We normally use the punch or hydraulic machine to expand the steel tube, but since the impetus and velocity is difficult to control, the cracking rate of expanding the steel tube reaches to over 10%.
钢管扩管通常采用冲床或液压机来加工，但由于冲力和速度难以控制，扩管破裂率达10%以上。
But the harder the economy works to repair the weak-dollar damage from the bottomless liquidity punch bowl of 2004, the deeper the urge for the 'hair of the dog' medicine of more rate cuts.
但美国经济越是想努力补救2004年“无底洞”似的流动性问题造成的美元走软，就越是迫切需要进行更多的减息。
Maximal crack displacement increases with the increase of strain rate sensitivity, and is independent on punch velocity and viscosity.
最大破裂位移仅随应变速率敏感系数的增大而增大，而与压头速度和粘度的大小无关。
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