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Abstract：
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Plastic-deformation theory is employed to investigate the process of pipe bending with small bending radius.In this paper,stresses in the bend,wall thickness change,shrinking rate at the tube section,deviation of neutral axis,bending moment,and flattening have been analyzed.The relatively bending radius impact on every craft parameter has been probed and provided the simple and convenient method for the calculated bending craft of pipe.
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AuthorIntro：
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Reference：
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[1]Mackenzie D,Boyle JT.A simple pipe bend element for pipingflex-ibility analysis[J].Int J Press Ves Piping 1992;51:85103.
[2]Munz D,Mattheck C.Cross-section flattening of pipe subjected tobending[J].Int J Press Ves Piping,1982,10:421 9.
[3]Kitching R.Smooth and mitred pipe bends:the stress analysisof pres-sure vessels and pressure vessel components.Interna-tional Series of Monographs in Mechanical Engineering,1970,3(7):323 333.
[4]Von Karman T.Uber die Formanderung dunnwandiger Rohre,insbe-sonders federnder Ausleichrohre[J].Z VereinesDeutsch Ingen,1911,55:1889 95.
[5]余心宏.中频压缩弯管成型研究[J].锻压机械,1997(3):35 37.
[6]王祖唐,等.金属塑性成形理论[M].北京:机械工业出版社,1992.
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