External pressure selfintensification cylinder and design calculation and manufacturing method thereof
External pressure selfintensification 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
1. , a kind of external pressure selfintensification cylinder and designing and calculating thereof and manufacture method is characterized in that:
 carry out the selfenhancement processing by cylinder being applied external pressure, the loadbearing capacity p of this cylinder by formula $\frac{p}{{\mathrm{\σy=\mathrm{ln}{k}_{j}+\frac{{k}^{2}{k}_{j}^{2}}{2{k}^{2}}}}_{}}$Or $\frac{p}{{\mathrm{\σy=\frac{\mathrm{ln}{k}_{j}^{2}}{\sqrt{3}}+\frac{{k}^{2}{k}_{j}^{2}}{\sqrt{3}{k}^{2}}}}_{}}$Determine that behind consideration safety coefficient or the material design ratio n, the calculated thickness t of cylinder by formula $t={r}_{i}({k}_{j}\sqrt{\frac{[\mathrm{\σ][\mathrm{sigma;]\mathrm{ln}{k}_{j}^{2}+[\mathrm{sigma;]2p1)}}}}{}}$Or $t={r}_{i}({k}_{j}\sqrt{\frac{[\mathrm{\σ][\mathrm{sigma;]\mathrm{ln}{k}_{j}^{2}+[\mathrm{sigma;]\sqrt{3}p1)}}}}{}}$Determine, can guarantee that the equivalent stress of total stress in the cylindrical wall (the unrelieved stress sum after stress that onstream pressure causes and selfenhancement are handled) is not more than cylinder YIELD STRENGTH σ
_{y}Wherein k is that the footpath is than, k=r _{o}/ r _{i}, r _{o}Be cylinder outer wall radius surface, r _{i}Be cylinder inner wall radius surface, k _{j}Be the plastic zone degree of depth, k _{j}=r _{j}/ r _{i}, r _{j}For cylinder elastic region and plastic zone interface radius, [σ
] are permissible stress, [σ
]=σ
_{y}/ n.
Chinese PRB Reexamination
Abstract
The invention discloses an external pressure selfintensification cylinder and a design calculation and a manufacturing method thereof, which is used for improving the safety and the bearing capability of a pressure vessel and solving the phenomenon of lacking external pressure selfintensification vessel design calculation and manufacturing methods and the technical problems of unsafety and the like caused by complex or inaccurate design calculation of the existing internal pressure selfintensification technology. The invention has the following technical scheme key points: adopting a special bearing capability, plastic zone depth and cylinder wall thickness calculating formula to ensure that the equivalent stress of the total stress (the sum of stress caused by operation pressure and selfintensification residual stress) in the wall of the cylinder is not more than the yield strength sigma y of cylinder material; or ensuring that the equivalent stress of the residual stress in the whole cylinder wall of the selfintensification cylinder and the equivalent stress of the total stress are both not more than sigma y. The invention also provides a maximum diameter ratio which does not yield after the selfintensification pressure is removed no mater how deep the plastic zone is when the selfintensification technology is applied. The technical scheme of the invention is also suitable for an internal pressure selfintensification cylinder.

13 Citations
Equalstrength selfenhancement pressure vessel with variable structure size  
Patent #
CN 103,470,757 A
Filed 10/11/2013

Current Assignee

Technological method for enhancing bearing capacity of pressureresistant structure  
Patent #
CN 103,406,724 A
Filed 07/30/2013

Current Assignee

Firearms Autofrettaged Gun Barrel design method based on fourth strength theory  
Patent #
CN 107,515,983 A
Filed 08/18/2017

Current Assignee

Highpressure oil cylinder with composite structure  
Patent #
CN 104,196,824 A
Filed 08/26/2014

Current Assignee

Elastic temperature difference prestress pressure container  
Patent #
CN 104,358,867 A
Filed 11/14/2014

Current Assignee

Selfenhancement pressure container adopting elastic temperature difference prestressed internalpressure internal heating  
Patent #
CN 104,405,869 A
Filed 11/14/2014

Current Assignee

Externalpressure elastic differentialtemperatureprestress externalheating selfenhanced pressure vessel  
Patent #
CN 104,455,410 A
Filed 11/14/2014

Current Assignee

Selfreinforcing pressure container based on safety design technical conditions  
Patent #
CN 102,563,063 A
Filed 12/27/2011

Current Assignee

Manufacturing method of cylinder for bearing internal pressure  
Patent #
CN 105,033,484 A
Filed 08/04/2015

Current Assignee

Lowtemperature prestress internalpressure internalheating pressure vessel  
Patent #
CN 105,508,600 A
Filed 01/07/2016

Current Assignee

Hightemperature prestressed innerpressure inner heating type pressure vessel  
Patent #
CN 105,443,752 A
Filed 01/08/2016

Current Assignee

Firearms monotubular barrel design method based on fourth strength theory  
Patent #
CN 107,314,705 A
Filed 08/18/2017

Current Assignee

Stress distribution method for hyperpressure testing apparatus  
Patent #
CN 106,442,150 A
Filed 08/30/2016

