CN114461967A - Calculation method for buckling parameters of composite pipe internal expansion external buckling type joint - Google Patents

Calculation method for buckling parameters of composite pipe internal expansion external buckling type joint Download PDF

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CN114461967A
CN114461967A CN202210053503.XA CN202210053503A CN114461967A CN 114461967 A CN114461967 A CN 114461967A CN 202210053503 A CN202210053503 A CN 202210053503A CN 114461967 A CN114461967 A CN 114461967A
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buckling
composite pipe
type joint
external
expansion
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褚展鹏
冯金茂
陈江慧
霍福磊
刘跃明
金崇阳
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Linhai Weixing New Building Materials Co Ltd
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Linhai Weixing New Building Materials Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F16L13/16—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling the pipe joint consisting of overlapping extremities having mutually co-operating collars

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Abstract

The invention discloses a method for calculating buckling parameters of an internal-expansion external-buckling type joint of a composite pipe, which comprises the following steps: measuring and determining related calculation parameters; determining the compressibility epsilon of the material of the layersi(ii) a Integral deformation S of composite pipe in buckling process1Calculating the stress distribution of the inner teeth and the outer teeth; taking the stress distribution of the inner and outer teeth obtained by calculation as a distribution index, and taking the integral deformation S1Is distributed as the deformation S of the outer buckle2And internal expansion deformation amount S3(ii) a According to the deformation S of the outer buckle2And internal expansion deformation amount S3The invention ensures that the buckling process of the internal expansion and external buckling type does not depend on empirical design and repeated large amount of test verification work any more; meanwhile, the common failure modes of joint fleeing, slipping and the like of the composite pipe fitting can be greatly reduced, and the overall service life of the composite pipeline is prolonged.

