碎片云 meaning in English

pannus

The study is unfolded as the below : first , analyze the hypervelocity impact character , particular seeing about thin plate perforation , debris cloud character , thick plate crater , double plate impact feature , and take numerical simulation for thin plate perforation . then sum up intestine and outside formulary about perforation and crater
首先,通过对超高速撞击特性进行分析,详细考察了薄板穿孔、碎片云特性、中厚板成坑及双层板的撞击特性,对薄板穿孔特性进行数值模拟,并总结了国内外一些穿孔和成坑公式。