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涌井 隆; 斎藤 滋; 二川 正敏
実験力学, 24(4), p.212 - 218, 2024/12
J-PARCの核破砕中性子源水銀ターゲット容器の寿命を決定する主要な要因の一つは照射損傷である。使用済み容器の材料劣化を把握するため、使用済み容器の構造材料に対する押込み試験と数値実験による逆解析を用いた評価を行う予定である。照射量の異なる2種類のイオン照射材料に対して、この評価手法を適用した。照射量の増加に伴い、引張強度が増加し、全伸びが減少することが確認された。これらの傾向は、ばらつきを考慮した微小試験片の引張試験によって報告されている材料劣化挙動と同等である。さらに、容器は繰り返し熱負荷を受け、定格最大ビーム出力では容器の温度が140Cを超えると推定されるため、温度上昇に伴う全伸びと照射材料の疲労強度の低下について検討した。
Wan, T.; 大林 寛生; 佐々 敏信
可視化情報学会誌(USB Flash Drive), 36(Suppl.2), 8 Pages, 2016/10
An ADS Target Test Facility (TEF-T) will be constructed within the framework of J-PARC project. A LBE spallation target will be installed in the TEF-T, and be bombarded by high power pulsed proton beams. During the operation, the erosion/cavitation damage imposed on the target vessel might be a key factor that determines its lifetime. Therefore, an in-situ structural integrity evaluation technique for the TEF-T target is expected to be established to inspect the damage. The vibration of LBE target vessel excited by pressure waves, which caused by the heat deposition in a short time due to the pulsed proton beam injection, will be monitored remotely to establish the technique. In this study, the basic research was carried out to investigate the relationship between structural vibration and damage. Samples with global- and locally-distributed erosion/cavitation damage were remotely evaluated by using laser generator and detector of ultrasonic waves. The influences of number and depth of damage on sample to structural vibration were studied through experiments and numerical simulations. A technique, Wavelet Differential Analysis (WDA), was developed to quantitatively and clearly "visualize" the differences caused by damage in the vibration signals. The results showed that the structural vibration is very dependent on damage, and the developed technique is applicable of quantitatively indicate this dependency.