1310 構造用合板の面内せん断疲労に及ぼす負荷周波数の影響 : ひずみエネルギー解析(G03-2 き裂進展・疲労損傷・表面処理,G03 材料力学)

概要

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Effect of loading frequency on fatigue behavior of structural plywood under shear load through the thickness was experimentally investigated. Pulsating load with loading frequency of 0.5 or 5Hz was applied along the length of specimens. Applied peak stress was determined as 0.5, 0.7, and 0.9 stress levels. Hysteresis loop for each loading cycle was determined by measuring the load and the shear strain at the center of the specimen surface throughout the fatigue tests. The area enclosed by a hysteresis loop was defined as the energy loss per cycle. Fatigue life obtained in each stress level was longer at higher loading frequency. Energy loss per cycle was observed to be smaller at higher loading frequency, causing less damage to plywood specimen. Cumulative energy loss, which is the sum of energy loss per cycle throughout fatigue test, was almost the same value between the two loading frequencies in each stress level. Cumulative energy loss could be, therefore, a fatigue indicator independently of loading frequency that substitute for fatigue life.
社団法人日本機械学会の論文
2005-09-18