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＜論説＞

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, A practical model of a temperature and strain-rate dependent dynamic constitutive equation for carbon steels is proposed. Unknown material constants involved in the proposed constitutive equation can be determined by the non-linear least squares method, which approximates ordinary-impact-test results with calculated values of elasto-plastic waves propagation analyses. In addition static stress-strain curves, longitudinal elastic modulus and yield stress, which are needed for elasto-plastic waves propagation analyses with the proposed constitutive equation, are expressed as a function of temperature. These results enable elasto-plastic waves propagation analyses under wide strain-rate and temperature ranges easily. The present paper has actually determined material constants involved in the proposed constitutive equation and compared the calculated results with measured ones. As a result, it has been confirmed that the proposed equation is applicable at a wide strain rate range and at a room temperature to less than one in which blue brittleness occurs.

22-23 May 1997 (58th). 27-28 Nov. 1997 (59th), 49種類の異なる調合の感圧塗料(PSP)サンプルについて系統的な試験を実施した。プローブ分子には、7種類のポルフィリン、2種類のルテニウム錯体、3種類の芳香化合物を選んだ。それぞれの化合物は、シリコンポリマ、シリコンゴム、ポリエチレン、シリカゲルをバインダとして用いてアルミニウム板上に塗布した。これらのサンプルを、10から100kPaの圧力、273から333Kの温度範囲で、較正チャンバ内で試験した。圧力に対する感度については、ポルフィリンはルテニウム錯体、芳香化合物よりもバインダに対する依存性が小さいことが分かった。幾つかのPSP調合は、PtOEP(白金オクタエチルポルフィリン)とGP197(酸素透過性シリコンポリマ)から成る基準塗料より高い感度を示した。しかし、これらの塗料の温度に対する感度も基準塗料と同程度であった。さらに、より低い温度感度をもつPSPを開発するための研究が必要である。, Systematic tests have been performed on samples of Pressure-Sensitive Pains (PSPs) with 49 different formulations. Seven porphyrins, two ruthenium complexes, and three aromatic compounds were selected as a probe molecule. Each compound was deposited onto aluminum plates using silicon polymer, silicon rubber, polystyrene, and silica gel as a binder. These sample plates were tested in a calibration chamber in the pressure range from 10 to 100 kPa and the temperature range of 273 to 333 K. In terms of pressure sensitivity, it was found that porphyrins were less dependent on binder type than ruthenium complexes and aromatic compounds. Several PSP formulations have been found, which have higher sensitivity than the baseline paint composed of PtOEP (Platinum Octaethyl Porphyrin) and GP197 (oxygen permeable silicon polymer). The temperature sensitivity of those paints, however, is as good as the baseline. Further study will be needed to develop a PSP having lower temperature sensitivity., 資料番号: AA0001434009, レポート番号: NAL SP-38