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摘要：
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本文根据材料单向拉伸失稳过程的实测结果,提出同时考虑板材性能和受拉板材的几何因素——初始断面差等两方面影响的失稳理论观点,并且也提出了拉伸失稳时的极限应变值的计算方法与公式。
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Based on the experimental results of the uniaxial tension test of sheet metal,a calculation method and formula is proposed in this paper to determine the limit strain of tesion instability. Two factors have been taken into consideration. the specific energy and the geometrical factor-the intial fluctuation of cross sections.
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基金项目：
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作者简介：
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参考文献：
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1． H.W. Swift: Journal of the Mechanics and Physics of Solids No 1 1950
2． 1972
3． R. Hill: Journal of the Mechanics and Physics of Solids No 1 1950
4． 姜奎华 冲压成形破裂极限的实验研究 锻压技术 1982． 3
5． 胡世光 板料冷压成形原理 国防工业出版社 1979
6． 李志刚等 对各向异性材料成形极限曲线的研究 锻压技术 1982． 4
7． 小森田治、吉田清太等 理研报告 vol.45 №6 1969
8． Marciniak Z. Kuczynski. K: Limit Strains in the Processes of Stretch forming Sheet Metal. Int. J. Mech si 1967
9． Vladimir Hasck: Peter Metzger Usefulness of the Theories of Necking and Inhomogeneity of the Meterial in the Description of the Forming Limit Diagram
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