The springback Angle increases with the increase of the punch round radius and clearances between the punch and the die while decreases...

回弹角随凸模圆角半径和凸凹模间隙的增大而增大，随压边力、板料厚度、摩擦系数和材料硬化指数的增大而减小。

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The results show that the sheet in the adjacent area of die and punch deforms primarily. The maximal value of stress and strain appears in the sheet of outboard punch round corners.

结果表明，凸模和凹模交界处的板料首先变形，应力及应变最大值出现在凸模圆角部位外侧板料上。

youdao

The cloud's round shape is likely what is known as a hole-punch cloud.

云的圆形很可能就是人们所称的穿洞云。

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Martinez came out with all guns blazing in the final round but Burns, roared on by an electric crowd, found the most damaging punch of the round and remained in control despite the champion catching him with a low blow, which was punished by the referee.

BBC: Ricky Burns takes world title from Roman Martinez

She was ejected from the game after throwing a round-house punch at Texas Tech's Jordan Barncastle.

NPR: No. 1 Baylor Routs Texas Tech 90-60

Burns though made a dubious start, being knocked to the canvas in the first round by a firm right hand from Martinez, the Puerto Rican's first real punch in anger.

BBC: Ricky Burns takes world title from Roman Martinez