Current Assignee

No References
4 Claims

1. , a kind of external pressure selfintensification cylinder and designing and calculating thereof and manufacture method is characterized in that:
 carry out the selfenhancement processing by cylinder being applied external pressure, the loadbearing capacity p of this cylinder by formula
$\frac{p}{{\mathrm{\σy=\mathrm{ln}{k}_{j}+\frac{{k}^{2}{k}_{j}^{2}}{2{k}^{2}}}}_{}}$ Or$\frac{p}{{\mathrm{\σy=\frac{\mathrm{ln}{k}_{j}^{2}}{\sqrt{3}}+\frac{{k}^{2}{k}_{j}^{2}}{\sqrt{3}{k}^{2}}}}_{}}$ Determine that behind consideration safety coefficient or the material design ratio n, the calculated thickness t of cylinder by formula$t={r}_{i}({k}_{j}\sqrt{\frac{[\mathrm{\σ][\mathrm{sigma;]\mathrm{ln}{k}_{j}^{2}+[\mathrm{sigma;]2p1)}}}}{}}$ Or$t={r}_{i}({k}_{j}\sqrt{\frac{[\mathrm{\σ][\mathrm{sigma;]\mathrm{ln}{k}_{j}^{2}+[\mathrm{sigma;]\sqrt{3}p1)}}}}{}}$ Determine, can guarantee that the equivalent stress of total stress in the cylindrical wall (the unrelieved stress sum after stress that onstream pressure causes and selfenhancement are handled) is not more than cylinder YIELD STRENGTH σ
_{y}Wherein k is that the footpath is than, k=r _{o}/ r _{i}, r _{o}Be cylinder outer wall radius surface, r _{i}Be cylinder inner wall radius surface, k _{j}Be the plastic zone degree of depth, k _{j}=r _{j}/ r _{i}, r _{j}For cylinder elastic region and plastic zone interface radius, [σ
] are permissible stress, [σ
]=σ
_{y}/ n.
 carry out the selfenhancement processing by cylinder being applied external pressure, the loadbearing capacity p of this cylinder by formula

2. external pressure selfintensification cylinder as claimed in claim 1 and designing and calculating thereof and manufacture method is characterized in that:
 k≤
k _{c}The time, the plastic zone degree of depth of this cylinder is pressed k _{j}=k determines that this moment, its loadbearing capacity p pressed$\frac{p}{{\mathrm{\σy=\mathrm{ln}k}}_{}}$ Or$\frac{p}{{\mathrm{\σy=\frac{2}{\sqrt{3}}\mathrm{ln}{k}^{2}}}_{}}$ Determine, promptly equal full yield pressure, behind consideration safety coefficient or the material design ratio n, the calculated thickness t of cylinder is t=r by formula _{i}(e ^{P/[σ]}1) or$t={r}_{i}({e}^{\sqrt{3}p/2[\mathrm{\σ]1)}}$ Determine;
K 〉
=k _{c}The time, plastic zone degree of depth k _{j}By formula${k}^{2}\mathrm{ln}{k}_{j}^{2}{k}^{2}{k}_{j}^{2}+2=0$ Determine that this moment, loadbearing capacity p pressed$\frac{p}{{\mathrm{\σy=\frac{{k}^{2}1}{{k}^{2}}=2\frac{{p}_{e}}{{\mathrm{sigma;y}}_{}}}}_{}}$ Or$\frac{p}{{\mathrm{\σy=\frac{2}{\sqrt{3}}\frac{{k}^{2}1}{{k}^{2}}=2\frac{{p}_{e}}{{\mathrm{sigma;y}}_{}}}}_{}}$ Determine that behind consideration safety coefficient or the material design ratio n, the calculated thickness t of cylinder presses$t={r}_{i}(\sqrt{\frac{[\mathrm{\σ][\mathrm{sigma;]p1)}}}{}}$ Or$t={r}_{i}(\sqrt{\frac{2[\mathrm{\σ]2[\mathrm{sigma;]\sqrt{3}p1)}}}{}}$ Determine;
Determine like this plastic zone degree of depth of cylinder and loadbearing capacity can guarantee cylinder after selfenhancement is handled in the whole barrel equivalent stress of unrelieved stress and the equivalent stress of total stress all be not more than cylinder YIELD STRENGTH σ
_{y}Wherein k, r _{i}, [σ
] according to claim 1, p _{e}Maximum flexibility loadbearing capacity when not doing selfenhancement (initial yield load) for cylinder, k _{c}For critical footpath ratio, equal by formula$\frac{{k}^{2}}{{k}^{2}1}\mathrm{ln}k=1$ The value of determining, i.e. k _{c}=2.2184574899167... (approximate value that comprises 2.2184574899167...).
 k≤

3. external pressure selfintensification cylinder according to claim 1 and designing and calculating thereof and manufacture method is characterized in that:
 the autofrettaged cylinder of pressing in the described feature of claim 1 is applicable to and is subjected to.

4. external pressure selfintensification cylinder according to claim 2 and designing and calculating thereof and manufacture method is characterized in that:
 the autofrettaged cylinder of pressing in the described feature of claim 2 is applicable to and is subjected to.
Specification(s)