Effect of Stress Ratio on Fatigue Properties and Propsition of Fatigue Life Evaluation Method under High Stress Ratio for Ti-6Al-4V Alloy

悦男, 竹内; 佳之, 古谷; 伸夫, 長島; 健介, 宮原; 三郎, 松岡

doi:10.1299/kikaia.70.1405

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Stress ratio conditions of 1, 0.01, and 0.5 were chosen and the tests under conditions in which the maximum stress was fixed at 0.2% proof stress [3] (hereafter referred to as the max = 0.2 test) were also performed. The fatigue test specimens had an hourglass shape with a minimum diameter of 4.5 mm, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…A modified Goodman diagram is generally used to evaluate this effect because it is simple to use and produces a safe-side evaluation in many materials. However, it has been reported that the modified Goodman line for Ti-6Al-4V alloy enters the dangerous side near R = 0 at ambient temperature [1][2][3][4]. Judging from these reports on Ti-6Al-4V alloy, it seems necessary to confirm the validity of the modified Goodman diagram for this forging, especially at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of stress ratio on high-cycle fatigue properties of Ti-6Al-4V ELI alloy forging at low temperature

Ono¹,

Yuri²,

Ogata³

et al. 2014

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Abstract. The effect of the stress ratio R (the ratio of minimum stress to maximum stress) on the high-cycle fatigue properties of Ti-6Al-4V extra-low interstitial (ELI) alloy forging was investigated at 293 and 77 K. At 293 K, the fatigue strength at 10 7 cycles exhibited deviations below the modified Goodman line in the R=0.01 and 0.5 tests. Moreover, at 77 K, larger deviations of the fatigue strength at 10 7 cycles below the modified Goodman line were confirmed in the same stress ratio conditions. The high-cycle fatigue strength of the present alloy forging exhibit an anomalous mean stress dependency at both temperatures and this dependency becomes remarkable at low temperature.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of stress ratio on high-cycle fatigue properties of Ti-6Al-4V ELI alloy forging at low temperature

Ono¹,

Yuri²,

Ogata³

et al. 2014

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

show abstract

“…Differences are also reported in hydrogen effects [41][42][43], mean stress effects [44][45][46] and size effects [47][48][49][50][51]. Figure 8 shows typical fatigue test results for hydrogen-charged specimens of low-alloy steels [42].…”

Section: The Characteristics Of Internal Fracturesmentioning

confidence: 98%

Gigacycle fatigue in high strength steels

Furuya

Hirukawa

Takeuchi

2019

Science and Technology of Advanced Materials

Self Cite

View full text Add to dashboard Cite

This paper reviews the research results to date on gigacycle fatigue caused by internal fractures in high strength steels. Firstly, accelerated fatigue testing was realized using ultrasonic fatigue testing at 20 kHz, which completes 10 9 cycles in one day, unlike the 3–4 months needed for conventional fatigue testing. Although the frequency effect was anticipated to be problematic, it proved negligible under conditions in which internal fractures occurred. Later, many unique characteristics of internal fractures were elucidated. For example, hydrogen has dramatically greater effects on internal fractures than on conventional surface fractures. Mean stress effects are more serious in titanium alloys than in high strength steels. Size effects were notable in high strength steels. These distinctive characteristics required a unique model to be able to predict gigacycle fatigue strength, which first required elucidation of its mechanisms. To this aim, the author attempted to measure the crack growth rates of small internal cracks using the beach mark method. The results revealed that the crack growth of small internal cracks controls internal fractures. In calculating the crack growth life, however, it was found that the conventional crack growth law overestimates the effects of inclusion size. To rectify this problem, a new model using a new crack growth law was proposed, which predicts more realistic fatigue life curves. As a result, predictions were derived for several grades of high strength steels.

show abstract

Effect of mean stress on fatigue properties of 1800MPa-class spring steels

Furuya

Abe

2011

Materials & Design

View full text Add to dashboard Cite

Effect of Stress Ratio on Fatigue Properties and Propsition of Fatigue Life Evaluation Method under High Stress Ratio for Ti-6Al-4V Alloy

Cited by 3 publications

References 0 publications

Effect of stress ratio on high-cycle fatigue properties of Ti-6Al-4V ELI alloy forging at low temperature

Effect of stress ratio on high-cycle fatigue properties of Ti-6Al-4V ELI alloy forging at low temperature

Gigacycle fatigue in high strength steels

Effect of mean stress on fatigue properties of 1800MPa-class spring steels

Contact Info

Product

Resources

About