著者

遠藤 正浩

出版者

社団法人日本材料学会

雑誌

材料 = JOURNAL OF THE SOCIETY OF MATERIALS SCIENCE, JAPAN (ISSN:05145163)

巻号頁・発行日

vol.55, no.10, 2006-10-15

著者

林 知行

出版者

社団法人日本材料学会

雑誌

材料 = JOURNAL OF THE SOCIETY OF MATERIALS SCIENCE, JAPAN (ISSN:05145163)

巻号頁・発行日

vol.53, no.3, pp.345-350, 2004-03-15

参考文献数

19

被引用文献数

2

著者

小川 欽也 杉山 文子

出版者

社団法人日本材料学会

雑誌

材料 = JOURNAL OF THE SOCIETY OF MATERIALS SCIENCE, JAPAN (ISSN:05145163)

巻号頁・発行日

vol.53, no.5, pp.560-565, 2004-05-15

参考文献数

7

被引用文献数

2 7

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The Split Hopkinson pressure bar (SHPB) method has been used for impact tests such as compression and shearing, and is currently modified for tensile test, since the various kinds of high strength sheet metals are greatly concerned with the safety and the energy saving demands for high velocity vehicles. Evaluation of mechanical properties by a tensile test using the SHPB, however, has not been clarified, since the testing conditions such as specimen geometry and settings are quite different from the usually operated compression version. In the present paper, we try to identify the characteristics of the method, particularly such as a yielding phenomena, and have clarified the effect of three dimensional stress wave propagation in the tensile test where a large ratio of sectional areas between a specimen and a loading bar is usually inevitable.

著者

松島 康 可児 弘毅

出版者

社団法人日本材料学会

雑誌

材料 = JOURNAL OF THE SOCIETY OF MATERIALS SCIENCE, JAPAN (ISSN:05145163)

巻号頁・発行日

vol.53, no.3, pp.278-282, 2004-03-15

参考文献数

15

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Shock induced polymorphic transition of pure iron (99.5%) has been investigated experimentally using in-material self-made manganin gauges which has a shape of one-turn coil. A negative pulse is superposed on an output signal from the gauge in the pressure range above about 18GPa. The negative pulse is thought to be originated in shockinduced polymorphic transition (α-ε phase transition) because the polymorphic transition is followed by magnetic transition (ferromagnetic to paramagnetic). The iron plate specimens between which a manganin gauge is sandwiched are magnetized in the vicinity of the gauge by constant current applied to the gauge. The polymorphic transition behind shock front reduces magnetic flux near the gauge when the shock front passes through the gauge. This flux reduction generates the negative pulse. From the negative pulse superposed on a gauge signal, information on the polymorphic transition can be obtained. Experimental data show that the negative pulse appeared in the pressure range above 18GPa and the amplitude of the pulse increased with the applied pressure. It is inferred from the discussion about experimental data that the maximum rate of transition increases with applied pressure.