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[in Japanese]Article type: Article
1925 Volume 28 Issue 102 Pages 797-819
Published: 1925
Released on J-STAGE: August 01, 2017
MAGAZINE FREE ACCESSIn a high speed repeated torsion tester of constant stress range type designed by the author, the test piece is to be chucked one end on the armature of an oscillating motor and the other end to the torsion bar. The torsion bar is used to measure repeated torque by the method of lamp and scale. The constructions of the oscillating motor is the same as an ordinary D. C. motor, and if alternating current or pulsating current of any frequency is supplied to the armature while direct current being supplied to the field coils, the armature will exert alternating or pulsating torque on the test piece. So-called rapid method proposed by Gough can also be carried out simply and accurately by this machine, (but the author could not find out such a fatigue limit as found by Gough.) On carrying out the endurance test, it is advisable to use the resonance phenomena of torsional vibration, because in the vicinity of that frequency the armature current decreases and the wave form of repeated torque becomes more regular. Adding some simple attachments to this machine, ordinary simple torsion test can also be carried out. The test pieces to suit this machine can be made simply and accurately by means of a milling machine giving rotation and axial feed to the test pieces.View full abstractDownload PDF (1940K) -
[in Japanese]Article type: Article
1925 Volume 28 Issue 102 Pages 820-835
Published: 1925
Released on J-STAGE: August 01, 2017
MAGAZINE FREE ACCESSThe author prepared new two series of strong light aluminium alloys by special heat-and mechanical treatments. One of them, called C6 alloy, contains 6% copper and 94% aluminium. Its mechanical properties are as follows : 1mm plate. [table] As seen from the Table, the new alloy is non inferior to, or rather excells Duralumin. The composition of the other series of alloys, MC, is as follows : Copper‥‥‥‥1-2% Magnesium‥‥‥‥0.5-1% Aluminium‥‥Balance. These alloys, after properly worked, are quenched at 520℃ and cold-worked to some extent, then annealed at 150℃. The finished 2mm plates of this material have the following mechanical properties. Maximnm tensile strength‥‥‥‥‥‥44-57kg/mm^2 Elastic limit (3/1000")‥‥‥‥‥‥‥38-45kg/mm^2 Elongation (50mm)‥‥‥‥‥‥‥‥‥7-9% Brinell hardness number‥‥‥‥‥‥112-140 Comparing his new alloys, including MS alloy published in the Jurnal of the Iron & Steel Institute of Japan, Vol. XI, No.6, 1925 (Si=0.5-2%, Mg=0.4-0.6%, balance A1), the author reviewed the general tendency of making light aluminium alloy, mainly for aeronautical use.View full abstractDownload PDF (865K) -
[in Japanese]Article type: Article
1925 Volume 28 Issue 102 Pages 836-855
Published: 1925
Released on J-STAGE: August 01, 2017
MAGAZINE FREE ACCESSDownload PDF (1656K)
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