ＡＥによるＣＦＲＰロケットモーターノズルホルダーの非破裂評価

Abstract

Acoustic Emission criterion of the fracture is developed for CFRP rocket motor case. This criterion can be applied to detect failure extension in FRP dynamically. Both the criterion of the fracture theories and the nondestructive evaluation methods for FRP are discussed. The developed AE criterion is based on the method of the statistics which includes the prior distribution, the data distribution and the posterior distribution. AE criterion shows the equivalent pressure which relates to the damage extension of the master sample. Three types of the equivalent pressure criterion, such as the fiber breakage criterion, the fiber breakage and delamination criterion and the all failure criterion are based on AE amplitude distribution. Weight functions used in this treatment based on the AE source characterization theory. The predicted burst pressure and the safety ratio are calculated by the equivalent pressure and the proof test pressure. Result of the evaluation indicates that the predicted burst pressure is 7.9MPa and the safety ratio is 1.6. These results are in good agreement with the strain measurement.