ぜい性高速破壊停止用ストップホール（クラックアレスタ）に関する基礎研究: 第2報，移動有限要素解析によるき裂再進展状態の考察

摘要

The stop hole is one of the crack arrester systems, which is used to prevent the growth of fatigue cracks. However, the stop hole is not expected to prevent high-speed crack propagation. Because the mechanical condition of fast crack propagation behavior near the stopping hole is not cleared, the criterion of the stop for brittle fracture is not established. In this study, authors focus re-propagation start (restart) condition of crack from the stop hole. To discuss the restart condition of high-speed crack propagation, experiment observation and finite element analysis result are compared. In the numerical simulation, dynamic crack propagation simulations are carried out, using the moving finite elememt method based on Delaunay automatic triangulation. The various parameters are calculated from the numerical results.%構造物において破壊事故が生じた場合，被害低減のrnため，き裂進展が構造物中の重要部に到達することをrn防止する事が必要となる．構造物中のき裂進展を停止rnさせるクラックアレスタ機構の一つとして円孔（ストrnップホール）がある．