ハスヌマ　ショウタ   HASUNUMA Shota   蓮沼　将太    所属   青山学院大学  理工学部 機械創造工学科    職種   准教授
言語種別	日本語
発行・発表の年月	2011/12
形態種別	学術雑誌
査読	査読あり
標題	低サイクル疲労における微小き裂の進展および合体の破壊力学的検討
執筆形態	共同
掲載誌名	材料(日本材料学会)
巻・号・頁	1060-1065頁
著者・共著者	蓮沼将太，小川武史，菊池正紀
概要	Under low cycle fatigue condition, small cracks initiate on the specimen surface, and then they grow and coalesce with each other. The coalescence of small cracks is an important factor in evaluating fatigue life based on the fracture mechanics approach. However, surface observation of the coalescence is not sufficient in order to understand the mechanism and the influence on the fatigue life. Present study performed numerical simulations of the crack coalescence using the S-FEM based on the linear elastic fracture mechanics. The results revealed that the fatigue life was reduced when the main crack coalesces with a crack of comparative size, while the effect of fatigue life reduction was small when the main crack coalesces with a crack of less than half size. Experimental results were compared with the simulated results.