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ひずみによる動的降伏強度の簡便測定法 A Simple Measurement Method of Dynamic Yield Strength using Strain Data Tachiya, Hiroshi Chatani, Akiyoshi Hojo, Akihiro 10216989 立矢, 宏 30019731 茶谷, 明義 80019778 放生, 明廣 Copyright © The Japan Society of Mechanical Engineers 日本機械学会 Generally, measurements of the stress-strain curve are required in order to determine the yield strength. However, it is difficult to measure dynamic stresses induced in materials due to the complicated propagation of the stress waves. In contrast to this, measuring strain data is relatively easy. When the materials are subjected to impact force, elastic waves propagate first. After the strain becomes larger than yield strain, plastic waves occur. Therefore the strain rate changes discontinuously at this point, although the strain increases smoothly. By measuring the strain waves induced in a test piece rod subjected to longitudinal impact force as a step waveform, the strain rate profiles are obtained based on numerical differentiation. For the previous reason, the dynamic yield point can be estimated by change of the strain rate. The dynamic yield stresses are obtained by multiplying those values by Young's modulus measured from the static compress or tensile tests. This paper confirmed the possibility of the present method based on numerical simulations and discussed practicality by measuring the dynamic yield strength of materials under various strain rates. 金沢大学高度モビリティ研究所 / 金沢大学理工研究域機械工学系 The Japan Society of Mechanical Engineers = 日本機械学会 1995-04-25 2017-10-03 jpn journal article VoR https://doi.org/10.24517/00008857 http://hdl.handle.net/2297/36739 https://kanazawa-u.repo.nii.ac.jp/records/8870 10.24517/00008857 10.1299/kikaia.61.842 https://www.jstage.jst.go.jp/browse/kikaia1979/-char/ja/ http://www.jsme.or.jp/ http://ci.nii.ac.jp/naid/110002372318 AN0018742X 0387-5008 日本機械学會論文集 A編 = Transactions of the Japan Society of Mechanical Engineers Series A 61 584 842 848 https://kanazawa-u.repo.nii.ac.jp/record/8870/files/TE-PR-TACHIYA-H-842.pdf application/pdf 762.3 kB 2017-10-03