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Abstract：
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In this paper, the necessary condition for surface crack formmation during the axisymmetric forward extrusion have been derived by using the upper-bound approach. Moreover. the relationships between the surface crack formation during extrusion and reduction in area, friction factor. relative original height of billet, or land length of punch are computed. Therefore. whether the surface crack may occur can be predicted before forward extruding the lower plasticity metals. The theorical results agree well with experimental results.
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Funds：
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国家自然科学基金会资助
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AuthorIntro：
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Reference：
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[1] Avitzur B. Metal Forming: The Application of Limit Analysis. N.Y. & Basel, Marcel Dekker Inc., 1980．
[2] #12
[3] 程秀全(吴诗惇指导)。正挤压的有限元模拟。西北工业大学硕士论文,1988．
[4] 朱志文,吴诗惇。杯-杆型轴对称复合挤压上限法研究;西北工业大学学报,1985;3:(3) p307～319
[5] 吴诗惇,朱志文.复合挤压时的中心缩孔分析;第二回日-中冷间锻造论文集,东京;1987;p50～53
[6] Male A T. Cockcroft M G. A Method for the Determination of the Coefficient of Frcition of Metals under Conditions of Bulk Plastic Deformation. J.of Inst.of Metals, 1964; (93) p93．
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