FATIGUE CHARACTERISTIC DETECTION METHOD AND FATIGUE CHARACTERISTIC DETECTOR

摘要

PROBLEM TO BE SOLVED: To reduce the time required for fatigue test.;SOLUTION: A prescribed number of test pieces composed from test target material fixed to a vibrator base are vibrated, and the number of times stress occurred to the test pieces due to vibration is counted for each test piece as stress repetition count (step S3). When it is determined that any of the test pieces fixed to the vibrator base has reached a fatigue state, a stress range and a stress repetition count occurred to the test piece determined to have reached the fatigue state are acquired as fatigue characteristic information (steps S6, S7), and the test piece determined to have reached the fatigue state is replaced with an other test piece composed from the same material as this test piece (step S9). In this case, after a change of test pieces is completed, a stress repetition count is counted from an initial value with regard to the new test piece fixed to the vibrator base, and a stress repetition count for other test pieces is counted from a point of time when vibration is discontinued.;SELECTED DRAWING: Figure 20;COPYRIGHT: (C)2019,JPO&INPIT