CN109284570A - A kind of stress assessment method and stress assessment system - Google Patents
A kind of stress assessment method and stress assessment system Download PDFInfo
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- CN109284570A CN109284570A CN201811218297.3A CN201811218297A CN109284570A CN 109284570 A CN109284570 A CN 109284570A CN 201811218297 A CN201811218297 A CN 201811218297A CN 109284570 A CN109284570 A CN 109284570A
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- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The present invention discloses a kind of stress assessment method and stress assessment system.The present invention is first according to each components of stress for determining synthesis primary stress at a distance from the characteristic parameter and the corresponding position of each load contribution to each evaluation path for taking over the load composition, adapter tube that cause primary stress in shell join domain；Then three-dimensional principal stress is determined according to each components of stress, and the calculating stress intensity of primary stress is determined according to three-dimensional principal stress；Primary stress evaluation is finally carried out according to the join domain of the corresponding material allowable stress in position in evaluation path and calculating stress intensity butt tube and shell.The present invention accordingly evaluates difference stress composition caused by different loads, while capable of effectively ensuring pressure vessel intensity qualification using dangerous path as evaluation path, moreover it is possible to unnecessary cost be avoided to improve.On this basis, in conjunction with the primary plus secondary stress evaluation of adapter tube and shell join domain, moreover it is possible to guarantee the stability of pressure vessel.
Description
Technical field
The present invention relates to pressure vessel fields, more particularly to a kind of stress assessment method and stress assessment system.
Background technique
Pressure vessel is widely used in petrochemical industry, energy source and power, in Oil & Gas Storage and thermoelectricity and nuclear power generating equipment,
The connection of middle adapter tube and shell is a kind of typical structure, for this position frequently with the finite element stress analysis software such as Ansys
Analytical calculation is carried out, stress evaluation then is carried out to this position by base allowable stress intensity, that is, allowable value as defined in standard.
Since adapter tube and shell bonding pad are discontinuous structure, finite element stress analysis software be cannot distinguish between in calculated result
The film of extraction adds primary stress in bending stress and secondary stress composition, if adding bending stress according to once answering film
Power intensity is evaluated (allowable stress that limit value is 1.5 times), will lead to the final thickness choosing of equipment greater than needed for, waste is tight
Weight；If evaluated (allowable stress that limit value is 3 times) according to secondary stress intensity, and primary stress leakage is commented, so that
Calculating structure is dangerous, and actual product is easy to happen safety accident.It there is no safe treating method at present, many times only roll over
In 2.2 times of allowable stress of use as evaluation criteria, without theoretical foundation, cause a part to set using such processing method
Standby thickness is excessive, and unnecessary cost is caused to improve, and on the other hand, it is also possible to it causes a part of device thickness insufficient, there is production
The danger of raw Strength Failure.
Summary of the invention
The object of the present invention is to provide a kind of stress assessment method and stress assessment systems, can effectively ensure pressure vessel
While intensity qualification, moreover it is possible to avoid unnecessary cost from improving, be answered in conjunction with adapter tube and the primary plus secondary of shell join domain
After power evaluation, moreover it is possible to further increase the security performance of pressure vessel.
To achieve the above object, the present invention provides following schemes:
A kind of stress assessment method of Nozzle Zone of Vessels and shell join domain, the stress assessment method include:
According to the mean radius of shell, shell opening diameter and adapter tube and shell between knuckle radius determine aperture
Reinforcement region；
Evaluation path is determined according to the envelope range of the dangerous working condition of pressure vessel；
The load composition for causing primary stress is determined according to the position in the reinforcement for openings region and the evaluation path；
According to the load composition, the characteristic parameter of the adapter tube and the corresponding position of each load contribution described in
The distance for evaluating path determines each components of stress for synthesizing the primary stress；
Three-dimensional principal stress is determined according to each components of stress；
The calculating stress intensity of the primary stress is determined according to the three-dimensional principal stress；
It is once answered according to the corresponding material allowable stress in position in the evaluation path and the calculating stress intensity
Power evaluation.
