加振時の破損確率評価手法の基礎的研究

～ランダム波加振より簡易試験体に累積した振動エネルギと破損の関係～

抄録

The various vibration tests have been carried out, depending on a specification and a shape of the structure. However, the data obtained from these vibration tests are underutilized in the failure evaluation for vibration. In this study, the failure probability assessment method is investigated for classified structure based on these test data. Furthermore, an evaluation indicator, which can be evaluated regardless of differences in input waves, is necessary to adapt this method to other structures and equipment. In previous studies, the sine wave vibration tests with the simple examination specimens were carried out to investigate the accumulated vibration energy in the equipment. In this report, vibration tests were conducted by random waves. We compared the relationships between the accumulated energy to failure and the accumulated energy per unit time in cases of random waves and sine waves. In addition, to develop a method that can evaluate the possibility of failure without the vibration test, a failure assessment method with the analysis and material data was presented. As a result, even when random waves are input, the accumulated energy increased with increasing input acceleration. It is similar to the previous results by sine wave. Furthermore, by using FEM analysis, time history response analysis and S-N curve, it is possible to predict failure without conducting experiments. In the future, we will conduct the other random wave vibration tests at other materials and establish a failure probability assessment method.