Propagation of Microscopic and Macroscopic Surface Fatigue Cracks under Periodic Overstressing in Ti-6Al-4V Alloy.

和孝, 藤田; 良一, 小寺沢

doi:10.2472/jsms.42.1193

Cited by 2 publications

(3 citation statements)

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“…Strong acceleration effects in the growth of microscopically small fatigue cracks (of lengths below 200 μm) in a low‐carbon steel and a high‐carbon steel under periodic OL blocks ( N OL = 2–100) separated by 2.2 × 10 5 cycles below threshold were also reported in Ref. [135]. Fractographic analyses showed that crack growth increments during the OL blocks were larger than under CA loading at the OL level.…”

Section: Crack Closure In Plane Strain Conditionssupporting

confidence: 61%

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Load interaction effects during fatigue crack growth under variable amplitude loading—a literature review. Part II: qualitative interpretation

Skorupa

1999

Fatigue Fract Eng Mat Struct

195

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The current understanding of the underlying reasons behind the load interaction effects in fatigue crack growth under variable amplitude loading is presented. Mechanistic arguments proposed to control the load interaction phenomena are reviewed and evaluated based on their capability to qualitatively explain empirical trends in variable amplitude fatigue crack growth summarized in Part I [Fatigue Fract. Engng Mater. Struct. 1998, 21(8), 987–1006] of the present paper. Mechanisms linked to plastic straining at the crack tip enable an interpretation of the majority of the experimental results. Some observations, however, which cannot be understood in terms of plasticity‐induced crack closure, or which are even in contradiction with the crack closure approach, indicate a possible role of other factors. A general conclusion is that conditions under which various phenomena can affect variable amplitude fatigue crack growth and interactions between them are insufficiently recognized.

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Section: Crack Closure In Plane Strain Conditionssupporting

confidence: 61%

“…Hence, it was concluded in Ref. [135] that the acceleration effect was not likely to be related to the crack closure behaviour.…”

Section: Crack Closure In Plane Strain Conditionsmentioning

confidence: 99%

Load interaction effects during fatigue crack growth under variable amplitude loading—a literature review. Part II: qualitative interpretation

Skorupa

1999

Fatigue Fract Eng Mat Struct

195

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“…In this case, a better correlation was obtained in terms of the effective stress intensity range taking account of the crack closure. ( 5 ) No difference was recognized in the fracture surface morphology between the cases of different mean stress in accordance with the little difference found in crack growth acceleration.…”

Section: (4)mentioning

confidence: 74%

Acceleration of Fatigue Crack Growth Under Intermittent Overstressing With Different Mean Stress Levels

Koterazawa

Mudjijana

Qinsheng

et al. 1994

Fatigue Fract Eng Mat Struct

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Fatigue crack growth behaviour under intermittent overstressing was investigated in dry air with a low carbon steel under tension-compression and tension-tension loading with different mean stress levels. A very small number of cycles of overstress applied intermittently during a very large number of cycles of understress below threshold caused, in all cases, a significant acceleration in crack growth rate as compared to the case of steady cyclic stress. The acceleration for the case with tensile mean stresses was a little smaller than in the case without mean stress and it was related to a little higher crack closure level in the former case. Stress history in the precracking process had some effect on crack closure and, consequently, on the acceleration. A fairly good correlation was obtained between the acceleration and

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Propagation of Microscopic and Macroscopic Surface Fatigue Cracks under Periodic Overstressing in Ti-6Al-4V Alloy.

Abstract: Microscopic and macroscopic surface fatigue crack propagation studies were carried out under

Cited by 2 publications

References 0 publications

Load interaction effects during fatigue crack growth under variable amplitude loading—a literature review. Part II: qualitative interpretation

Load interaction effects during fatigue crack growth under variable amplitude loading—a literature review. Part II: qualitative interpretation

Acceleration of Fatigue Crack Growth Under Intermittent Overstressing With Different Mean Stress Levels

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