总结了国产灰铸铁的抗拉强度与抗拉切口强度、抗弯强度与抗弯切口强度的试验研究结果.结果表明,不论在拉伸或弯曲载荷下,灰铸铁的切口强度约等于其抗拉强度或抗弯强度,与试件应力集中系数Kt无关.这表明灰铸铁的切口强度比,即切口强度对断裂强度之比(NSR)等于1.0,亦即灰铸铁对切口不敏感.结合灰铸铁的显微组织,简要分析了对切口不敏感的原因.
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