CN112171377A - Method for prolonging fatigue life of thick-walled container with open hole in cylinder - Google Patents

Method for prolonging fatigue life of thick-walled container with open hole in cylinder Download PDF

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Publication number
CN112171377A
CN112171377A CN202010902346.6A CN202010902346A CN112171377A CN 112171377 A CN112171377 A CN 112171377A CN 202010902346 A CN202010902346 A CN 202010902346A CN 112171377 A CN112171377 A CN 112171377A
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thick
pressure
wall
opening
container
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危书涛
秦宗川
崔军
朱金花
范海俊
牛铮
姚佐权
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Hefei General Machinery Research Institute Special Equipment Inspection Station Co ltd
Hefei General Machinery Research Institute Co Ltd
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Hefei General Machinery Research Institute Special Equipment Inspection Station Co ltd
Hefei General Machinery Research Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12—Pressure testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • General Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

The invention discloses a method for prolonging the fatigue life of a thick-walled container with a cylindrical opening, which comprises the following steps A and/or B: step A, calculating to obtain the optimal self-reinforcing pressure P of the cylinder body of the thick-wall container under the condition of no hole openingAAnd before the cylinder is opened, the pressure P is self-intensified at optimum valueACarrying out self-enhancement treatment on the cylinder; step B, calculating the corresponding test pressure P when the local equivalent stress of the opening of the thick-wall container after the opening is minimumhAfter the subsequent processing of the opening of the thick-walled container, the pressure P is appliedhAnd carrying out pressure test on the part of the opening hole, so that the plastic deformation is formed on the part of the opening hole. The method utilizes the optimal self-reinforcing pressure obtained by calculation to carry out self-reinforcing treatment on the whole thick-wall container, and the opening is locally formed into plastic deformation through a pressure test, so that the inner wall generates local pressure stress, thereby prolonging the fatigue life; step A is carried out first, and step B is carried out again, so that the cylinder wall and the part of the open pore of the cylinder body are formed into a wholeThe fatigue life of the cylinder body is prolonged to the maximum extent due to the fixed compression residual stress.

Description

Method for prolonging fatigue life of thick-walled container with open hole in cylinder
Technical Field
The invention relates to the technical field of design and manufacture of thick-wall pressure containers, in particular to a method for prolonging the fatigue life of a thick-wall container with a hole in a cylinder.
Background
The thick-wall container is widely applied to the food and industrial fields of high-pressure sterilization/high-pressure polymerization and the like, is usually used for a pressure-bearing shell under the ultrahigh pressure working condition, and can bear higher pressure. For occasions with fatigue alternating working conditions, the thick-wall container is required to have enough fatigue strength life. Due to the requirement of process operation, holes with different sizes, such as a feed inlet/a discharge outlet/a temperature measuring port/a pressure measuring port, are often formed in the thick-wall container, and the holes formed in the container can cause local stress concentration, so that the stress level at the holes is obviously increased, the strength of the thick-wall container is reduced, and the fatigue life of the thick-wall container is shortened. At present, in the industry, under the condition of meeting process requirements, holes are usually arranged at the two end parts of a thick-wall container as much as possible, so that the holes are not formed in a thick-wall container cylinder, but if the process requirements cannot be avoided, the safety of the container can be ensured only by measures of improving the material strength, increasing the wall thickness or sacrificing the fatigue life of a part, and the like. Therefore, a design and manufacturing method for improving the overall fatigue life of the cylinder body open-pore thick-wall container is needed, a reference basis is provided for better design of the cylinder body open-pore thick-wall container, and the economical efficiency and the safety are improved.
Disclosure of Invention
In order to avoid and overcome the technical problems in the prior art, the invention provides a method for prolonging the fatigue life of a cylinder body open-hole thick-wall container. The invention carries out self-reinforcing treatment on the whole thick-wall container and leads the opening part to generate plastic deformation through a pressure test, thereby improving the fatigue life of the thick-wall container.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for improving the fatigue life of an open-pore thick-walled container of a cylinder body comprises the following steps A and/or B:
step A, calculating to obtain the optimal self-reinforcing pressure P of the cylinder body of the thick-wall container under the condition of no hole openingAAnd before the cylinder is opened, the pressure P is self-intensified at optimum valueACarrying out self-enhancement treatment on the cylinder;
step B, calculating the corresponding test pressure P when the local equivalent stress of the opening of the thick-wall container after the opening is minimumhAfter the subsequent processing of the opening of the thick-walled container, the pressure P is appliedhAnd carrying out pressure test on the part of the opening hole, so that the plastic deformation is formed on the part of the opening hole.
