き裂とコンプライアンスを有する不静定な配管系の塑性崩壊挙動と終局強度

概要

論文の詳細を見る
The effects of crack size, compliance and fracture toughness on plastic collapse behavior and ultimate strength of a statically indeterminate pipe system have been analyzed. The main results obtained are as follows. 1) For the case of J_IC≧500kN/m and dJ/da≧100MN/m^2, these parameters have little effect on plastic collapse behavior and ultimate strength. 2) The J-integral value at the onset of plastic collapse depends on crack size, pipe span length, compliance and loading system. However the highest value is lower than 8 MN/m. 3) The plastic rotation angle of plastic hinge at the onset of collapse is lower than 0.2 [rad]. This value is important when considering the LBB (leak before break) behavior of a piping system. 4) The analysis method adopted in this paper is useful and convenient for evaluation of the tearing instability behavior of a piping system.
1996-05-25