Description

Calculation method for buckling parameters of composite pipe internal expansion external buckling type joint
Technical Field
The invention relates to the technical field of composite pipe connection processes, in particular to a method for calculating buckling parameters of an internal expansion and external buckling type joint of a composite pipe.
Background
At present in the oil field composite pipe field, to the form that composite pipe connects most adoption withhold the pipe fitting, wherein withhold the pipe fitting and divide into according to withholding the difference of form again: the inner expansion type, the outer buckle type and the inner expansion outer buckle type.
The crimping joints are connected in an interference fit mode in the three modes, wherein the magnitude of interference (crimping magnitude) is determined as a crucial step of the whole connection process, but due to the lack of a related methodology system, most of the crimping processes are mainly experienced, so that the situations of pipeline failure caused by the fact that the joints are broken off and slip finally exist. The main reason for this phenomenon is that the buckling process of the metal joint is not stable and reliable enough, the buckling mode is not ideal enough, and the buckling is not stable enough, that is, the reliability of the joint is not guaranteed, especially for the internal expansion and external buckling joint, two buckling processes of the internal expansion amount and the external buckling amount need to be determined, and a set of scientific buckling process calculation method is urgently needed.
Disclosure of Invention
Aiming at the problems in the process of buckling and pressing the pipe fitting, the invention aims to provide a method for calculating buckling and pressing parameters of an internal and external buckling type joint of a composite pipe.
In order to achieve the purpose, the following technical scheme is provided:
a method for calculating buckling parameters of a composite pipe internal expansion external buckling type joint comprises the following steps:
1) measuring and determining relevant calculation parameters;
2) determining the maximum compression rate epsilon of each structural layer material of the composite pipe based on the calculation parametersi；
3) Calculating the integral deformation S of the composite pipe in the buckling process based on the formula (1)1，
Figure BDA0003475271850000021
N in the formula (1) is the number of the structural layers of the composite pipe, hiThe thickness of the structural layer corresponding to i;
4) calculating stress distribution sigma of inner and outer teethe；
5) With said stress distribution σeUsing the total deformation S calculated in step 3) as an allocation index1Is distributed as the deformation S of the outer buckle2And internal expansion deformation amount S3；
6) According to the deformation S of the outer buckle2And internal expansion deformation amount S3Calculating the external buckling quantity M of the assembly based on a formula (2), calculating the internal expansion quantity N of the assembly based on a formula (3),
M＝L1+L3+S2(2)；
N＝L2+L4+S3(3)；
in the formula L1Is the distance L between the outer diameter of the composite pipe and the outer tooth tip of the inner expansion outer buckle type joint2Is the distance L between the inner diameter of the composite pipe and the tooth tips of the inner teeth of the inner expansion outer buckle type joint3Depth of tooth, L, of external teeth for internally expanding and externally buckling type joint4The depth of the inner teeth of the internal expansion external buckle type joint.
Further, the calculation parameters in the step 1) comprise the thickness h of each structural layer of the composite pipeiAnd density ρiInner diameter r of internally-expanded externally-buckled joint1And outer diameter r2The distance L between the outer diameter of the composite pipe and the tooth tip of the outer tooth of the inner expansion outer buckle type joint1The distance L between the inner diameter of the composite pipe and the tooth tips of the inner teeth of the inner expansion outer buckle type joint2Nominal pressure P of composite pipenInner expansion outer buckle type joint outer tooth depth L3Inner tooth depth L of inner expansion outer buckle type joint4And the yield strength of the materials of the layers of the composite tube
Figure BDA0003475271850000022
Further, the maximum compression ratio εiThe calculation formula of (2) is as follows:
Figure BDA0003475271850000031
in the formula, mu represents the design safety factor,
Figure BDA0003475271850000032
represents the yield strength, rho, of each structural layer material of the composite pipeiThe density of each structural layer of the composite pipe is shown.
