丸棒と長方形断面試験片とによる引張り特性の比較について アルミニウム合金板状引張り試験片の形状が機械的性質におよぼす影響(第4報)

佐藤 四郎

doi:10.2464/jilm.21.64

Comparison of tensile properties between round and rectangular specimens

Effects of size and shape of specimens on tensile properties of sheet metals of aluminum alloys (4th report)

Shiro SATO

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JOURNAL FREE ACCESS

1971 Volume 21 Issue 2 Pages 64-67

DOI https://doi.org/10.2464/jilm.21.64

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Published: February 28, 1971 Received: November 17, 1970 Available on J-STAGE: July 23, 2008 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 23, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : These investigations were undertaken concerning the effects of shapes of round and rectangular specimens on the tensile properties of aluminum alloys.
The specimens were machined from 30mm thick plate of an aluminum alloy designated as 5052-O.
The principal results obtained were as follows:
(1) The size and shape of test specimens had practically no effects on the proof stress and tensile strength of the material.
(2) The curve representing the relation between δ and L₀√A (in whichδ: elongation percentage, L₀: gaug elength, and A: cross-sectional area of the specimen) of round specimens was virtually identical with that obtained from rectangular specimens having nearly the same width as thickness. However, it was found that δ for the same value of L₀/√A was slightly decreased with the increase in the ratio of width to thickness in rectangular specimens.
(3) When L₀/√A≥10, the values of δ were little different between round and rectangular specimens independent of their sizes and shapes.
(4) In round specimens, the region of shoulder constraining the strain distribution near the end of the reduced section (lf) was nealy equal to the length of the diameter from the end of the straight section.
In rectangular specimens, the value of lf/W (W: width of the specimen) was increased with the decrease in the ratio of width to thickness, and it was approximately equal to 1 in square cross-sectional specimens.
(5) The reduction of area in the fracture section was slightly descreased with the increase in the ratio of width to thickness in specimens of rectangular section, but it was nearly constant in round specimens of different diameters. There was very little difference of the value between round and square cross-sectional specimens.
Right : These investigations were undertaken concerning the effects of shapes of round and rectangular specimens on the tensile properties of aluminum alloys.
The specimens were machined from 30mm thick plate of an aluminum alloy designated as 5052-O.
The principal results obtained were as follows:
(1) The size and shape of test specimens had practically no effects on the proof stress and tensile strength of the material.
(2) The curve representing the relation between δ and L₀/√A (in whichδ: elongation percentage, L₀: gaug elength, and A: cross-sectional area of the specimen) of round specimens was virtually identical with that obtained from rectangular specimens having nearly the same width as thickness. However, it was found that δ for the same value of L₀/√A was slightly decreased with the increase in the ratio of width to thickness in rectangular specimens.
(3) When L₀/√A≥10, the values of δ were little different between round and rectangular specimens independent of their sizes and shapes.
(4) In round specimens, the region of shoulder constraining the strain distribution near the end of the reduced section (l_f) was nealy equal to the length of the diameter from the end of the straight section.
In rectangular specimens, the value of l_f/W (W: width of the specimen) was increased with the decrease in the ratio of width to thickness, and it was approximately equal to 1 in square cross-sectional specimens.
(5) The reduction of area in the fracture section was slightly descreased with the increase in the ratio of width to thickness in specimens of rectangular section, but it was nearly constant in round specimens of different diameters. There was very little difference of the value between round and square cross-sectional specimens.

Date of correction: July 23, 2008 Reason for correction: - Correction: PDF FILE Details: -

Abstract

These investigations were undertaken concerning the effects of shapes of round and rectangular specimens on the tensile properties of aluminum alloys.
The specimens were machined from 30mm thick plate of an aluminum alloy designated as 5052-O.
The principal results obtained were as follows:
(1) The size and shape of test specimens had practically no effects on the proof stress and tensile strength of the material.
(2) The curve representing the relation between δ and L₀/√A (in whichδ: elongation percentage, L₀: gaug elength, and A: cross-sectional area of the specimen) of round specimens was virtually identical with that obtained from rectangular specimens having nearly the same width as thickness. However, it was found that δ for the same value of L₀/√A was slightly decreased with the increase in the ratio of width to thickness in rectangular specimens.
(3) When L₀/√A≥10, the values of δ were little different between round and rectangular specimens independent of their sizes and shapes.
(4) In round specimens, the region of shoulder constraining the strain distribution near the end of the reduced section (l_f) was nealy equal to the length of the diameter from the end of the straight section.
In rectangular specimens, the value of l_f/W (W: width of the specimen) was increased with the decrease in the ratio of width to thickness, and it was approximately equal to 1 in square cross-sectional specimens.
(5) The reduction of area in the fracture section was slightly descreased with the increase in the ratio of width to thickness in specimens of rectangular section, but it was nearly constant in round specimens of different diameters. There was very little difference of the value between round and square cross-sectional specimens.

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