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  • The Ultimate Strength of Thick Walled Cylinders
  • アツニク エントウ ノ ツヨサ ニ ツイテ

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There are several formulas for assuming the ultimate strength of thick walled cylinders abjected to internal pressure. To verify these formulas, pressure tests for thick walled cylinders made of mild steel, semi-hardened steel, 13 per cent Cr steel and 18Cr-8Ni stainless steel respectively were conducted. The experimental results were shown to be in approximate agreement with the ultimate pressure of the cylinders computed by Manning's theory. Manning's method is, however, so complicated and cumbersome that we used our particular method, which is simpler than Manning's method. Experimental formulas : PB/σB=0.970 logs K for cylinders made of mild steel, semi-hardened steel and 13 per cent Cr steel, respectively. PB/σB=0.796 logs K for cylinders made of 18Cr-8Ni stainless steel. Additional tests : we tested cylinders which had eccentric bores, and compared these results with those of normal cylinders.

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