| 摘要 |
PURPOSE: To quantitatively evaluate a load margin to crack unstable breakage in an object. CONSTITUTION: A data input part 12 detects the temperature of an evaluation object 1 with a temperature sensor 11 and at the same time, measures the load. An FEM analysis part 13 models an evaluation object part 10 of the evaluation object 1 and a rod test piece 14 into finite elements so as to analyze them by the FEM and a stress hysteresis data 15 in the adjacent of a crack part 2 and stress data 16 in breaking are calculated by a numerical analysis. A Weibull stress analysis part 17 finds the Weibull stressσw from the stress conditions in the adjacent of the crack part 2 and the distribution of breakage probability of the Weibull stressσw in relation to respective temperature conditions is found from the rod test piece 14. And, the relation of the Weibull stress - the breakage probability found by the Weibull stress and a material test of the evaluation object part 10 is analyzed so as to measure the time change in breakage probability and monitor load margin up to a preset breakage probability.
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