DRUM DEGRADATION EVALUATION METHOD OF DRUM MIXER, AND DRUM DEGRADATION RECOVERY METHOD

摘要

PROBLEM TO BE SOLVED: To provide a drum degradation evaluation method of a drum mixer capable of accurately calculating a remaining life due to crack progress of a drum in the drum mixer, and to provide a drum degradation recovery method based on the drum degradation evaluation method.SOLUTION: A remaining life until a crack of a drum reaches limit crack depth is calculated by adding increase of drum stress based on time-dependent wall thickness reduction of the drum and time-dependent vibration increase of the drum.