As a further scheme of the invention: in step A, the optimum self-intensification pressure
Figure BDA0002660186890000021
Wherein:
PAthe optimal self-reinforcing pressure of the cylinder body of the thick-wall container is in MPa;
σsthe yield strength of the thick-wall container material is expressed in MPa;
e is the elastic modulus of the thick-wall container material at normal temperature;
Etthe elastic modulus of the thick-wall container material at the design temperature is adopted;
p is the design pressure of the thick-wall container, and the unit is MPa;
k is the diameter ratio of the thick-wall container,
Figure BDA0002660186890000022
Dothe outer diameter of the thick-wall container is in mm;
Diis the inner diameter of a thick-wall container, and has the unit of mm。
As a still further scheme of the invention: in the step B, an elastic-plastic analysis method is adopted, finite element numerical modeling is carried out, the test pressure is used as an independent variable, the equivalent stress locally applied to the open hole is used as a dependent variable, and the test pressure P when the equivalent stress is minimum is obtained through optimization calculationh。
As a still further scheme of the invention: the pressure test is a hydrostatic test.
As a still further scheme of the invention: before the step A and/or the step B are carried out, the design condition of the thick-wall container is determined according to the process requirement, and the structure of the thick-wall container is designed according to the design condition.
As a still further scheme of the invention: when carrying out the structural design to thick wall container, the trompil part design is two continuous segmentation holes, and one section that is close to the barrel outer wall is cylindrical hole, and one section that is close to the barrel inner wall is the bell mouth, the bell mouth expands outward along keeping away from barrel outer wall direction gradually, and adopts the fillet transition between bell mouth and the barrel inner wall.
As a still further scheme of the invention: the parameters of the angle and the fillet radius of the tapered hole are obtained through finite element numerical modeling; and taking parameters such as the hole transition fillet radius, the taper hole angle and the like as independent variables, taking the hole local stress concentration coefficient as a dependent variable, and obtaining parameters of the fillet radius and the taper hole angle when the stress concentration coefficient is minimum through optimization calculation.
As a still further scheme of the invention: and (C) after the step (A) and/or the step (B) are carried out, finishing all manufacturing procedures before the opening of the cylinder body of the thick-wall container, processing the opening of the thick-wall container according to design requirements and a manufacturing process, and finishing the subsequent manufacturing procedures.
Compared with the prior art, the invention has the beneficial effects that:
1. the method utilizes the optimal self-reinforcing pressure obtained by calculation to carry out self-reinforcing treatment on the whole thick-wall container, and the opening is locally formed into plastic deformation through a pressure test, so that the inner wall generates local pressure stress, thereby prolonging the fatigue life; p is due to the local stress concentration in the poresh＜PATherefore, the original self-reinforcing state of the cylinder body cannot be changed after the small holes are locally self-reinforced, and the cylinder body is subjected to self-reinforcing in the step A and then is perforated, so that the local self-reinforcing residual stress of the perforated part can be released; and B, performing step A first and then performing step B to ensure that certain compressive residual stress is formed on the cylinder wall and the part of the opening of the cylinder body, thereby maximally improving the fatigue life of the cylinder body.
2. The invention reduces the stress level of the opening part and improves the fatigue life of the thick-wall container by adopting the special shape design of the conical hole and the arc section for the opening part.
3. The pressure test of the invention adopts a hydrostatic test, and the test safety is higher.
Drawings
FIG. 1 is a schematic sectional view of a thick-walled container according to the present invention after opening the opening.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: a method for prolonging the fatigue life of a thick-walled container with an open hole in a cylinder comprises the following steps:
and S1, determining the design conditions of the thick-wall container according to the process requirements, and carrying out structural design on the thick-wall container according to the design conditions.
