caa a22 4500 463223543 CHVBK 20180405153219.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10853-007-1828-y doi (NATIONALLICENCE)springer-10.1007/s10853-007-1828-y Damage evaluation of refractories under cyclic loading-unloading processes using ultrasonic method [Elektronische Daten] [Ryoichi Furushima, Yohtaro Matsuo, Tadashi Shiota, Kouichi Yasuda] Accumulation of damage by cyclic loading-unloading under uni-axial compressive stress was evaluated using ultrasonic method for two kinds of refractories: alumina/graphite (AG) and isotropic graphite (IG) refractories. Change of relative degradation in apparent sonic velocity VRD was used for a barometer on damage evaluation of IG and AG refractories. Measurement of change in VRD actualizes in-situ evaluation of damage during loading-unloading processes. Difference of change in VRD during loading-unloading processes was observed between both specimens, which suggested the damage mechanism is different in IG and AG. Accumulation of damage for AG specimens by cyclic loading-unloading was very little, while it is a little larger for IG specimens. An increase in applied stress ratio R contributed to an increase in degree of damage accumulation. To explain the damage mechanism for both AG and IG specimens, we consider damage models, respectively. In these models, loading-unloading processes were classified into 4 steps based on the behavior of change in VRD, and damage of the two kinds of specimens was explained by relating to crack nucleation and crack opening-closing mechanism in each step. Springer Science+Business Media, LLC, 2007 Furushima Ryoichi Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut Matsuo Yohtaro Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut Shiota Tadashi Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut Yasuda Kouichi Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/20(2007-10-01), 8652-8661 0022-2461 42:20<8652 2007 42 10853 https://doi.org/10.1007/s10853-007-1828-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1828-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Furushima Ryoichi Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Matsuo Yohtaro Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Shiota Tadashi Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Yasuda Kouichi Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8552, Meguro-ku, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/20(2007-10-01), 8652-8661 0022-2461 42:20<8652 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer