菱形变形

This approach is base on the following idea:under not effect to the deformation of rectangular pipe,to change right angle to obtuse angle which is variant as some regular,make plain-barreled roll pass receive vertical roll shape pipe blank,and then let pipe blank entering into vertical roll pass.With continuous deformation, the difference between diagonal line of rhombus pass will be reduced to zero,finally changed into a square.

该方法的基本思路是：在不影响方矩形管变形的前提下，通过将孔型顶角由直角改为按一定规律变化的钝角，让呈卧菱形状的平辊孔型接纳呈立菱形状的管坯，接着让卧菱形状的管坯进入立菱形状的立辊孔型，随着变形的继续，逐渐缩小菱形孔型对角线之差直至为零，成为正方形。

In this paper, a stainless steel tube bugled a rhombus by internal high pressure forming was used as investigated target. According to different features of deformation, the tube has been divided into three different deformation areas and the stress-strain distribution has been analyzed at different hydroforming stages and different areas.

本文针对不锈钢管材内高压胀形出菱形形状为研究对象，根据不同的变形特征将管材划分为三个变形区域，并分析了管材在内高压成形工艺不同阶段不同区域的应力应变分布。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。