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Fully plastic failure stresses and allowable crack sizes for circumferentially surface-cracked pipes subjected to tensile loading

周方向表面亀裂を有する配管が引張荷重を受ける場合の塑性崩壊応力及び許容亀裂深さ

長谷川 邦夫*; Dvo$v{r}$$'a$k, D.*; Mare$v{s}$, V.*; Strnadel, B.*; Li, Y. 

Hasegawa, Kunio*; Dvo$v{r}$$'a$k, D.*; Mare$v{s}$, V.*; Strnadel, B.*; Li, Y.

周方向表面亀裂を有する配管が引張荷重を受ける場合の塑性崩壊応力は正味断面応力概念に基づく極限荷重評価法により見積もることができる。LLC-1と表示する極限荷重は軸方向の荷重のつり合いから求められ、LLC-2と表示する極限荷重は曲げモーメントと軸方向の荷重のつり合いから求められており、米国機械学会規格ASME Codeに採用されている。本論文では、この2種類の極限荷重による塑性崩壊応力を既存の試験結果と比較し、浅い亀裂の場合はLLC-1タイプの塑性崩壊応力は試験結果と比較的近く、深い亀裂の場合はLLC-2タイプの塑性崩壊応力は試験結果と比較的よく一致することを確認した。その結果、現行ASME Codeの極限荷重に基づく許容亀裂深さが保守的であることを確認した。

Fully plastic failure stress for circumferentially surface-cracked pipe subjected to tensile loading can be estimated by means of limit load criterion (LLC) based on the net-section stress approach. LLC of the first type (labelled LLC-1) was derived from the balance of uniaxial forces. LLC of the second type, derived from the balance of bending moments and axial forces (labelled LLC-2), is adopted in Section XI of the ASME (American Society of Mechanical Engineering) Code. From the literature survey of experimental data, failure stresses obtained by both types of LLCs were compared with the experimental data. It can be stated that failure stresses calculated by LLC-1 are better than those calculated by LLC-2 for shallow cracks. On the contrary, for deep cracks, LLC-2 predictions of failure stresses are fairly close to the experimental data. It can be stated that the allowable cracks given in Section XI of the ASME Code are conservative.

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パーセンタイル:71.99

分野:Engineering, Mechanical

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