal strains,critical bending radius and burst location during the forming *** is found that the failures always occur at the rigid supporting point of mandrel flexible balls near the tangent point at the outside of the bend,where the wall thickness of the tube is the *** bending limit curves(BLCs) of the QSTE340 welded tube are obtained by shifting the standard shaped forming limit curve to the critical principal strains along the major strain *** between the numerical and experimental results has shown that the BLC and critical bending radius predictions agree well with the experimental *** addition,the effect of weld positions on BLC is discussed,the weld region shows an almost negligible effect on the forming limit at a non-critical location that is far away from the outside of the ***,when the weld is at the large tensile deformation region on the outside of the bend,a decrease of the forming limit strains is seen.

关键词： bendability limit welded tube NC bending FE simulation critical thickness thinning

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