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Abstract：
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In this paper,rigid viscoplastic finite element method is used to solve the stress field of cylinder during upsetting between two flat platens.The stress height reduction curves of different initial ratios of H 0to D 0 were obtained. It was discovered: in the center of cylinder,there is two dimensional tensile stress during upsetting,and when height versus diameter ratio is about 1.0,σ r and σ θ of cylinder center turn from tensile stress to compressive stress.
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国家自然科学基金!赞助重点项目课题 (No.392 35 10 1)
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AuthorIntro：
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Reference：
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1 .刘助柏 .塑性成形新技术及力学原理 .北京 :机械工业出版社 ,1995 .
2 .KobayashiS ,AltanT .Metalformingandthefiniteele mentmethod.NewYork :Oxforduniversitypress,1989.
3.Ho LeeK .Finiteelementmeshgenerationmethods:are viewandclassification .ComputerAidedDesign ,1988,2 0 .
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