In this step, the design conditions include the material, geometry, load, temperature and opening requirements of the thick-walled vessel, etc.; the mechanism design includes geometric dimension, end structure, sealing structure and opening shape, and the like, and the design of the opening shape is taken as an example: the trompil part design is two continuous segmentation holes, and one section that is close to the barrel outer wall is cylindrical hole, and one section that is close to the barrel inner wall is the bell mouth, and the bell mouth expands outward along keeping away from barrel outer wall direction gradually, and adopts the fillet transition between bell mouth and the barrel inner wall.
The geometrical parameters such as the fillet radius, the taper hole angle and the like are obtained through finite element numerical modeling, the parameters such as the opening transition fillet radius, the taper hole angle and the like are used as independent variables, the opening local stress concentration coefficient is used as a dependent variable, and the parameters of the fillet radius and the taper hole angle when the stress concentration coefficient is minimum are obtained through optimization calculation.
S2, calculating the optimal self-reinforcing pressure P of the cylinder of the thick-wall container under the condition of no hole openingA。
P in this stepAObtained by an optimal self-reinforcing pressure theoretical calculation formula,
optimum self-intensification pressure
Figure BDA0002660186890000041
Wherein:
PAthe optimal self-reinforcing pressure of the cylinder body of the thick-wall container is in MPa;
σsthe yield strength of the thick-wall container material is expressed in MPa;
e is the elastic modulus of the thick-wall container material at normal temperature;
Etthe elastic modulus of the thick-wall container material at the design temperature is adopted;
p is the design pressure of the thick-wall container, and the unit is MPa;
k is the diameter ratio of the thick-wall container,
Figure BDA0002660186890000051
Dothe outer diameter of the thick-wall container is in mm;
Diis the internal diameter of a thick-walled container in mm.
S3, calculating the corresponding test pressure P when the equivalent stress on the local part of the open hole of the thick-wall container after the open hole is minimumhAfter the subsequent processing of the opening of the thick-walled container, the pressure P is appliedhAnd carrying out pressure test on the part of the opening hole, so that the plastic deformation is formed on the part of the opening hole.
In the step, an elastic-plastic analysis method is adopted, finite element numerical modeling is carried out, the test pressure is used as an independent variable, the equivalent stress locally applied to the open hole is used as a dependent variable, and the test pressure P when the equivalent stress is minimum is obtained through optimization calculationh(ii) a The pressure test is preferably a hydrostatic test, although a pneumatic test is also possible; when the number of the holes is 1, taking the water pressure when the equivalent stress borne by the holes is the minimum as the subsequent test pressure; and when the number of the holes is more than or equal to 2, taking the water pressure when the equivalent stress borne by the whole plurality of holes is the minimum as the subsequent test pressure.
S4, obtaining the optimal self-reinforcing pressure P in the step S2AAnd carrying out self-reinforcing treatment on the cylinder.
And S5, opening the holes of the thick-wall container according to the design requirements and the manufacturing process.
S6 at test pressure P obtained in S3hAnd carrying out pressure test on the part of the opening hole, so that the plastic deformation is formed on the part of the opening hole.
The pressure test in this step is still preferably a hydrostatic test, although a pneumatic test is also possible.
And S7, finishing the subsequent manufacturing process.
It is noted that the step S3 may be performed before the step S2, or after the step S4.
Example 2: a method for prolonging the fatigue life of a thick-walled container with an open hole in a cylinder comprises the following steps:
and S1, determining the design conditions of the thick-wall container according to the process requirements, and carrying out structural design on the thick-wall container according to the design conditions.
In this step, the design conditions include the material, geometry, load, temperature and opening requirements of the thick-walled vessel, etc.; the mechanism design includes geometric dimension, end structure, sealing structure and opening shape, and the like, and the design of the opening shape is taken as an example: the trompil part design is two continuous segmentation holes, and one section that is close to the barrel outer wall is cylindrical hole, and one section that is close to the barrel inner wall is the bell mouth, and the bell mouth expands outward along keeping away from barrel outer wall direction gradually, and adopts the fillet transition between bell mouth and the barrel inner wall.
The geometrical parameters such as the fillet radius, the taper hole angle and the like are obtained through finite element numerical modeling, the parameters such as the opening transition fillet radius, the taper hole angle and the like are used as independent variables, the opening local stress concentration coefficient is used as a dependent variable, and the parameters of the fillet radius and the taper hole angle when the stress concentration coefficient is minimum are obtained through optimization calculation.
