本文用弹塑性大应变问题的等参数有限元分析程序(LEPS程序)，对平板和圆棒试件的颈缩作了较全面的分析。
An isoparametric finite element program of large elastic-plastic strain (LEPS) is used to analyse the necking of a cylindrical bar and a plate specimen under uniaxial tension.
对无芯棒缩管提出了流函数的数学模型，应用上限原理加以推导和数值运算。
The paper forword a mathematical model of stream function for sinkings with no internal mandrel and applies the upper bound approach principle to make further deduction and calculation.
研究结果表明，过滤可提高铸棒的机械性能，减少夹杂、裂纹、缩松、羽毛晶等常见缺陷。
As a result, the mechanical properties of the castings were improved by filtering. The inclusions, cracks, Porosities and feathered crystals were declined.
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