@article{oai:nagoya.repo.nii.ac.jp:00007472, author = {田中, 啓介 and TANAKA, Keisuke and 秋庭, 義明 and AKINIWA, Yoshiaki and 來海, 博央 and KIMACHI, Hirohisa and 伊藤, 和之 and ITOH, Kazuyuki}, issue = {680}, journal = {日本機械学會論文集 A編}, month = {Apr}, note = {Fatigue tests of vulcanized natural rubber were conducted under displacement-controlled conditions. The specimens were of three types: smooth specimen, specimen with an artifical surface defect of 0.2 mm in diameter, and specimen with an artifical through-thickness defect of 2 mm in length. In smooth specimens, a fatigue crack started from natural defects of about 0.15 mm in size, and grew as an internal crack, and then became a through-thickness crack. The spring constant of the specimen decreased slowly in the range of about 80% of the total life (Stage A), followed by a rapid decrease (Stage B). The transition from Stage A to B took place when a crack penetrated through the thickness. The rate of fatigue crack propagation is expressed as a second-power function of the J-integral range both for surface cracks and through-thickness cracks. The J-integral was evaluated from the crack-center opening displacement.}, pages = {758--765}, title = {防振ゴム材料における疲労き裂進展挙動へのJ 積分の適用}, volume = {69}, year = {2003} }