Fatigue Strength of Structural Steels in High Humidity Environment.

Haftirman,; Hattori, Shuji; Okada, Tsunenori

doi:10.1299/kikaia.61.1179

Cited by 9 publications

(4 citation statements)

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“…) Garwood et al, 1951, , , 1983, , 2002, 1979, Haftirman , 1995, Haftirman , 1996Karlinski et al, 1999, , 2001, , 2012 Fatigue strength in low humidity is nearly equal to the present results. This means that the effect of humidity on fatigue strength in the present results is negligible in comparison of fatigue strengths between RT and 673K.…”

supporting

confidence: 71%

Strengthening mechanism in fatigue of maraging steel at elevated temperature

Kawagoishi

Nakamura

Kariya

et al. 2020

Transactions of the JSME (In Japanese)

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In order to investigate fatigue properties of 18%Ni maraging steel at elevated temperature, rotating bending fatigue tests were conducted for plain and drilled specimens at room temperature (RT) and 673K in air. The specimens involved single-aged ones under an under-aging condition at 753K and double-aged ones in which the second aging was performed at 673K to the single-aged ones. Fatigue strength of the single-aged plain specimens was higher at 673K than at RT, though the static strength was inversely decreased at the elevated temperature. On the other hand, the single-aged drilled specimens exhibited nearly the same fatigue strength at both temperatures. It was found that hardness measured at RT increased with time in the single-aged plain specimens fatigued at 673K, which also appeared in the static aging at 673K. This hardness increase was considered to be attributed to precipitation hardening which might occur due to the existence of excess Mo solute atoms. On the other hand, crack observations revealed that crack initiation in the plain specimens was retarded markedly at 673K in comparison with that at RT, whereas crack propagation rate did not differ significantly between these temperatures and between the plain and drilled specimens. The marked delay of crack initiation in the plain specimens at 673K arose from the oxidation of their surfaces. It was also observed that the double-aging led to a large increase in fatigue strength at RT, but resulted in a slight increase at 673K. Based on these results, it was shown that the main reason of the increase in fatigue strength at 673K in the plain specimens was the suppression of crack initiation due to oxidation, while the increase in hardness observed at this temperature played a minor role.

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supporting

confidence: 71%

Strengthening mechanism in fatigue of maraging steel at elevated temperature

Kawagoishi

Nakamura

Kariya

et al. 2020

Transactions of the JSME (In Japanese)

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“…The probability of material defects resulting in fatigue crack increases with the specimen volume (Kocańda and Szala, 1997). The effect was proven in the experimental studies on small specimens (Furuya, 2011;Haftirman, 2009;Hirose et al, 2000) confirming that metals are sensitive to changes in the cross-section. Figure 1 shows the size effect test results for aluminum alloys.…”

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confidence: 74%

Verification of selected models of the size effect based on high-cycle fatigue testing on mini specimens made of EN AW-6063 aluminum alloy

Tomaszewski

Sempruch

Piątkowski

2014

jtam

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The study presents several cases where use of specimens with reduced overall dimensions, i.e. mini specimens in the course of fatigue tests is advantageous. The high-cycle fatigue tests based on a developed method have been performed on mini specimens and normative specimens (comparative tests). The tests have been conducted on EN AW-6063 aluminum alloy specimens. A correction coefficient determined as a result of monotonic tests and selected models of the size effect have been critically assessed based on the test results. A statistical Weibull's weakest link model and a monofractal approach based on a fractal dimension have been verified.

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“…Khashaba [8] meneliti sifat lelah dan keandalan dari GFRP komposit menggunakan mesin uji lelah lentur putar. Haftirman [9] meneliti kekuatan lelah baja pada lingkungan dengan kelembaban tinggi. Alaya [10] mengkaji pengaruh kedalaman takik ulir metris terhadap kekuatan lelah Baja Karbon Rendah.…”

Section: Tinjauan Pustakaunclassified

Pengaruh Fraksi Massa Serat Terhadap Kekuatan Fatik Material Komposit Berpenguat Serat Tandan Kosong Kelapa Sawit

et al. 2018

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The present study was investigated the effect of fiber mass fraction on the tensile and fatigue strength of oil palm fiber reinforced composite and resin as the matrix. Fatigue test has been performed by using rotary bending fatigue machine. The specimens were made by press hand lay-up with matrix to fiber mass ratio was 90:10, 80:20 and 70:30 respectively. Fracture surface of fatigue specimens have also been observed by using digital camera to knowing the failure mode. The results showed that the tensile and fatigue strength and fatigue life increased with increasing the fiber mass fraction as seen in the S-N curve. The fatigue limit was found 0.27 MPa, 0.55 MPa, and 0.82 MPa for composites with 90:10, 80:20 and 70:30 of matrix to fiber mass ratio respectively. The observed failure modes were matrix cracking, fiber debonding, and fiber breaking.

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Fatigue Strength of Structural Steels in High Humidity Environment.

Cited by 9 publications

References 0 publications

Strengthening mechanism in fatigue of maraging steel at elevated temperature

Strengthening mechanism in fatigue of maraging steel at elevated temperature

Verification of selected models of the size effect based on high-cycle fatigue testing on mini specimens made of EN AW-6063 aluminum alloy

Pengaruh Fraksi Massa Serat Terhadap Kekuatan Fatik Material Komposit Berpenguat Serat Tandan Kosong Kelapa Sawit

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