用带有TRS-80微型机和快速A/D转换器搜集、处理信息的摆锤式冲击试验机测定30CrMnSiNi2A和300M两种超高强度钢的P-D曲线;假定在P-D曲线上柔度发生急剧变化的转折点即裂纹失稳扩展点,则由此可计算出冲击加载条件下的动态断裂韧性,计算获得K_(Ic)~D值的精确度在2％左右,可适用于工程计算。
The plot of load vs deflection (P--D) for two ultrastrength steels30CrMnSiNi2A and 300M has been examined on the Charpy machine impact tester withdigital memory and microcomputer. A criterion was found to availably represent thedynamic fracture toughness, K_(Ic)~D, of the steels under impact loading. The K_(Ic)~D can becalculated with suggesting that the discontinous shape point of the compliance onthe P--D plot is the point of destabilized crack propagation. The K_(Ic)~D of 300M steel,quenched at 870℃ and separately tempered at 300 and 450℃, was estimated to be50--70 and 54--67 MN/m~(3/2) respectively. It seems to be available, with accuracy abo-ut 20%, to the engineering evaluation.
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