Further, the calculation formula of the design safety factor is as follows:
μ＝a×b，
the a represents the use condition, the cycle condition is 0.75, the stable condition is 0.85, the cycle condition represents the condition that the pressure in the composite pipe changes, the stable condition represents the condition that the pressure in the composite pipe is stable and unchanged, the b represents the reinforcing form of the composite pipe, the adhesive composite pipe is 0.95, and the non-adhesive composite pipe is 0.85.
Further, the stress distribution σ of the inner and outer teeth in step 4)eThe calculation formula is as follows:
Figure BDA0003475271850000033
Figure BDA0003475271850000034
Figure BDA0003475271850000035
Figure BDA0003475271850000036
in the formula: r is the distance of the internal tooth tip or the external tooth tip from the central axis of the pipe, r1Is the inner diameter r of the internally-expanded externally-buckled joint2Is an external diameter of an internally-expanded externally-buckled joint, PnIs the nominal pressure, σ, of the composite tubeθRepresenting hoop stress, σrDenotes radial stress, σxAxial stress is indicated.
Further, the calculation mode of the step 5) is
Figure BDA0003475271850000037
S3＝S1-S2
Wherein
Figure BDA0003475271850000041
Representing the equivalent stress at the outer teeth,
Figure BDA0003475271850000042
representing the equivalent stress at the inner teeth.
Further, the value range of n is 3-5.
Furthermore, the outer diameter of the composite pipe is 40 mm-90 mm.
The invention has the beneficial effects that: the internal expansion and external buckling type buckling and pressing process does not depend on empirical design and repeated large amount of test verification work any more; meanwhile, the common failure modes of joint fleeing, slipping and the like of the composite pipe fitting can be greatly reduced, and the overall service life of the composite pipeline is prolonged.
Drawings
Fig. 1 is a schematic view of a composite tube internal expansion external buckle type joint suitable for the invention.
Detailed Description
The invention is further illustrated by the following examples, without restricting its scope.
The connection of the internal expansion external buckle type joint and the composite pipe is shown in figure 1.
Example 1
For a composite pipe with an internal diameter of 55mm, PnThe steel wire reinforced composite pipe with the pressure of 8MPa and the pressure of n 3 adopts a pipe fitting connection mode of inner expansion and outer buckling, and the concrete steps of the buckling and pressing process are as follows:
(1) determining parameters for calculation
Figure BDA0003475271850000043
Figure BDA0003475271850000051
(2) Determining compressibility of layers of material
Respectively substituting the determined parameters into the following formulas
Figure BDA0003475271850000052
Sequentially obtaining the maximum compression ratios of the materials of all layers as epsilon1＝ε3＝0.28，ε2＝0.09，
And under a stable working condition, the adhesive composite pipe.
(3) Calculating the overall deformation
Substituting the compressibility obtained in step 2) and the thickness of each layer obtained in step 1) into the following formula
Figure BDA0003475271850000053
Calculating to obtain the integral deformation S1＝2.4mm
(4) Calculating stress distribution of inner and outer teeth
Will r is1＝50mm，r278mm, r is the internal diameter of the pipe/2-L1When the distance between the internal teeth and the central axis is 27.3mm, the following equation is substituted
Figure BDA0003475271850000054
Figure BDA0003475271850000055
Figure BDA0003475271850000056
Figure BDA0003475271850000057
Calculating to obtain the equivalent stress at the internal teeth
Figure BDA0003475271850000061
Will r is1＝50mm，r278mm, r is the pipe external diameter/2 + L237.7mm (distance of the outer teeth from the central axis), and equivalent stress at the outer teeth can be obtained in the formula
Figure BDA0003475271850000062
(5) Distribution of internal and external deformation
Substituting the above result into the following formula
Figure BDA0003475271850000063
S3＝S1-S2
Obtaining the deformation S of the outer buckle20.7mm, and the external and internal expansion deformation amount S3＝1.7mm；
(6) Output buckling process
The external buckling quantity M is 0.7+0.2+ 1.2-2.1 mm
Internal expansion N is 1.7+0.2+1.5 is 3.4mm
In summary for DN＝55mm，PnThe pipe fitting and the pipe fitting can be ensured to be connected with enough axial connection and annular connection strength by adopting a buckling and pressing process of externally buckling 2.1mm and internally expanding 3.4mm for the pipe fitting with 8 MPa.

