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Abstract：
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The approximation of the existent spring back theory is presented in this paper.Then the stress-strain relation in spring back is researched and a new spring back theory that the spring back is calculated with Unit-Load Method in Mechanics of Materials is proposed. The calculated results agree with the experimental results well. At the same time,this new theory provides a new method for analysing the spring back of workpieces with noncircular arc bending part.,
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AuthorIntro：
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Reference：
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［1］陈毓勋板材与型材弯曲回弹控制原理与方法国防工业出版社1990
［2］李硕本冲压工艺学机械工业出版社1982
［3］陈石保金属圆棒料弯曲回弹的探讨锻压技术1991（4）：38￣40
［4］苏翼林材料力学人民教育出版社1980
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