Optionally, the corresponding material allowable stress in position according to the evaluation path and the calculating stress intensity
After progress primary stress evaluation, further includes:
Establish the finite element model of pressure vessel；
The software stress of the finite element model is calculated using finite element analysis software；
To it is each it is described evaluation path on the software stress carry out Stress Linearization processing, obtain it is described adapter tube with it is described
The bending stress of the join domain of shell；
It is carried out according to the corresponding material allowable stress in position in the evaluation path and the bending stress once plus secondary
Stress evaluation.
Optionally, the characteristic parameter of the adapter tube includes: adapter tube internal diameter, adapter tube outer diameter, adapter tube wall thickness, adapter tube section face
At least one of product, adapter tube Torsion Section coefficient and adapter tube bending resistant section coefficient.
Optionally, the calculating stress intensity that the primary stress is determined according to the three-dimensional principal stress, specifically includes:
According to each three-dimensional principal stress, the stress for calculating each evaluation path using Mises yield criterion is strong
Degree；
The calculating stress intensity that maximum stress intensity is denoted as the primary stress is filtered out from each stress intensity.
A kind of stress assessment system of Nozzle Zone of Vessels and shell join domain, the stress assessment system include:
Reinforcement area determination module, for according to the mean radius of shell, the opening diameter of shell and adapter tube and shell
Between knuckle radius determine reinforcement for openings region；
Path determination module is evaluated, the envelope range for the dangerous working condition according to pressure vessel determines evaluation path；
Load composition determining module, for being caused according to the position determination in the reinforcement for openings region and the evaluation path
The load composition of primary stress；
Components of stress determining module, for according to the load composition, the adapter tube characteristic parameter and each load
The distance in the corresponding position of ingredient to the evaluation path determines each components of stress for synthesizing the primary stress；
Three-dimensional principal stress determining module, for determining three-dimensional principal stress according to each components of stress；
Stress intensity determining module is calculated, for determining the calculating stress of the primary stress according to the three-dimensional principal stress
Intensity；
Primary stress assessment module, by according to it is described evaluation path the corresponding material allowable stress in position and it is described based on
It calculates stress intensity and carries out primary stress evaluation.
Optionally, the stress assessment system further include:
Finite element model establishes module, for establishing the finite element model of pressure vessel；
Software stress calculation module, for calculating the software stress of the finite element model using finite element analysis software；
Bending stress determining module, for being carried out at Stress Linearization to the software stress on each evaluation path
Reason obtains the bending stress of the adapter tube and the join domain of the shell；
Once plus secondary stress assessment module, for according to it is described evaluation path the corresponding material allowable stress in position and
The bending stress carries out once plus secondary stress is evaluated.
Optionally, the characteristic parameter of the adapter tube includes: adapter tube internal diameter, adapter tube outer diameter, adapter tube wall thickness, adapter tube section face
At least one of product, adapter tube Torsion Section coefficient and adapter tube bending resistant section coefficient.
Optionally, the calculating stress intensity determining module includes:
Stress intensity determination unit, for being calculated using Mises yield criterion each according to each three-dimensional principal stress
The stress intensity in the evaluation path；
Screening unit is denoted as the primary stress for filtering out maximum stress intensity from each stress intensity
Calculate stress intensity.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The stress assessment method and system of Nozzle Zone of Vessels provided by the invention and shell join domain, first according to pressure
Cause the load composition of primary stress, the characteristic parameter of adapter tube and each load contribution pair in force container adapter tube and shell join domain
The distance in the position answered to each evaluation path determines each components of stress of synthesis primary stress；Then according to each stress point
It measures and determines three-dimensional principal stress, and determine the calculating stress intensity of primary stress according to three-dimensional principal stress；Finally according to evaluation path
The corresponding material allowable stress in position and calculate the join domain of stress intensity butt tube and shell and carry out primary stress evaluation.
As it can be seen that the present invention is classified and is carried out to difference stress composition caused by different loads using dangerous path as evaluation path
Corresponding evaluation, while capable of effectively ensuring pressure vessel intensity qualification, moreover it is possible to unnecessary cost be avoided to improve.
