| 摘要 |
PROBLEM TO BE SOLVED: To predict more accurate fatigue damage by accurately grasping interfacial changes and knowing the local position of maximum heat variation more accurately, to avoid a remarkable increase in computation quantity when a heat layer is formed, and to actualize earth-scale network management for fatigue prediction. SOLUTION: This system comprises an analyzer separator 18 which separates the time-series temperature T(t) of the external surface of a pipe 2 into long- cycle temperature variation TLO and short-cycle temperature variation TLO and a long-cycle unit 21 which calculates long-cycle stress through FEM analysis according to the long-cycle temperature variation TLO and outputs its long-cycle stress variationΔσL. For the FEN analysis, steadiness is assumed. A short-cycle unit 22 is further provided which outputs short-cycle stress variationΔσS according to the short-cycle temperature variation. The assumption of the steadiness correctly reflects physical phenomena and evades a remarkable increase in computation quantity. The earth-scale network for management can be formed through peal-time fatigue prediction.
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