S2, calculating the optimal self-reinforcing pressure P of the cylinder of the thick-wall container under the condition of no hole openingA。
P in this stepAObtained by an optimal self-reinforcing pressure theoretical calculation formula,
optimum self-intensification pressure
Figure BDA0002660186890000061
Wherein:
PAthe optimal self-reinforcing pressure of the cylinder body of the thick-wall container is in MPa;
σsthe yield strength of the thick-wall container material is expressed in MPa;
e is the elastic modulus of the thick-wall container material at normal temperature;
Etthe elastic modulus of the thick-wall container material at the design temperature is adopted;
p is the design pressure of the thick-wall container, and the unit is MPa;
k is the diameter ratio of the thick-wall container,
Figure BDA0002660186890000062
Dothe outer diameter of the thick-wall container is in mm;
Diis the internal diameter of a thick-walled container in mm.
S3, obtaining the optimal self-reinforcing pressure P in the step S2AAnd carrying out self-reinforcing treatment on the cylinder.
And S4, opening the holes of the thick-wall container according to the design requirements and the manufacturing process.
And S5, finishing the subsequent manufacturing process.
Example 3: a method for prolonging the fatigue life of a thick-walled container with an open hole in a cylinder comprises the following steps:
and S1, determining the design conditions of the thick-wall container according to the process requirements, and carrying out structural design on the thick-wall container according to the design conditions.
In this step, the design conditions include the material, geometry, load, temperature and opening requirements of the thick-walled vessel, etc.; the mechanism design includes geometric dimension, end structure, sealing structure and opening shape, and the like, and the design of the opening shape is taken as an example: the trompil part design is two continuous segmentation holes, and one section that is close to the barrel outer wall is cylindrical hole, and one section that is close to the barrel inner wall is the bell mouth, and the bell mouth expands outward along keeping away from barrel outer wall direction gradually, and adopts the fillet transition between bell mouth and the barrel inner wall.
The geometrical parameters such as the fillet radius, the taper hole angle and the like are obtained through finite element numerical modeling, the parameters such as the opening transition fillet radius, the taper hole angle and the like are used as independent variables, the opening local stress concentration coefficient is used as a dependent variable, and the parameters of the fillet radius and the taper hole angle when the stress concentration coefficient is minimum are obtained through optimization calculation.
S2, calculating the corresponding test pressure P when the equivalent stress on the local part of the open hole of the thick-wall container after the open hole is minimumhAfter the subsequent processing of the opening of the thick-walled container, the pressure P is appliedhAnd carrying out pressure test on the part of the opening hole, so that the plastic deformation is formed on the part of the opening hole.
In the step, an elastic-plastic analysis method is adopted, finite element numerical modeling is carried out, the test pressure is used as an independent variable, the equivalent stress locally applied to the open hole is used as a dependent variable, and the test pressure P when the equivalent stress is minimum is obtained through optimization calculationh(ii) a The pressure test is preferably a hydrostatic test, although a pneumatic test is also possible; when the number of the holes is 1, taking the water pressure when the equivalent stress borne by the holes is the minimum as the subsequent test pressure; and when the number of the holes is more than or equal to 2, taking the water pressure when the equivalent stress borne by the whole plurality of holes is the minimum as the subsequent test pressure.
And S3, opening the holes of the thick-wall container according to the design requirements and the manufacturing process.
S4 at test pressure P obtained in S2hAnd carrying out pressure test on the part of the opening hole, so that the plastic deformation is formed on the part of the opening hole.
The pressure test in this step is still preferably a hydrostatic test, although a pneumatic test is also possible.
And S5, finishing the subsequent manufacturing process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. The method for improving the fatigue life of the open-pore thick-walled container of the cylinder body is characterized by comprising the following steps A and/or B:
step A, calculating to obtain the optimal self-reinforcing pressure P of the cylinder body of the thick-wall container under the condition of no hole openingAAnd before the cylinder is opened, the pressure P is self-intensified at optimum valueACarrying out self-enhancement treatment on the cylinder;
step B, calculating the corresponding test pressure P when the local equivalent stress of the opening of the thick-wall container after the opening is minimumhAfter the subsequent processing of the opening of the thick-walled container, the pressure P is appliedhAnd carrying out pressure test on the part of the opening hole, so that the plastic deformation is formed on the part of the opening hole.