On this basis, in conjunction with the primary plus secondary stress evaluation of adapter tube and shell join domain, moreover it is possible to guarantee that pressure is held
The stability of device makes it that new plastic deformation not occur under the alternate load effect of limited times, to further improve pressure
The security performance of force container.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the stress assessment method of a kind of Nozzle Zone of Vessels and shell join domain provided in an embodiment of the present invention
Flow chart；
Fig. 2 is the stress assessment system of a kind of Nozzle Zone of Vessels and shell join domain provided in an embodiment of the present invention
Structural block diagram；
Fig. 3 is structure provided in an embodiment of the present invention and path schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of stress assessment method and stress assessment systems, can effectively ensure pressure vessel
While intensity qualification, moreover it is possible to avoid unnecessary cost from improving, be answered in conjunction with adapter tube and the primary plus secondary of shell join domain
After power evaluation, moreover it is possible to further increase the security performance of pressure vessel.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the stress assessment method of a kind of Nozzle Zone of Vessels and shell join domain provided in an embodiment of the present invention
Flow chart.As shown in Figure 1, the stress assessment method of a kind of Nozzle Zone of Vessels and shell join domain, the stress evaluation side
Method includes:
Step 101: according to the mean radius of shell, shell opening diameter and adapter tube and shell between knuckle radius
Determine reinforcement for openings region.
Step 102: evaluation path is determined according to the envelope range of the dangerous working condition of pressure vessel.
Step 103: the load for causing primary stress is determined according to the position in the reinforcement for openings region and the evaluation path
Lotus composition, and determine the type of the primary stress generated.
Step 104: according to the load composition, the characteristic parameter of the adapter tube and the corresponding effect of each load contribution
The distance in point to the evaluation path determines each components of stress for synthesizing the primary stress.The characteristic parameter packet of the adapter tube
It includes: adapter tube internal diameter, adapter tube outer diameter, adapter tube wall thickness, adapter tube area of section, adapter tube Torsion Section coefficient and adapter tube bending resistant section system
Number.
Step 105: determining three-dimensional principal stress according to each components of stress.
Step 106: the calculating stress intensity of the primary stress is determined according to the three-dimensional principal stress, is specifically included:
According to each three-dimensional principal stress, the stress for calculating each evaluation path using Mises yield criterion is strong
Degree；
The calculating stress intensity that maximum stress intensity is denoted as the primary stress is filtered out from each stress intensity.
Step 107: according to it is described evaluation path the corresponding material allowable stress in position and the calculating stress intensity into
The evaluation of row primary stress.
Step 108: establishing the finite element model of pressure vessel.
Step 109: the software stress of the finite element model is calculated using finite element analysis software.
Step 110: Stress Linearization processing being carried out to the software stress on each evaluation path, is connect described in acquisition
The bending stress of pipe and the join domain of the shell.
Step 111: carrying out one according to the corresponding material allowable stress in position in the evaluation path and the bending stress
The evaluation of secondary plus secondary stress.
Fig. 2 is the stress assessment system of a kind of Nozzle Zone of Vessels and shell join domain provided in an embodiment of the present invention
Structural block diagram.As shown in Fig. 2, the stress assessment system of a kind of Nozzle Zone of Vessels and shell join domain, the stress evaluation
System includes:
Reinforcement area determination module 201, for according to the mean radius of shell, the opening diameter of shell and adapter tube and shell
Knuckle radius between body determines reinforcement for openings region.
Path determination module 202 is evaluated, the envelope range for the dangerous working condition according to pressure vessel determines evaluation path.
Load composition determining module 203, for being determined according to the position in the reinforcement for openings region and the evaluation path
Cause the load composition of primary stress.
Components of stress determining module 204, for according to the load composition, the adapter tube characteristic parameter and each load
The distance in the corresponding position of lotus ingredient to the evaluation path determines each components of stress for synthesizing the primary stress.It is described
The characteristic parameter of adapter tube include: adapter tube internal diameter, adapter tube outer diameter, adapter tube wall thickness, adapter tube area of section, adapter tube Torsion Section coefficient and
Adapter tube bending resistant section coefficient.
Three-dimensional principal stress determining module 205, for determining three-dimensional principal stress according to each components of stress.
