Journal of the Society of Materials Science, Japan

Rheology of Concrete

K. Okada

1963 Volume 12 Issue 113 Pages 68-71
Published: February 15, 1963
Released on J-STAGE: August 20, 2009

DOIhttps://doi.org/10.2472/jsms.12.68

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Rheological Properties of Clay

S. Murayama

1963 Volume 12 Issue 113 Pages 72-78
Published: February 15, 1963
Released on J-STAGE: August 20, 2009

DOIhttps://doi.org/10.2472/jsms.12.72

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Effect of High Stress on Program Load Fatigue Strength

M. Seki

1963 Volume 12 Issue 113 Pages 79-83
Published: February 15, 1963
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.12.79

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On the Measurement of the Residual Stress

2nd Report; on the Method of Measurement of the Residual Stress in the Heat Treated Hollow and Solid Cylinder

Shigeru YONETANI

1963 Volume 12 Issue 113 Pages 84-92
Published: February 15, 1963
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.12.84

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The author reported, in the first report, a method of measurement of the residual stress in the heat treated solid cylinder with small diameter, consisting of the removal of surface layer of the specimen by corrosion and the measurement of the resultant changes of the length in axial direction and the specific volume of the remaining portion. In the present report, the author shows a method of measurement of the residual stress in the heat treated hollow or solid cylinder when the inner layer of the specimen is removed.
Let ₀σ_z, ₀σ_t and ₀σ_r be the residual stresses in the axial circumferential and radial direction respectively, further let ε_z and ε_v be the changes of axial strain and volume strain accompanied by removal.
Then the three stresses ₀σ_z, ₀σ_t, ₀σ_v are expressed as follows:
₀σ_z=E/1+ν{(f_b-f)d/df(ε_z+ν/1-2νε_v)-(ε_z+ν/1-2νε_v)}
₀σ_t=-E/1+ν{(f_b-f)d/df(ε_z-1/1-2νε_v)-(f_b+f)/2f(ε_z-1/1-2νε_v)}
₀σ_v=-E/1+νf_b-f/2f(ε_z-1/1-2νε_v)
where, E=Young's modulus.
ν=Poission's ratio.
f_b=Cross sectional area in the outer diameter of cylinder.
f=Removed area.
The change of volume strain ε_v is, when we put v₀ and v for the specific volume of the specimens before and after removal.
ε_v=2(1-2ν)/3(1-ν)(v-v₀)/v₀
The procedure and the actual data of measurement are explained. The effect of boring by cutting is also reported.

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On Repeated Tension Impact Tests of Butt Welded Joint Connecting Mild Steels

Yoshiki FUJIMURA, Sigeru SAITO, Michio GOTO

1963 Volume 12 Issue 113 Pages 93-98
Published: February 15, 1963
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.12.93

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In this experimental research, the authors carried out the repeated tension impact tests on butt welded joint connecting the plates of mild steels by using the universal repeated impact testing machine (Fujii type, capacity; 40∼5kg-cm, number of repetitions 600/min)
In these tests, four types of specimens in rolling direction were prepared, which were as follows: (A) Butt welded joint specimens, as-welded condition. (B) The same, reinforcement machined off. (C) The same, stress relief heat treatment. (D) Base metal specimens.
Some of the experimental results obtained are summarized as follows:
(1) The E-N curves, which show the results of the tests, plotted in normal-log scale, discontinuously change from upper curves to lower curves, without exception. The specimens fractured with large scale plastic deformation on upper curves, and with true fatigue fractured surface on lower curves.
(2) The fracture of all specimens on upper curves occurred at the parallel part of the base metal. On lower curves, the fracture of specimens at as-welded condition and of those machined off reinforcement occurred at the toe of the welded joint, while, the greater part of the heat treated specimens fractured at the fillet of the base metal, and the rest fractured at the toe of the joint.
(3) The values of impact fatigue strength at 10⁵ and 5×10⁵ cycles were estimated from the results of the tests as shown by Table 3.

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Fatigue Behaviors of 18-8 Stainless Steel under Combined Cyclic Mechanical Strain and Cyclic Heating, and also under Cyclic Strain at Elevated Temperature

Minoru KAWAMOTO, Hiroshi NAKAJIMA, Toshio NONAKA

1963 Volume 12 Issue 113 Pages 99-107
Published: February 15, 1963
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.12.99

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Cylindrical solid specimens of 18-8 stainless steel were subjected to combined temperature and mechanical strain cycling independently and also cyclic straining at elevated temperature, and the number of cycles to failure were determined. Measurements of crack propagation speed and microstructural studies were made. The results were as shown below:
(1) The inverse relationship between the mechanical strain range and the square root of the number of cycles to failure has been verified.
(2) The maximum temperature is the most sensitive factor in thermal fatigue, and temperature difference may also be considered to be a controlling factor.
(3) The life in thermal fatigue under cycling between maximum and minimum temperature is about 0.3∼0.1 of that in mechanical strain cycling under constant temperature.
(4) Many differences between temperature cycling and constant temperature behaviors are observed.
The paper describes the foregoing results in detail

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Interaction between Brittle Lacquer Coating and Medium Improving Strain Sensitivity

Akira KANNO

1963 Volume 12 Issue 113 Pages 108-114
Published: February 15, 1963
Released on J-STAGE: June 03, 2009

DOIhttps://doi.org/10.2472/jsms.12.108

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In the previous paper, the present author gave a description of a fundamental investigation about the molecular structure and the mechanism of “Solvent-Cracking” on brittle lacquer coating prepared from calcium rosin as a basic ingredient, in order to find out the effectiveness improving strain sensitivity of coating contacted with various media.
In this report, the interaction between the coating and various media is analyzed by considering the factors as follows:
The analysis of interaction will be comparatively easy, if the media are non-polar, but these media used for improvement of strain sensitivity are generally polar such as polyfunctional alcohols having a complicated molecular shape and strong association tendency.
As the result, it was been concluded that the interaction between coating and media, namely, the effectiveness improving the strain sensitivity of coating is proportional logarithmically to the initial dissolving rate of various media.

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