不同摆锤刀刃半径对室温冲击试验结果的影响

目前的冲击试验国家标准GB/T 229-2007中规定,冲击试验时摆锤刀刃半径应为2mm和8mm两种,但采用两种不同刀刃半径进行试验后的结果会存在一定的偏差。因此采用两种不同半径的刀刃分别对同一批试样进行室温冲击试验,结果表明:8mm半径刀刃冲击后得出的冲击吸收功略大于2mm半径刀刃的冲击吸收功,但差异不是很明显;检测中必须采用正确的试验方法,选择相对应的刀刃半径,避免造成检测结果的误判;对不同材料进行冲击性能比较时,只有选用相同半径的摆锤刀刃进行检测,结果才具有可比性。

Influence of Different Striker Blade Radius on Impact Test Results under Room Temperature

The national standard GB/T 229-2007 specifies the striker blade radius can be chosen as 2 mm and 8 mm- There must be a certain difference between them. So the impact performance was tested under room tem- perature for the same samples by two kinds of different radius blade. The results showed that the impact absorption power by 8 mm radius blade was greater than by 2 mm radius blade, but the difference was not obvious. The right method and corresponding blade radius should be chosen to avoid misjudgement results. When the impact perform- ance of different materials was compared, only using the same radius blade, the results were comparable.