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Abstract：
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Based on the experiments,the stress-strain state along the tangential direction of outer side of tube bending and the direction of the wall thickness is analyzed and related mean strain calculating formula is also derived.According to that above mentioned,the calculating formula of minimum relative bending radius limited by tube extending rate and extending intensity is deduced.It is pointed out that the authentic mechanical function of tube materials possesses significant influence upon the approximate calculation of the tube bending formation and the minimum relative bending radius.
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Funds：
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北京市重点学科基金项目(XK00070424)
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AuthorIntro：
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Reference：
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[1]孙良金,王周树.金属弯曲实验中的力学问题[J].实用测试技术,2000,(6):31 33,6.
[2]鄂大辛,宁汝新,唐承统,阎艳.小直径管无芯弯曲壁厚变形的试验研究[J].塑性工程学报,2005,12(2):58 60,77.
[3]武世勇,石伟,刘庄.缠绕式弯管工艺对管壁厚度影响的数值分析[J].锻压技术,2002,(1):35 38.
[4]春日保男.プレス加工[M].共立出版株式会社(日本)1965.
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