| 摘要 |
A method of predicting growth of a crack in a member includes memorizing, for each portion on the member, stress distribution Δσ(a) in the depth direction obtained in the case that no crack is present, a relationship between depth of growing cracks and creep contribution, and a relationship between creep contribution and parameters C and in of the Paris's law, receiving from a user an indication of a certain portion on the member, acquiring the stress distribution Δσ(a) in the depth direction for the certain portion, acquiring a creep contribution at the depth of a growing crack for the certain portion, from the relationship between depth of cracks and creep contribution memorized for the certain portion, and acquiring parameters C and in corresponding to the acquired creep contribution, from the relationship between creep contribution and parameters C and m of the Paris's law memorized for the certain portion. |
| 主权项 |
1. A method of predicting growth of a crack in a member comprising the steps, executed by an information processing device, of:
memorizing, for each portion on the member, stress distribution Δσ(a) in the depth direction obtained in the case that no crack is present, a relationship between depth of growing cracks and creep contribution, and a relationship between creep contribution and parameters C and m of the Paris's law; receiving from a user an indication of a certain portion on the member; acquiring the stress distribution Δσ(a) in the depth direction for the certain portion; acquiring a creep contribution at the depth of a growing crack for the certain portion, from the relationship between depth of cracks and creep contribution memorized for the certain portion; acquiring parameters C and m corresponding to the acquired creep contribution, from the relationship between creep contribution and parameters C and m of the Paris's law memorized for the certain portion; and predicting the growth of the crack in the certain portion, based on the following equations:
da/dN=C×(ΔK)m,andΔK=Δσ(a)×(π×a)1/2 wherein “a” is a crack depth, N is a number of occurrences of a cyclic stress, C and m are constants determined for a member, and ΔK is a stress intensity factor range. |
