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本文对三种不同强度级的低合金钢((09Mn Ti Cu、16MnNb、WCF-62)进行了落锤 NDT 试验与夏比示波冲击系列温度试验。随着温度的降低,冲击过程中的负荷一挠度曲线在达到最大负荷(Pm)后,会出现陡降现象(POP-in),且温度越低,陡降部份(ΔP,越大。因此,可将(ΔP)/(Pm)=50%作为又一个材料脆性断裂准则—负荷准则。对于2mm 深的予裂纹冲击试样,当(ΔP)/(Pm)=50%时,其对应的温度(PTT)减去10℃与落锤NET 基本相等,即 NDT=PTT-10℃。对 NDT 与夏比冲击特性的这一关系,从ΔP 的物理意义与落锤试验和夏比予裂纹试验具有的相同之点进行了解释。
In this paper, the drop-weight NDT and the Charpy oscillographic series of temperature tests of low alloy steel (09Mn Ti Cu, 16MnNb, WCF-62) of three different strength grades were carried out. As the temperature decreased, the load A deflected curve shows a sharp drop (POP-in) after the maximum load (Pm) has been reached, and the lower the temperature, the larger the drop (ΔP). Therefore, (ΔP) / 50% as another brittle fracture criterion - load criteria For pre-cracked 2 mm deep impact specimens, the corresponding temperature (PTT) is subtracted from the drop weight at 10 ° C when (ΔP) / (Pm) = 50% NET are basically equal, ie, NDT = PTT-10 ° C. The relationship between NDT and Charpy impact properties is explained by the same point in physical meaning of ΔP as the drop-hammer test and the Charpy crack test.