研究表明，用多个扇形模具块对焊管端口进行机械扩径时，椭圆管坯的塑性变形具有显著的局部特性，且主要集中于悬空段。
The study shows that plastic deformation of the elliptical tube which has a significant local characteristic mainly concentrates in the vacant section, when expanding using several expanding punches.
文中给出了无限平板带椭圆孔又受集中力和力偶时的弹性分析。
This paper gives an elastic analysis for an infinite plate weakened by an elliptical hole and being applied by concentrated forces and force couples.
研究了开椭圆孔有限板的应力集中问题。
The paper studies the stress concentration of finite plates containing multiple large holes.
试验和计算的结果表明：弹性角隅的应力集中系数比椭圆弧角隅降低15%左右。
According to results of tests and calculations, it is shown that the stress concentration coefficient of elastic corner is less about 15% than the ellipse arc corner.
点击直接选择工具（A），将注意力集中在最上面那组椭圆。
Now grab the Direct Selection Tool (A) and focus your attention on the most top set of ellipses.
点击直接选择工具（A），将注意力集中在最上面那组椭圆。
Now grab the Direct Selection Tool (A) and focus your attention on the most top set of ellipses.
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