The authors have proposed an influence function method by which stress intensity factor, K, of surface cracks can be calculated easily for arbitrarily distributed surface stresses. They have developed the database of influence coefficients, Kij, for various types of surface cracks through a series of finite element analyses [1]. And they also have developed a software system “SCAN”, based upon the above developed database, by which K-values of surface cracks can be evaluated promptly, and further, fatigue crack propagation can be simulated easily by a personal computer. In this paper the authors have studied how they can apply the SCAN system to the problem of the sub-surface cracks. They have developed “SCAN Sub-Surface Crack Version”, where SCAN is improved by newly analyzed influence coefficients for a series of sub-surface cracks, and by following the scenario described in ASME CODE, SECTION XI [2]. They have found that the database of a surface crack in a flat plate already installed in the SCAN system, with the above described Kij database for sub-surface cracks, can be applied to this problem with satisfactory accuracy, which means the K-values of this problem can be evaluated promptly by the SCAN system, and the propagation of small sub-surface cracks can be simulated easily.

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