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本文叙述了作者及其合作者在潜艇耐压壳体钢低周疲劳性能研究工作中取得的进展,重点介绍了光滑板状弯曲试样的低周疲劳性能和板状弯曲加载条件下的表面裂纹扩展行为,讨论了表面裂纹扩展速率与总应变范围的关系和与塑性应变范围的关系。通过对弯曲低周疲劳表面裂纹扩展特征的研究,确立了低周疲劳表面裂纹扩展试验程序。并且通过对三种潜艇耐压壳体钢进行的表面裂纹扩展速率测定,获得了d(2c)/dN=A(ΔεT)~n的定量关系(ΔεT为总应变范围)。文中示出的低周疲劳曲线和d(2c)/dN-ΔεT曲线,可供材料研究、潜艇结构设计工作者使用。
This paper describes the progress made by the authors and their collaborators in the study of the low cycle fatigue properties of submarine pressure hull steels. The low-cycle fatigue behavior of smooth plate-like specimens and the surface cracks under plate bending load conditions are highlighted. The relationship between the rate of surface crack propagation and the total strain range and the relationship with the plastic strain range are discussed. Through the study on the crack propagation characteristics of the surface bending under low cycle fatigue, the test program of surface crack propagation on low cycle fatigue was established. And the quantitative relationship of d (2c) / dN = A (ΔεT) ~ n was obtained by measuring the surface crack propagation rate of the three submarine pressure-resistant shell steels (ΔεT is the total strain range). The low-cycle fatigue curve and the d (2c) / dN-ΔεT curve shown in this paper are available for materials research and submarine structural design workers.