Stress intensity determining module 206 is calculated, for determining the calculating of the primary stress according to the three-dimensional principal stress
Stress intensity.
Specifically, the calculating stress intensity determining module 206 includes:
Stress intensity determination unit, for being calculated using Mises yield criterion each according to each three-dimensional principal stress
The stress intensity in the evaluation path；
Screening unit is denoted as the primary stress for filtering out maximum stress intensity from each stress intensity
Calculate stress intensity.
Primary stress assessment module 207, for according to the corresponding material allowable stress in position for evaluating path and institute
It states and calculates stress intensity progress primary stress evaluation.
Finite element model establishes module 208, for establishing the finite element model of pressure vessel.
Software stress calculation module 209, the software for calculating the finite element model using finite element analysis software are answered
Power.
Bending stress determining module 210, it is linear for carrying out stress to the software stress on each evaluation path
Change processing obtains the bending stress of the adapter tube and the join domain of the shell.
Once add secondary stress assessment module 211, for answering according to the corresponding material in position for evaluating path is allowable
Power and the bending stress carry out once plus secondary stress is evaluated.
The stress assessment system of Nozzle Zone of Vessels provided by the invention and shell join domain, butt tube are connected with shell
Region carries out primary stress evaluation respectively according to stress types and once adds secondary stress evaluation, solves pressure in the prior art
Container cost is excessively high or has the problem of failure risk, and specific implementation process is as follows:
1, the knuckle radius between mean radius, opening diameter and adapter tube and the shell of shell is obtained, and according to described
Mean radius, the opening diameter and the knuckle radius determine reinforcement for openings region.
Wherein, the width along the reinforcement for openings region of shell axial direction is 2d, i.e. the width in unilateral reinforcement for openings region
It is calculated as follows for d, the width L along the reinforcement region of shell radial direction:
Wherein, rmIndicate shell mean radius, unit mm；tnIndicate the mean radius of shell, unit mm；r2It indicates
Knuckle radius between adapter tube and container, unit mm.
D indicates that the width in axial unilateral reinforcement region, the width d in axial unilateral side reinforcement region are equal to opening diameter, unit
For mm.
2, according to the envelope range of dangerous working condition, specified needs is chosen in the different zones of the adapter tube and the shell and are commented
Fixed path, i.e. evaluation path.
Fig. 3 is structure provided in an embodiment of the present invention and path schematic diagram.As shown in figure 3, the present embodiment is by reinforcement for openings
Continuous place (ASN1) outside regional scope and discontinuous place (ASN2, ASN3), at the shape mutation in reinforcement for openings regional scope
The commissure (ASN7) of (ASN4, ASN5, ASN6) and different materials is determined as evaluating path, and the path of these positions can wrap
All dangerous working conditions of network and position.
3, the position in the evaluation path chosen according to step 2, based on the reinforcement region that step 1 determines, determination causes
The type of the primary stress of the load composition and generation of primary stress.
Path (ASN1~ASN3) outside reinforcement for openings region, a membrane stress are that the totality film as caused by pressure is answered
The combination for the mean stress that power and the axial force being externally applied on adapter tube, shearing, torque generate on adapter tube；For continuous
The path (ASN1) at place, this membrane stress make primary general membrane stress (Pm) processing, as there is knot at selected position
Structure is discontinuous (ASN2, ASN3), then membrane stress herein will be considered as a local membrane stress PL.Primary bending stress
PbIt is not required to individually evaluate and is also just not required to individually calculate, but to it with membrane stress and value is needed to be defined.(Pm+Pb)
Or (PL+Pb) it is by above-mentioned PmOr PLIn addition by the generated bending stress P of moment of flexure and shearing of outside applicationb(including thermic load
The outer tube moment of flexure of generation).This step is labeled as M.
