实验结果表明，当撞击速度较低时，弹体头部发生镦粗变形；
The results show that, with a relatively low impacting velocity, plastic deformations occur at the noses of the projectiles;
镦粗变形是大型饼类锻件的主要成形方式，夹杂性缺陷是其主要质量问题。
The upsetting deformation is the main forming mode for heavy disk forgings and the inclusion defects is the main quality issue.
用广义ubet方法分析了烧结钢圆环光滑平板镦粗变形，并作了实验验证。
The general UBET is applied to analyze deformation of sintered steel ring is smooth plate upsetting, and theoretical calculations are compared to experimental results.
在镦粗变形中金属的流动行为不仅影响变形抗力的大小，而且会影响变形工艺设计的准确性。
The flow behavior of metal during the upsetting will affect not only its resistance to deformation but also its accuracy of designed deformation process.
结果表明：烧结体的镦粗变形规律与致密体相同。指出了曲柄压力机是粉末锻造工艺的最佳设备。
The results show that the upsetting deformation law of sintered preform is alike with the compact body, and the crank press is the best equipment of powder forging technology.
结果表明，硬度实验类似于压缩实验中的镦粗，硬度计压头可使金属基体发生塑性变形及粘性流动。
It demonstrated that the experiment of hardness is likely to upset in the experiment of compression. Hardness tester indenter make matrix metal plastic deformation and viscous flow happen.
结果表明：与一般镦粗成形相比，扭压成形具有可促使变形均匀、增加变形量等优点。
The results show that compared with upsetting, twist-compression forming can increase the plastic deformation, make deformation uniform, and improve the quality of forgings.
本文用常温云纹法与数值模拟法研究了筒体锻件整体镦粗与局部镦粗工艺的变形规律，得到了整体镦粗工艺的坯料尺寸图。
The deformation law of both solid and local upsetting processes for cylinder forging is investigated by moire method at room temperature and numerical simulation in this paper.
以圆柱坯热镦粗和方条料热拔长问题为例，论述了该方法在刚塑性变形分析中的应用。
It was discussed in the paper that the method applied to the analysis of rigidly plastic deformation through examples of upsetting a cylindrical billet and drawing a square...
以圆柱坯热镦粗和方条料热拔长问题为例，论述了该方法在刚塑性变形分析中的应用。
It was discussed in the paper that the method applied to the analysis of rigidly plastic deformation through examples of upsetting a cylindrical billet and drawing a square...
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