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Abstract：
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In this paper,author analyzes elastic plastic deformation of plate on the basis of the theory of plane curving pole in the material mechanics,and puts forward a viewpoint in which its strain neutral layer displaces toward inside when the plate comes into being big curvature elastic deformation, also deduces a formula on calculating plate bending thinning coefficient
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AuthorIntro：
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Reference：
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1 李硕本 .冲压工艺学 .北京 :机械工业出版社 ,1983.
2 肖景容 ,姜奎华 .冲压工艺学 .北京 :机械工业出版社 ,1994.
3 胡世光 .板料冷压成形原理 .北京 :国防工业出版社 ,1997.
4 刘鸿文 .材料力学 (第二版 ) ,下册 .北京 :高等教育出版社 ,1991
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