Path (ASN4~ASN6) in reinforcement for openings region should limit P due to being in locus of discontinuitymIt limits again
PL, and P hereinbHarm and PLUnanimously, and limit value is also consistent, therefore does not calculate P individuallyb.It is answered by the overall film that pressure generates
Power, in addition being generated by external applied load and moment of face (generating outer tube load including thermic load) other than uncontinuous stress
Stress intensity, sum of the two can incorporate into as Pm.By internal pressure and outer tube load (including thermic load generates outer tube load)
A caused local membrane stress PLIt is extracted using finite element analysis software, i.e., the membrane stress individually extracted on path is
Local membrane stress PL.This step is labeled as N.
In step 3, the path (ASN7) of commissure, positioned at the commissure of adapter tube and shell, a monolithic film membrane stress Pm
It is to be generated by internal pressure.The primary part as caused by internal pressure and outer tube load (including thermic load generates outer tube load)
Membrane stress PLIt is extracted using finite element analysis software, i.e., the membrane stress individually extracted on path is that a partial thin film is answered
Power PL.This step is labeled as O.
4, the load composition determined according to step 3, it is anti-according to adapter tube internal-and external diameter, adapter tube wall thickness, adapter tube area of section, adapter tube
Section factor, adapter tube bending resistant section coefficient and the corresponding position of each load contribution is turned round to come to parameters such as the distances in evaluation path
Calculate each components of stress for synthesizing final primary stress.
It marks in M step, Pm/PLComponents of stress calculation formula it is as follows:
(Pm+Pb) and (PL+Pb) components of stress calculation formula it is as follows:
Note: 2 of calculation formula are not listed in 6 components of stress as zero-valued entries.
In formula, σAIndicate axial stress, σHIndicate circumference stress, σRIndicate radial stress, τHAIndicate that shear stress, P indicate
Internal pressure, unit MPa, RiIndicate adapter tube internal diameter, unit mm, RoIndicate that adapter tube outer diameter, unit mm, t indicate adapter tube minimal wall
Thickness, unit mm, N indicate axle power, and unit N, V indicate that shearing, unit N, M indicate moment of flexure, and unit Nmm, T expression is turned round
Square, unit Nmm, RmIndicate adapter tube mean radius, unit mm, A indicate area of section, unit mm2, J indicates antitorque section
Face coefficient, unit mm4。
Mark P in N stepmComponents of stress calculation formula is as follows:
Note: 2 of calculation formula are not listed in 6 components of stress as zero-valued entries.
Wherein, σAIndicate axial stress, σHIndicate circumference stress, σRIndicate radial stress, P indicates pressure loading, and unit is
MPa, Ri' indicate shell inside radius, unit mm.
It marks in O step, PmComponents of stress calculation formula is as follows, PmIndicate the mean stress on thickness direction, σHIndicate ring
To stress, t ' expression shell minimum wall thickness (MINI W.), unit mm.
Note: 2 of calculation formula are not listed in 6 components of stress as zero-valued entries.
5, three-dimensional principal stress σ is calculated using each components of stress that step 4 is calculated1、σ2And σ3, calculation formula is shown in
Table 1.
6, the three-dimensional principal stress for calculating step 5 is bent using the meter Sai Si of third strength theory (maximum shear stress theory)
It takes criterion and calculates the stress intensity in each evaluation path, and choose calculating stress intensity of the maximum value as final primary stress,
Specific formula for calculation is shown in Table 1.
1 three-dimensional principal stress of table and stress intensity computational chart
Wherein, σ1Indicate first principal stress, σ2Indicate second principal stress, σ3Indicate third principal stress, σ12Indicate σ1With
σ2Difference, σ23Indicate σ2With σ3Difference, σ31Indicate σ3With σ1Difference.
7, according to itself intrinsic base allowable stress intensity (i.e. allowable stress S of component materials where evaluation pathm), according to
Limit value specified in the codes and standards of practical application, to the calculating stress intensity for the primary stress that step 6 calculates, by different classifications
Different coefficients is selected to carry out primary stress evaluation.
The evaluation of primary stress, for PmClass stress without self limiting, therefore presses one times since its coverage is larger
Base allowable stress intensity SmIt is evaluated, that is, the P being calculatedmValue is not greater than the S of equipment selected materialsmValue.For PLClass is answered
Power, since its coverage is smaller, by 1.5 times of SmValue is evaluated.And Pm+PbIt is influenced by nozzle dimensions, limit value allowable
For α Sm, wherein being calculated as follows for α form factor:
Wherein, RwIndicate adapter tube outer radius, RnIndicate adapter tube inside radius.
