In bulkdeformation processes such as forging, rolling, extrusion, and wire drawing there is an intentional change in the thickness or the lateral dimension of the workpiece.
大部分的变形过程如：锻造，轧制，挤压和拉丝都有同样的过程就是有意使工件的厚度或外部尺寸发生变化。
2
The study on dynamic model of block indicates that the interface effects of blocks are related with the size of block and the capability of bulkdeformation included in block and interface.
On the other hand may cause the material to have the big plastic deformation, improving material tissues, obtaining the submicron even nanometer bulk materials.