External pressure self-intensification cylinder and design calculation and manufacturing method thereof

External pressure self-intensification cylinder and design calculation and manufacturing method thereof

  • CN 101,655,829 A
  • Filed: 09/14/2009
  • Published: 02/24/2010
  • Est. Priority Date: 09/14/2009
  • Status: Active Application
First Claim
Patent Images

1. , a kind of external pressure self-intensification cylinder and designing and calculating thereof and manufacture method is characterized in that:

  • carry out the self-enhancement processing by cylinder being applied external pressure, the load-bearing capacity p of this cylinder by formula p&

    sigma;

    y
    =lnkj+k2-kj22k2
    Or p&

    sigma;

    y
    =lnkj23+k2-kj23k2
    Determine that behind consideration safety coefficient or the material design ratio n, the calculated thickness t of cylinder by formula t=ri(kj[&

    sigma;

    ]
    [&

    sigma;

    ]lnkj2+[&

    sigma;

    ]-2p
    -1)
    Or t=ri(kj[&

    sigma;

    ]
    [&

    sigma;

    ]lnkj2+[&

    sigma;

    ]-3p
    -1)
    Determine, can guarantee that the equivalent stress of total stress in the cylindrical wall (the unrelieved stress sum after stress that on-stream pressure causes and self-enhancement are handled) is not more than cylinder YIELD STRENGTH σ

    yWherein k is that the footpath is than, k=r o/ r i, r oBe cylinder outer wall radius surface, r iBe cylinder inner wall radius surface, k jBe the plastic zone degree of depth, k j=r j/ r i, r jFor cylinder elastic region and plastic zone interface radius, [σ

    ] are permissible stress, [σ

    ]=σ

    y/ n.

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