8, integrated stress calculating is carried out to pressure vessel using ANSYS finite element analysis software, in the evaluation that step 2 determines
Stress Linearization is carried out on path, obtains film adds bending stress and value.This is a monolithic film membrane stress P with valuem, once
Local membrane stress PL, secondary membrane stress, primary bending stress and second order buckling stress and value, but cannot distinguish between each self-contained
Amount.Since secondary stress Q will not be independently of primary stress P individualism, and secondary stress Q independent role does not have equipment and component
It is harmful, it is only superimposed upon on the basis of primary stress P, can just cause stability problem.This calculated value includes once to add secondary answer
The all the components of power intensity (P+Q) are evaluated using foundation identical with step 7, but need to select and be for P+Q limit value
Number.It further, can also be from the membrane stress extracted in calculated result on each evaluation path, for succeeding marker N and label O
Local membrane stress P of middle determinationL。
In order to guarantee that equipment keeps stability under the action of alternating load, need to comment the P+Q described in step 8
Fixed, " bending stress " extracted from ANSYS calculated result both includes primary stress composition in this, also comprising secondary stress at
Part, i.e. P+Q is needed to this calculated value by 3SmIt is evaluated.It is thin to the part linearized on (ASN4~ASN7) simultaneously
Membrane stress PLBy 1.5 times of SmValue is evaluated.
If 9, the evaluation result of step 7 and step 8 is unsatisfactory for evaluation limit value requirement, i.e. stress intensity level is more than regulation
Value, equipment is dangerous, then needs to optimize the structure size of component, then repeatedly step 1~step 8, until primary
Stress and primary plus secondary stress whole assessment of conformity.
The primary stress that adapter tube and casing connecting structure are calculated by taking Fig. 3 as an example, only illustrates to count for simple routing diameter ASN1
The process of calculation, is not evaluated by standard.Load is as shown in table 2 below, and sectional dimension calculated result is as shown in table 3, finite element mould
Molded dimension is as shown in table 4, and Pm Stress calculation is as shown in table 5, and Pm+Pb calculates as shown in table 6.
2 loadmeter of table
3 sectional dimension table of table
4 finite element model size table of table
| ASN | Node serial number | x | y | xm | ym | Path Y value |
| 1 | 3834 | 67.564 | 399.0848 | 75.85075 | 399.0848 | 399.085 |
| 3835 | 84.1375 | 399.0848 | ||||
| Coordinate Y value: | 399.0848 |
Table 5Pm Stress calculation table
In table, Sy, Sz, Sx and Syz are respectively to mark σ in M calculation formulaA、σH、σRAnd τHAIn concrete analysis model coordinate
Respective value in system, Sxy and Sxz are to be not required to calculate by two zero-valued entries in six stress in label M calculation formula.
Table 6Pm+Pb Stress calculation table
In table, Sy, Sz, Sx and Syz are respectively to mark σ in M calculation formulaA、σH、σRAnd τHAIn concrete analysis model coordinate
Respective value in system, Sxy and Sxz are to be not required to calculate by two zero-valued entries in six stress in label M calculation formula.
Pressure vessel carries out Stress Analysis Design by 9 above-mentioned steps, carries out evaluation satisfaction to the primary stress of extraction
When limit value requires, so that it may guarantee the equipment intensity for analyze design be it is qualified, it is primary add secondary stress assessment of conformity after, just
It ensure that the stability of equipment, i.e. new plastic deformation does not occur under the alternate load effect of limited times for equipment, thus into one
Step improves the security performance of equipment.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (8)
1. a kind of stress assessment method, which is characterized in that the stress assessment method is used to evaluate the adapter tube and pressure of pressure vessel
The stress of the join domain of the shell of force container, the stress assessment method include:
According to the mean radius of shell, shell opening diameter and adapter tube and shell between knuckle radius determine reinforcement for openings
Region；
Evaluation path is determined according to the envelope range of the dangerous working condition of pressure vessel；
The load composition for causing primary stress is determined according to the position in the reinforcement for openings region and the evaluation path；
According to the load composition, the characteristic parameter of the adapter tube and the corresponding position of each load contribution to the evaluation
The distance in path determines each components of stress for synthesizing the primary stress；
Three-dimensional principal stress is determined according to each components of stress；
The calculating stress intensity of the primary stress is determined according to the three-dimensional principal stress；
Primary stress is carried out according to the corresponding material allowable stress in position in the evaluation path and the calculating stress intensity to comment
It is fixed.