Claims (8)

1. A method for calculating buckling parameters of a composite pipe internal expansion external buckling type joint is characterized by comprising the following steps:
1) measuring and determining relevant calculation parameters;
2) determining the maximum compression rate epsilon of each structural layer material of the composite pipe based on the calculation parametersi；
3) Composite pipe in buckling process based on formula (1)Overall deformation amount S of1，
Figure FDA0003475271840000011
N in the formula (1) is the number of the structural layers of the composite pipe, hiThe thickness of the structural layer corresponding to i;
4) calculating stress distribution sigma of inner and outer teethe；
5) With said stress distribution σeUsing the total deformation S calculated in step 3) as an allocation index1Is distributed as the deformation S of the outer buckle2And internal expansion deformation amount S3；
6) According to the deformation S of the outer buckle2And internal expansion deformation amount S3Calculating the external buckling quantity M of the assembly based on a formula (2), calculating the internal expansion quantity N of the assembly based on a formula (3),
M＝L1+L3+S2 (2)；
N＝L2+L4+S3 (3)；
in the formula L1Is the distance L between the outer diameter of the composite pipe and the outer tooth tip of the inner expansion outer buckle type joint2Is the distance L between the inner diameter of the composite pipe and the tooth tips of the inner teeth of the inner expansion outer buckle type joint3Depth of tooth, L, of external teeth for internally expanding and externally buckling type joint4The depth of the inner teeth of the internal expansion external buckle type joint.
2. The method of claim 1, wherein the calculated parameters of step 1) include the thickness h of each structural layer of the composite pipeiAnd density ρiInner diameter r of internally-expanded externally-buckled joint1And outer diameter r2The distance L between the outer diameter of the composite pipe and the tooth tip of the outer tooth of the inner expansion outer buckle type joint1The distance L between the inner diameter of the composite pipe and the tooth tips of the inner teeth of the inner expansion outer buckle type joint2Nominal pressure P of composite pipenInner expansion outer buckle type joint outer tooth depth L3Inner tooth depth L of inner expansion outer buckle type joint4And the yield strength of the materials of the layers of the composite tube
Figure FDA0003475271840000026
3. The method of claim 1, wherein the maximum compressibility ∈ is calculated by calculating the buckling parameter of the male buckle type joint inside the composite tubeiThe calculation formula of (2) is as follows:
Figure FDA0003475271840000021
in the formula, mu represents the design safety factor,
Figure FDA0003475271840000025
represents the yield strength, rho, of each structural layer material of the composite pipeiThe density of each structural layer of the composite pipe is shown.
4. The method for calculating the buckling parameters of the composite pipe internal expansion external buckling type joint as claimed in claim 3, wherein the calculation formula of the design safety factor is as follows:
μ＝a×b，
the a represents the use condition, the cycle condition is 0.75, the stable condition is 0.85, the b represents the reinforced form of the composite pipe, the adhesive composite pipe is 0.95, and the non-adhesive composite pipe is 0.85.
5. The method for calculating the buckling parameters of the composite tube internal-expansion and external-buckling type joint according to claim 1, wherein the stress distribution σ of the internal and external teeth in the step 4)eThe calculation formula is as follows:
Figure FDA0003475271840000022
Figure FDA0003475271840000023
Figure FDA0003475271840000024
Figure FDA0003475271840000031
in the formula: r is the distance of the internal tooth tip or the external tooth tip from the central axis of the pipe, r1Is the inner diameter r of the internally-expanded externally-buckled joint2Is an external diameter of an internally-expanded externally-buckled joint, PnIs the nominal pressure, σ, of the composite tubeθRepresenting hoop stress, σrDenotes radial stress, σxAxial stress is indicated.
6. The method for calculating the buckling parameters of the composite tube internal expansion and external buckling type joint according to claim 1, wherein the calculation mode of the step 5) is that
Figure FDA0003475271840000032
S3＝S1-S2
Wherein
Figure FDA0003475271840000033
Representing the equivalent stress at the outer teeth,
Figure FDA0003475271840000034
representing the equivalent stress at the inner teeth.
7. The method for calculating the buckling parameters of the composite pipe internal expansion and external buckling type joint according to claim 1, wherein the value of n ranges from 3 to 5.
8. The method for calculating the buckling parameters of the internally and externally buckled and buckled composite pipe joint according to claim 1, wherein the outer diameter of the composite pipe is 40mm to 90 mm.
CN202210053503.XA 2022-01-18 2022-01-18 Calculation method for buckling parameters of composite pipe internal expansion external buckling type joint Pending CN114461967A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040225044A1 (en) * 1994-04-19 2004-11-11 Chen John Y. Tear resistant adherent gels, composites, and articles
CN102980910A (en) * 2012-11-30 2013-03-20 深圳市博恩实业有限公司 Heat conduction material property testing equipment
CN113833480A (en) * 2021-09-29 2021-12-24 成都建工第九建筑工程有限公司 Shield initial tunneling and arrival construction method
CN113849996A (en) * 2021-09-14 2021-12-28 临海伟星新型建材有限公司 Method for calculating reducing amount of ultra-high molecular weight polyethylene lining pipe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040225044A1 (en) * 1994-04-19 2004-11-11 Chen John Y. Tear resistant adherent gels, composites, and articles
CN102980910A (en) * 2012-11-30 2013-03-20 深圳市博恩实业有限公司 Heat conduction material property testing equipment
CN113849996A (en) * 2021-09-14 2021-12-28 临海伟星新型建材有限公司 Method for calculating reducing amount of ultra-high molecular weight polyethylene lining pipe
CN113833480A (en) * 2021-09-29 2021-12-24 成都建工第九建筑工程有限公司 Shield initial tunneling and arrival construction method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李平: "油气输送用粘接热塑性复合管截面强度及专用接头优化设计计算", 中国优秀硕士学位论文全文数据库工程科技Ⅰ辑, no. 2, 15 February 2021 (2021-02-15), pages 019 - 881 *

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