なぜ計算において、二次応力の制限は一次応力の範囲よりもはるかに大きいのでしょうか？
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二次は熱状態ではないのか、この場合なぜ一次の冷状態より制限が低くないのか
アメリカの規格にある二次応力の式を見ればわかる
規格要件。つまり、塑性変形を防ぐためです
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