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对Hy-80和Hy-130钢以及它们的焊缝金属的动态断裂韧性参数下限值作出了鉴定。报道了直接测定得来的特定参数K_(1d)和K_(1m),并一并报道了由大量的夏比能量、零塑性转变温度以及动态撕裂能测量值而估计得来的K_(1d)和K_(1m)。着重点在于:在船舶结构中,在30°F——最低的预定服役温度条件下,采用弹性动态分析方法,确定裂纹增长的起始、扩展和终止的下限值。在上述这些条件下,业已发现Hy-80钢的K_(1d)/αy比值大约等于2in~(1/2),而在同样条件下,Hy-130钢以及Hy-80和Hy-130的焊缝金属的K_(1d)/αy比值大约是1in~(1/2)。可见,Hy-8O板材在动载条件下的抗断能力显然比其它三个等级的受检材料要高得多。
The lower limits of dynamic fracture toughness parameters for Hy-80 and Hy-130 steels and their weld metals were identified. The specific K_ (1d) and K_ (1m) directly measured data were reported and K_ (1d) estimated from a large number of Charpy energy, zero plastic transition temperature and dynamic tearing energy ) And K_ (1m). The emphasis is on determining the lower limit of initiation, propagation and termination of crack growth in a ship structure using the elastic dynamic analysis at a minimum service temperature of 30 ° F. Under the above conditions, it has been found that the K_ (1d) / αy ratio of Hy-80 steel is approximately equal to 2in ~ (1/2), while under the same conditions, Hy-130 steel and Hy-80 and Hy-130 The metal K_ (1d) / αy ratio is about 1in ~ (1/2). Visible, Hy-8O plate under dynamic load resistance is obviously higher than the other three levels of the test material is much higher.