Toribio Jesús, Matos Juan-Carlos, González Beatriz
Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL), E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain.
Materials (Basel). 2017 Apr 22;10(4):439. doi: 10.3390/ma10040439.
In this paper, a Paris law-based model is presented whereby crack propagation occurs under cyclic loading in air () and in an aggressive environment () for the case of corner cracks (with a wide range of aspect ratios in the matter of the initial cracks) in finite-thickness plates of 316L austenitic stainless steel subjected to tension, bending, or combined (tension + bending) loading. Results show that the cracks tend during their growth towards a , exhibiting aspect ratios slightly lower than unity only for the case of very shallow cracks, and diminishing as the crack grows (increasing the relative crack depth)-more intensely in the case of bending than in the case of tension (the mixed loading tension/bending representing an intermediate case). In addition, the crack aspect ratios during fatigue propagation evolution are lower in fatigue (in air) than in corrosion-fatigue (in aggressive environment).
本文提出了一种基于巴黎定律的模型，据此研究了在空气（）和侵蚀性环境（）中，316L奥氏体不锈钢有限厚度板材在拉伸、弯曲或组合（拉伸+弯曲）载荷作用下，角部裂纹（初始裂纹的长宽比范围很广）在循环载荷作用下的裂纹扩展情况。结果表明，裂纹在扩展过程中趋于形成一个，仅在非常浅的裂纹情况下，其长宽比略低于1，并且随着裂纹扩展（相对裂纹深度增加）而减小——在弯曲情况下比在拉伸情况下减小得更剧烈（拉伸/弯曲混合载荷代表中间情况）。此外，疲劳扩展过程中的裂纹长宽比在疲劳（在空气中）时比在腐蚀疲劳（在侵蚀性环境中）时更低。
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