203 非同列複数き裂の疲労進展寿命評価方法(OS2-(1)オーガナイズドセッション《材料強度と構造設計》)

概要

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It is generally believed that multiple fatigue crack growth prediction is difficult with the use of standard stress intensity factor (SIF) solution calculations because of the complicated nature of such issues as magnification and shielding effects. Therefore, almost all the existing FFS rules such as the ASME Boiler Pressure Vessel Code and JSME Code adopt the procedure of recharacterizing multiple cracks into one enveloping crack, after applying a certain alignment rule based on the initial crack configuration. In some cases, the results of the procedures in the existing FFS rules can be unrealistic and may lead to unreliable predictions of the service life of cracked components. This paper describes a new approach to predicting multiple nonaligned fatigue crack growth life under external bending by the use of standard SIF solutions. Several examples, as compared with experimental results in the literature for three-dimensional models, illustrate the accuracy and effectiveness of the procedure.
2010-08-27