2. stress assessment method according to claim 1, which is characterized in that the position pair according to the evaluation path
The material allowable stress answered and the calculating stress intensity carry out after primary stress evaluation, further includes:
Establish the finite element model of pressure vessel；
The software stress of the finite element model is calculated using finite element analysis software；
Stress Linearization processing is carried out to the software stress on each evaluation path, obtains the adapter tube and the shell
Join domain bending stress；
It carries out once adding secondary stress according to the corresponding material allowable stress in position in the evaluation path and the bending stress
Evaluation.
3. stress assessment method according to claim 1, which is characterized in that the characteristic parameter of the adapter tube includes: adapter tube
In internal diameter, adapter tube outer diameter, adapter tube wall thickness, adapter tube area of section, adapter tube Torsion Section coefficient and adapter tube bending resistant section coefficient at least
One.
4. stress assessment method according to claim 1, which is characterized in that described to determine institute according to the three-dimensional principal stress
The calculating stress intensity for stating primary stress, specifically includes:
According to each three-dimensional principal stress, the stress intensity in each evaluation path is calculated using Mises yield criterion；
The calculating stress intensity that maximum stress intensity is denoted as the primary stress is filtered out from each stress intensity.
5. a kind of stress assessment system, which is characterized in that the stress assessment system is used to evaluate the adapter tube and pressure of pressure vessel
The stress of the join domain of the shell of force container, the stress assessment system include:
Reinforcement area determination module, for according between the mean radius of shell, the opening diameter of shell and adapter tube and shell
Knuckle radius determine reinforcement for openings region；
Path determination module is evaluated, the envelope range for the dangerous working condition according to pressure vessel determines evaluation path；
Load composition determining module causes once for being determined according to the position in the reinforcement for openings region and the evaluation path
The load composition of stress；
Components of stress determining module, for the characteristic parameter and each load contribution according to the load composition, the adapter tube
The distance in corresponding position to the evaluation path determines each components of stress for synthesizing the primary stress；
Three-dimensional principal stress determining module, for determining three-dimensional principal stress according to each components of stress；
Stress intensity determining module is calculated, for determining that the calculating stress of the primary stress is strong according to the three-dimensional principal stress
Degree；
Primary stress assessment module, for being answered according to the corresponding material allowable stress in position and the calculating in the evaluation path
Power intensity carries out primary stress evaluation.
6. stress assessment system according to claim 5, which is characterized in that the stress assessment system further include:
Finite element model establishes module, for establishing the finite element model of pressure vessel；
Software stress calculation module, for calculating the software stress of the finite element model using finite element analysis software；
Bending stress determining module, for carrying out Stress Linearization processing to the software stress on each evaluation path,
Obtain the bending stress of the adapter tube and the join domain of the shell；
Once plus secondary stress assessment module, for according to the evaluation corresponding material allowable stress in position in path and described
Bending stress carries out once plus secondary stress is evaluated.
7. stress assessment system according to claim 5, which is characterized in that the characteristic parameter of the adapter tube includes: adapter tube
In internal diameter, adapter tube outer diameter, adapter tube wall thickness, adapter tube area of section, adapter tube Torsion Section coefficient and adapter tube bending resistant section coefficient at least
One.
8. stress assessment system according to claim 5, which is characterized in that the calculating stress intensity determining module packet
It includes:
Stress intensity determination unit, for being calculated using Mises yield criterion each described according to each three-dimensional principal stress
Evaluate the stress intensity in path；
Screening unit, the calculating for being denoted as the primary stress for filtering out maximum stress intensity from each stress intensity
Stress intensity.
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