Fatigue Strength of Age-Hardened &amp; Extruded Al Alloy under High Humidity : Rotating Bending and Ultrasonic Loading

Kawagoishi, Norio; Fukudome, Takuro; Kariya, Kohji; Chen, Qiang; Goto, Masahiro

doi:10.1299/kikaia.76.1651

Cited by 18 publications

(3 citation statements)

References 15 publications

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“…It is very necessary to further study on fatigue strength and fracture mechanics of BDF devices because those were affected by many factors such as raw materials, temperature and humidity and so on during practical application [17][18][19][20]. Therefore, the decrease of fatigue strength caused by dissolved water in BDF must be considered when engineers design new Bio-diesel Fuel equipment.…”

Section: Resultsmentioning

confidence: 99%

Fatigue Strength of Al Cast Alloy in Bio-Diesel Fuel

Yan

Hayashi

Kinoshita

et al. 2013

AMM

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In order to investigate the effect of bio-diesel fuel (BDF) on fatigue strength of a squeeze cast Al alloy, AC4CH-T6, rotating bending fatigue tests were carried out using plain specimens in BDF made by rapeseed oil. The results were compared with those in turbine oil and in ambient air. Fatigue life was longer in turbine oil and shorter in BDF than that in ambient air. Fatigue life in each environment tested was mainly occupied by the growth life of a crack smaller than 1mm, meaning that the difference in fatigue strength affected by environment was mainly yielded in the growth process of a small crack. The crack growth rates were suppressed in turbine oil and accelerated in BDF in comparison with those in air. BDF contained much water dissolved from air in the early stage of fatigue process. The suppression of crack growth was caused by wedging effect of oil and the acceleration was caused by corrosion due to dissolved water in BDF, which was larger than the suppression due to the wedging effect.

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Section: Resultsmentioning

confidence: 99%

Fatigue Strength of Al Cast Alloy in Bio-Diesel Fuel

Yan

Hayashi

Kinoshita

et al. 2013

AMM

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“…In ultrasonic fatigue, a pulse-pause test with times of 1s and 5s was carried out to reduce the temperature rise under high frequency. The humidity tested was selected by considering the daily humidity in use and the fact that the effect of humidity was significant above 60-70% 3 . The deviation of humidity was RH±5% and the temperature during tests was 25±5℃ without control.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

EFFECT OF TEXTURE ON FATIGUE PROPERTIES OF AGE-HARDENED Al ALLOYS UNDER ULTRASONIC LOADING

Matsusako

Kariya²,

Kawagoishi

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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Effects of texture and loading frequency on the fatigue crack growth behavior of an extruded and a drawn Al alloys of 2017-T4 were investigated under ultrasonic loading frequency (20kHz) in the relative humidity of 25% and 85%, respectively. The extruded alloy has a marked texture of (111) orientation, but this specified orientation is not observed in the drawn alloy. Most of fatigue life was occupied by the growth life of small cracks in the both alloys regardless of humidity. In the low humidity, crack growth was retarded at about 0.3 mm in length in the both alloys. Although crack growth was accelerated by high humidity in the early growth process, there was no or little influence of humidity on the growth rate of cracks over about 0.3 mm in the both alloys. After the retardation of crack growth, fracture surfaces featured with many slip planes in the extruded alloy and many facets in the drawn one, respectively. The difference in growth mechanism between short cracks (<0.3 mm) and longer ones (>0.3 mm) was caused by the environment at crack tips due to high crack growth rate under ultrasonic loading, and that between the both alloys was related to the degree of texture.

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“…The deviation of humidity was RH±5% and the environmental temperature was not controlled, but it was 25±5℃. Humidity tested was selected in considering that the effect of humidity on fatigue strength was largely changed around 60-70% 3,4 . Fig.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

EFFECT OF MICROSTRUCTURE ON FATIGUE PROPERTIES OF Al ALLOYS

Higashi

Kariya²,

Kawagoishi

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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Effects of a texture and atmospheric moisture on fatigue properties of an extruded bar and a drawn one of age-hardened Al alloy were investigated under rotating bending in relative humidity of 25% and 85%. The extruded alloy had a marked texture of (111) plane, but the drawn one did not have a specified orientation. Fatigue strength was largely decreased by high humidity in both alloys. The decrease in fatigue strength was larger in the extruded alloy than in the drawn one. Macroscopic growth mode of a crack of the extruded alloy was a shear mode inclined 35° to the specimen axis in high humidity, though those were a tensile mode in low humidity and in both humidity in the drawn alloy. The fracture surface yielded by the shear mode crack was occupied by many slip planes and voids and was (100) plane, though the fracture surface formed by the growth of a tensile mode crack was mainly covered with striations. The shear mode crack was related to the marked texture of the extruded Al alloy and promoted by high humidity.

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Fatigue Strength of Age-Hardened & Extruded Al Alloy under High Humidity : Rotating Bending and Ultrasonic Loading

Cited by 18 publications

References 15 publications

Fatigue Strength of Al Cast Alloy in Bio-Diesel Fuel

Fatigue Strength of Al Cast Alloy in Bio-Diesel Fuel

EFFECT OF TEXTURE ON FATIGUE PROPERTIES OF AGE-HARDENED Al ALLOYS UNDER ULTRASONIC LOADING

EFFECT OF MICROSTRUCTURE ON FATIGUE PROPERTIES OF Al ALLOYS

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