Journal of the Society of Materials Science, Japan

Committee Reports

1964 Volume 13 Issue 131 Pages 554-576
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.554

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A Review of the Researches on the Neucleation and the Propagation of Fatigue Cracks in Metals

T. Isibasi

1964 Volume 13 Issue 131 Pages 577-582
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.577

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On the Damages due to Plastic Fatigue

I. Yamaguchi

1964 Volume 13 Issue 131 Pages 583-588
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.583

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Some Basic Problems on the Thermal Fatigue of Type 347 Stainless Steel

N. Katoh

1964 Volume 13 Issue 131 Pages 589-595
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.589

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Several Results of Thermal Fatigue Tests

K. Nishioka

1964 Volume 13 Issue 131 Pages 596-598
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.596

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Cyclic Thermal Stressing Test Result and Its Application on the Hot Working Roll Steel

J. Watanabe

1964 Volume 13 Issue 131 Pages 599-601
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.599

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Some Observations on Constant Strain Fatigue and Thermal Fatigue

S. Kusumoto, M. Takeuchi

1964 Volume 13 Issue 131 Pages 602-607
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.602

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Example and Experiment on Thermal Fatigue

H. Yamanouchi

1964 Volume 13 Issue 131 Pages 608-610
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.608

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Testing Method and Actual Example of Thermal Fatigue

Properties of Thermal Cracks Produced at the Surface of Steel in Rapid Heat Cycles

T. Fujiwara

1964 Volume 13 Issue 131 Pages 611-612
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.611

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Comparison of Constant Strain Fatigue Tests by Torsion and by Tension-Compression

Sho KUSUMOTO, Mamoru TAKEUCHI

1964 Volume 13 Issue 131 Pages 613-618
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.613

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The constant strain fatigue tests by tension-compression and by torsion were carried out in room temperature with the use of 18Cr-8Ni stainless steel and mild steel cylindrical hollow specimens, in which the relations between the effective stress range, the effective strain range and the cycles to crack were studied.
No essential influence was found on these relations resulting from the difference of the two test methods, torsion and tension-compression. Similar results were obtained as to the relations between the strain range and the cycles to crack when the maximum shear strain range was used instead of the effective strain range.
The effect of the thickness of the specimens on the cycles to crack was also studied in the torsional constant strain fatigue tests in which the cycles to crack N_f were judged from the sudden reduction of the torque range. The results show that the N_f increase with the thickness of the specimens when the outer diameters were kept constant (16mm), and that the N_f of the cylindrical solid specimen is almost doubled in comparison with that of the hollow specimen of thickness 1mm under the same strain range.

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Fatigue Strength of Metals under Service Load

Fatigue Strength and Its Estimating Method in the Cas Where Mean Stresses Fluctuate Sinusoidally

Toshiro YAMADA, Shigeru KITAGAWA

1964 Volume 13 Issue 131 Pages 619-624
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.619

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As one of the investigations of fatigue strength of metals under service load, the fatigue tests have been carried out in the case where mean stresses fluctuated sinusoidally. In these cases, the fatigue age and endurance limits are reduced as compared with those in the case of constant mean stress, but they do not depend on the fluctuating speed, in spite of the difference in the rates of the speed from 5 to 420cpm.
We have been able to estimate the fatigue age and endurance limits in these cases by means of the criterion on the fatigue damage and the calculating method, which were proposed by the authors. These stress patterns are analyzed in the same way as in the case of varying stress amplitudes, and the fatigue strength in this case is possible of being estimated with the results of fatigue tests of constant mean stresses. It has been confirmed that both the results of the experiments and estimations exactly agree with each other.
If σ=H(n)is the equation of the cumulative frequency of repeated stresses, the formula of estimation of fatigue age N_t is as follows.
N_t=-n₀/m∫^n₀₀H(n)dnlog_e{1-m∫^n₀₀H(n)dn/∫^n₀₀exp[A·H(n)+D]dn}
where the constants, A, D and m are obtained from the results of fatigue tests in the case of constant mean stress, the n₀ is the cumulative number of stress cycles in one of the periods of the fluctuating mean stresses.

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Notch Effect on High Temperature Fatigue Strength of 18-8 Stainless Steel

Tadakazu SAKURAI, Jun-ichi MASAKI, Toshio KITAMOTO

1964 Volume 13 Issue 131 Pages 625-630
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.625

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In order to investigate the notch effect on the fatigue strength of 18-8 stainless steel at an elevated temperature, rotary bending fatigue tests were carried out at 450°C and room temperature, using specimens 12mm in diameter with V-type grooves of 60°, whose stress concentration factors α_k were between 2.5 and 4.0. A Wöhler type fatigue testing machine was operated at 1900rpm. The notch effect on coaxing was also investigated at 450°C.
After the tests, the microstructures and Vickers hardness of specimens not fractured after 10⁷ cycles of stresses at the respective endurance limit in each α_k were examined.
The test results were qualitatively discussed in connection with several phenomena, such as (a) the decrease of actual stresses due to yielding at the notch bottom region, (b) work hardening and (c) shortening of the distances between the slip lines accelerated by their developments and the preferential precipitations along these lines.
The main results obtained are as follows:
(1) At room temperature, the fatigue notch factor β increases as α_k increases, though β has comparatively low value close to 1. This tendency seems to be due to the decrease of actual stresses and work hardening.
(2) At 450°C, β decreases as α_k increases. This phenomenon seems to be due to the differences of the distances between the slip lines, besides the effects of actual stress decrement and work hardening.
(3) At 450°C, the pronounced increment of fatigue strength is brought about by coaxing. The upper limit seems to exist, however, concerning this increment of the endurance limit. These phenomena will be explained in the same way as in (2).

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Electronic Resonant Fatigne Testing Apparatus and Some Testing Results

Makoto KIKUKAWA, Kiyotsugu OHJI, Keizo MAEDA, Hisashi KAJITA

1964 Volume 13 Issue 131 Pages 631-638
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.631

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Resonant fatigue testing apparatus, which are applicable to wide extent of loading capacity, type of stressing, and size and shape of specimens, are newly devised and constructed. An apparatus is composed of the following five blocks arranged in a closed loop:
(1) Power amplifier (electron tube type, 5KVA or 70VA)
(2) Exciter (moving coil type, see Figs. 4 and 5)
(3) Mechanical vibrating system (composed of a test specimen, weights and sometimes springs, Figs. 2, 3 and 4)
(4) Load detecting device (strain gages or unbonded type wire strain gage accelerometers)
(5) Automatic amplitude control device (almost-zero method using an a-c-powered bridge and a carrier amplifier system).
Some results of the plane-bending tests on unnotched and notched mild steel specimens are reported, in which size of the test section of the specimens extends from 100(height)×20(breadth) mm to 4×18mm, loading capacity from 1 t-m to 0.5kg-m, and loading speed is 50-70c/s.

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Symposium Records

1964 Volume 13 Issue 131 Pages 639
Published: August 15, 1964
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.13.639

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