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新封封頭對于橢圓封頭和大型封頭應用時的強度分析
發布時間:2022-03-29  瀏覽量:2193次

在封頭國家標準GB150—1998《鋼制壓力容器》中,分別給出了圓筒形殼體、球形殼體、錐形殼體、橢圓封頭和大型封頭強度計算公式,并且規定圓筒形殼體計算公式的應用條件為Pc≤0.4[σ]tφ、球形殼體計算公式的應用條件為Pc≤0.6[σ]tφ,但對其他殼體卻未作任何限定。

新封封頭根據標準及日常加工生產應用中得出,無折邊錐形殼體計算公式的應用條件為,折邊錐形殼體計算公式的應用條件為。比較這幾種殼體強度計算公式在封頭國標(GB150)可見:公式的形式非常相似,其實質都是以薄膜應力為基礎的。薄膜理論是一種近似的應力分析方法,當殼體的壁厚較大時其計算結果與實際情況誤差較大,GB150中規定圓筒形殼體和球形殼體計算公式的應用條件也就是為了限定殼體的壁厚,以免計算結果與實際情況誤差過大。

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