2. The method for improving the fatigue life of the open-pore thick-walled container of the cylinder body as claimed in claim 1, wherein in the step A, the optimal self-reinforcing pressure is
Figure FDA0002660186880000011
Wherein:
PAthe optimal self-reinforcing pressure of the cylinder body of the thick-wall container is Mpa;
σsthe yield strength of the thick-wall container material is expressed in Mpa;
e is the elastic modulus of the thick-wall container material at normal temperature;
Etthe elastic modulus of the thick-wall container material at the design temperature is adopted;
p is the design pressure of the thick-wall container, and the unit is Mpa;
k is the diameter ratio of the thick-wall container,
Figure FDA0002660186880000012
Dothe outer diameter of the thick-wall container is in mm;
Diis the internal diameter of a thick-walled container in mm.
3. The method for improving the fatigue life of the open-pore thick-walled container of the cylinder body as claimed in claim 1, wherein in the step B, an elastoplastic analysis method is adopted, a finite element numerical modeling is adopted, a test pressure is used as an independent variable, an equivalent stress locally applied to the open pore is used as a dependent variable, and a test pressure P when the equivalent stress is minimum is obtained through optimization calculationh。
4. The method for improving the fatigue life of the open-pore thick-walled container of the cylinder body as claimed in claim 3, wherein the pressure test is a hydraulic pressure test.
5. The method for improving the fatigue life of the open-pore thick-walled container of the cylinder body as claimed in any one of claims 1 to 4, wherein before the step A and/or the step B, the design conditions of the thick-walled container are determined according to the process requirements, and the thick-walled container is structurally designed according to the design conditions.
6. The method for improving the fatigue life of the open-pore thick-walled container of the barrel body as claimed in claim 5, wherein when the thick-walled container is structurally designed, the open-pore part is designed into a continuous two-section hole, the section close to the outer wall of the barrel body is a cylindrical hole, the section close to the inner wall of the barrel body is a tapered hole, the tapered hole is gradually expanded in the direction away from the outer wall of the barrel body, and a fillet transition is adopted between the tapered hole and the inner wall of the barrel body.
7. The method for improving the fatigue life of the open-hole thick-wall container of the cylinder body as claimed in claim 6, wherein the parameters of the taper hole angle and the fillet radius are obtained by finite element numerical modeling; and taking parameters such as the hole transition fillet radius, the taper hole angle and the like as independent variables, taking the hole local stress concentration coefficient as a dependent variable, and obtaining parameters of the fillet radius and the taper hole angle when the stress concentration coefficient is minimum through optimization calculation.
8. The method for improving the fatigue life of the open-pore thick-walled container of the cylinder body as claimed in any one of claims 1 to 4, wherein after the step A and/or the step B, all manufacturing processes before the opening of the cylinder body of the thick-walled container are completed, the thick-walled container is opened according to design requirements and manufacturing processes, and the subsequent manufacturing processes are completed.
CN202010902346.6A 2020-09-01 2020-09-01 Method for prolonging fatigue life of thick-walled container with open hole in cylinder Pending CN112171377A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117464327A (en) * 2023-12-25 2024-01-30 中北大学 Method for prolonging fatigue life of hydrogen delivery pipe of 6061 aluminum alloy hydrogenation gun

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CN104122137A (en) * 2014-05-19 2014-10-29 合肥通用机械研究院 Life-based design method for fatigue strength of ultrahigh-pressure container
RU2572296C1 (en) * 2014-09-30 2016-01-10 Закрытое акционерное общество "Научно-производственное предприятие "Маштест" Stand for hydraulic test of container for fatigue life at low temperatures

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117464327A (en) * 2023-12-25 2024-01-30 中北大学 Method for prolonging fatigue life of hydrogen delivery pipe of 6061 aluminum alloy hydrogenation gun
CN117464327B (en) * 2023-12-25 2024-03-19 中北大学 Method for prolonging fatigue life of hydrogen delivery pipe of 6061 aluminum alloy hydrogenation gun

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