Effect of Viscosity of an Oil Environment on Fatigue Crack Growth Rate in AISI 316 Stainless Steel

Bae, Kyoo-Sik; Conrad, H.

doi:10.1016/b978-0-08-034341-9.50185-6

Cited by 3 publications

(3 citation statements)

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“…Figure 8A shows the results of Tzou et al 61 have studied the effect of viscous fluids (silicon oils) of various viscosities, in the wake of a crack on 2.25Cr‐1Mo steels shows that crack growth threshold ΔK th changed less than 1.0 MPa(m) 1/2 and the data lie close to the inert He. Bae and Conrad 62 conducted similar experiments on AISI 316 stainless steel FCG using silicone oil and found that the overall FCG results were not affected by viscous oil in the wake of a fatigue crack (Figure 8B). AISI 316 stainless steel is a planar slip alloy with a nonlinear branched crack.…”

Section: On Oxide‐induced Crack Closurementioning

confidence: 86%

“…In their model, fracture surface roughness is idealized to be of triangular cross section and roughly equal in size in terms of height (h) and width (w) (Figure 9). Based on their geometrical considerations, they derived the following relationship for the first contact of fracture surfaces during unloading F I G U R E 8 Effects of silicone oil viscosity on fatigue crack growth rate in (A) 2.25Cr-1Mo steel (50 Hz) 61 and (B) 316 stainless steel (4 Hz) 62 . Results compared with dry He and air in (A) and (B), respectively.…”

Section: On Roughness-induced Crack Closure (Ricc)mentioning

confidence: 99%

“…Effects of silicone oil viscosity on fatigue crack growth rate in (A) 2.25Cr‐1Mo steel (50 Hz) 61 and (B) 316 stainless steel (4 Hz) 62 . Results compared with dry He and air in (A) and (B), respectively.…”

Section: On Oxide‐induced Crack Closurementioning

confidence: 99%

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On 50 years of fatigue crack closure dispute

Kujawski

Ricker

Sadananda

2023

Fatigue Fract Eng Mat Struct

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In this article, we examine the 50 years of observations and interpretations into the subject of fatigue crack closure in lab air and aqueous solutions: disputes and implications. Over this period, several closure concepts have been invoked to explain why the crack propagation threshold ΔKth should reduce with load ratio R. Among these, three types are the most popular and these are closure induced by crack (i) plasticity (PICC), (ii) oxides (OICC), and (iii) roughness (RICC). Therefore, these three and their role in shielding the fatigue crack tip are critically examined. This analysis finds that the reduction in ΔKth with increasing R‐ratio in lab air and aqueous solutions is weakly linked to decreasing crack closure behind the crack tip but strongly related to the access of the environment to the crack tip region and its influence on fatigue damage at and ahead of the crack tip. Supporting evidence for this interpretation comes from the lack of ΔKth dependence on R in a good vacuum (with partial pressure of 10−5 Pa or less). In chemical environments, our viewpoint is supported by a critical analysis of corrosion processes that found that there is insufficient time for most metallic species to form ions, hydrolyze, and transform into hard phases at the crack tip before closure. Therefore, when closure occurs at the crack tip, most of the oxidized metallic species will exist as aquo‐complexes, gel, or colloids that have insufficient shear strength to wedge crack faces during unloading.

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Section: On Oxide‐induced Crack Closurementioning

confidence: 86%

Section: On Roughness-induced Crack Closure (Ricc)mentioning

confidence: 99%