Journal of the Society of Materials Science, Japan

Several Problems in Machining Plastics

A. Kobayashi

1966 Volume 15 Issue 154 Pages 467-482
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.467

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Representation of Program Fatigue Test Results

M. Seki

1966 Volume 15 Issue 154 Pages 483-486
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.483

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Study on the Fatigue Strength of Roller-Chain Link Plate

On the Effects of Link Plate Form, Shot Peened and Finished Hole

M. Nakagome

1966 Volume 15 Issue 154 Pages 487-491
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.487

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The Effects of Shot-Peening on the Fatigue Strengths of 7075 and 7076 Aluminium Alloys

K. Takeuchi, K. Sasaki, H. Yamamori

1966 Volume 15 Issue 154 Pages 492-498
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.492

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Axial Fatigue on Carbon Steel in the Plastic Range

Zenji ANDO, Norihiko NAKANO, Yozo KATO, Motohisa HIROSE

1966 Volume 15 Issue 154 Pages 499-506
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.499

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The following is the report of axial fatigue tests carried out in the plastic range on smoothed specimens with uneven cross section of 0.29% carbon steel. In the completely reversed and pulsating straining tests and the completely reversed stressing tests, we made investigations of the fatigue lives and the variations of stress-strain hysteresis curves during the fatigue tests. Measuring the diametral changes on the minimum cross sectional portion of the specimens, we dealt with the results of the experiment in true stress and true strain. Since the smoothed specimens with uneven cross section did not present buckling even under high compression strain, it was possible to make tests over the wide range of strain amplitude. For the sake of comparison completely reversed straining tests were made on smoothed specimens with uniform cross section.
The main results of the experiment are as follows.
(1) The relations between the true strain amplitude and the number of cycles to fracture are expressed in the following formulas.
(a) For the completely reversed and pulsating straining tests on smoothed specimens with uneven cross section, ε_taN^0.51=0.41
(b) For the completely reversed straining tests on smoothed specimens with uniform cross section, ε_taN^0.41=0.16
(2) The fatigue life of smoothed specimens with uneven cross section is longer than that with uniform cross section in the completely reversed straining tests. The larger the strain amplitude is, the greater the difference of the lives is.
(3) Two types of fractures were observed in the completely reversed stressing tests, contracted fracture in tests with the fatigue life of less than about 100 cycles and fatigue fracture in tests with the fatigue life of above as many cycles.

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Fatigue Strength of Welded Joints at Low Temperature

Hisashi OUCHIDA

1966 Volume 15 Issue 154 Pages 507-511
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.507

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This report is to present data for the effects of low temperature on the fatigue behaviors of welded joints of killed steel SM41, high tension steel HT50 and austenite stainless steel SUS27. Fatigue tests were carried out on plain and V-notched specimens having theoretical stress concentration factor 2 under direct cyclic stress in the temperature range of room temperature to -55°C.
The results obtained are summarized as follows:
(1) The fatigue strength of welded joints of various steels increases with the decrease of testing temperature: the increasing ratio of fatigue strength in SM41 is larger in plain specimens than that in notched specimens, on the contrary the ratio in SUS27 is larger in notched specimens than that in plain specimens and that in HT50 is nearly equal in both specimens.
(2) The fatigue strength of joints welded with different kind of steel is nearly equal to that of weaker joints welded with the same kind of steel, because the fatigue failure occurred at the heat affected zone of steel having lower fatigue strength.
(3) The fatigue strength reduction factor of SM41 increases with the decrease of temperature and that of HT50 scarcely varies. On the contrary the factor of SUS27 decreases with the decrease of temperature and SUS27 steel has the smallest reduction factor.
(4) The variation of fatigue strength reduction factor seems to be affected by the variation of yield ratio with the decrease of testing temperature.
(5) The variation of fatigue ratio with the decrease of temperature is different in various steels: the ratio in SM41 increases with the decrease of temperature, but that in SUS27 decreases. In HT50 the fatigue ratio is scarcely affected by the testing temperature.

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On the Aging of Al-3.5% Cu Alloy under the Cyclic Loads

Yoshitsugu AMANO

1966 Volume 15 Issue 154 Pages 512-516
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.512

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A study has been made of the aging behavior of Al-3.5% Cu Alloy through X-ray and metallographic observations and hardness test when aged at the temperature 175∼200°C under cyclic loads. When the plastic region is subjected to aging process under the cyclic loads the degree of age hardening is greater than that of ordinary aging and fine precipitates are observed in the cyclic loaded portion. The time required to attain maximum hardness is far shorter than that for ordinary aging. But if the strain rate exceeds a certain amount and fatigue effect become predominant, further age hardening will be inhibited.
The aging of elastic or slightly plastic deformation under cyclic loads accelerates the relief of internal strain.
From these results it is concluded that the diffusion rate of solute atoms depend on the cyclic strain rate, and that the degree of age hardening is much more remarkable when precipitation takes place in the region of laminar slip under the cyclic load.

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Reduction of Aluminium Titanate

Masanaga KUNUGI, Akio KONISHI, Seishiro FUKUTANI

1966 Volume 15 Issue 154 Pages 517-520
Published: July 15, 1966
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.15.517

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The reduction of aluminium titanate (Al₂TiO₅) heated at various temperature in the range of 1000∼1500°C in the reducing atmosphere containing hydrogene has been studied by the methods of X-ray analysis, differential thermal analysis and thermogravimetric analysis.
The aluminium titanate was prepared by heating Al₂O₃-TiO₂ compacts in air at 1550°C for three hours.
As shown in Fig. 3, the X-ray patterns of Al₂TiO₅ heated at different temperatures under the reducing atmosphere containing hydrogene have shown an observable shift in the (33.0) line and the evidence of α-Al₂O₃.
From the relation between the d value or density of the product formed by the reduction of Al₂TiO₅ and the extent x of solid solution, it is seen that the product is a solid solution such as {(1-x)Al₂O₃+xTi₂O₃}·TiO₂.

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