書誌事項
- タイトル別名
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- Effects of Lowering of Machine-Stiffness on Discontinuous Deformation of 7075-Al Alloy
- 7075 Al ゴウキン ノ フレンゾク ヘンケイ ニ オヨボス シケンキ ゴ
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It has been clarified in a previous report that in the case of high machine-stiffness, the stress drop and time interval increase with increasing spring constant ratio α. However, it is unknown whether such a dependence may apply to low-stiffness machine systems. The purpose of this report is to clarify the influence of the stiffness on the plastic elongation and stress drop in the discontinuous deformation using 7075-Al alloy and to discuss it together with the previous results obtained using a high-stiffness machine.<BR>The method to lower the stiffness of the testing machine is to insert a spring between the load cell and the specimen grip. The cross head speed was selected so that the plastic strain rate approximately may equal 3×10−5 s−1. Tensile tests were performed at 303 K.<BR>It was found that the form of the stress-strain curve changed from a periodical to a stepped one as the stiffness is decreased. The stress drop showed a peak at a certain α while the plastic elongation increased monotonously with increasing α. The plastic elongation tended to saturate for large α especially at low strain. The stress drop for large α had a negative value and this was explained in terms of the plastic instability of local deformation of the specimen.
収録刊行物
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- 日本金属学会誌
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日本金属学会誌 53 (7), 678-684, 1989
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390001206483442048
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- NII論文ID
- 130007335495
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- NII書誌ID
- AN00187860
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- ISSN
- 18806880
- 24337501
- 00214876
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- NDL書誌ID
- 3247718
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- データソース種別
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- JaLC
- NDL
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