CN103853892A - Modeling and stress analysis method for silicon carbide coating layer of non-spherical fuel particles - Google Patents
Modeling and stress analysis method for silicon carbide coating layer of non-spherical fuel particles Download PDFInfo
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- CN103853892A CN103853892A CN201410108686.6A CN201410108686A CN103853892A CN 103853892 A CN103853892 A CN 103853892A CN 201410108686 A CN201410108686 A CN 201410108686A CN 103853892 A CN103853892 A CN 103853892A
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Abstract
The invention discloses a modeling and stress analysis method for a silicon carbide coating layer of non-spherical fuel particles. The modeling and stress analysis method comprises the following steps: dividing the non-spherical fuel particles into a ellipsoidal shape, a lug boss shape and combination of the ellipsoidal shape and the lug boss shape according to the shape characteristics; determining the variation range of parameters and determining parameter input by combining all the parameter variation intervals according to the physical parameters for producing practical fuel particles; analyzing the influences of a non-spherical geometrical factor and internal pressure on the stress size and distribution and establishing a stress distribution diagram according to the input parameters; judging the capability of the coating layer of the non-spherical fuel particles for bearing the internal pressure according to the stress distribution diagram. According to the modeling and stress analysis method for the silicon carbide coating layer of the non-spherical fuel particles provided by the invention, the data related to the breakage rate of the non-spherical fuel particles can be acquired, so that the quality of the fuel particles during a production process can be controlled and the in-pile running state of the fuel particles can be monitored.
Description
Technical field
The present invention is high temperature gas cooled reactor fuel element technical field, and particularly the model of non-ball fuel granulated carbon SiClx clad is set up and stress analysis method.
Background technology
The MHTR with inherent safety be considered to be hopeful most to meet the 4th generation one of the heap type that requires of Advanced Nuclear Energy Systems.The first of HTGR Nuclear Power Plant security ensures that the nuclear fuel using is exactly TRISO (multilayer isotropic) type coated particle, and it is by nuclear fuel UO
2pottery core core, loose pyrolytic carbon layer, interior fine and close pyrolytic carbon layer, silit (SiC) layer and outer fine and close pyrolytic carbon layer composition.The superpacket coating of coated fuel particle forms microspheroidal pressure vessel, and the radioactive product that constraint nuclear fission produces, is the main guarantee of high temperature gas cooled reactor safety.Most importantly SiC layer in four layers of clad structure, it is to bear in coated fuel particle, press and stop the key stratum that fission product discharges.
Fuel element is in operational process, along with the increase of burnup, gas fission product, the gathering of carbon monoxide and carbon dioxide and the solid-state fission gas of low volatilization point, all can cause the interior pressure of coated fuel particle to increase, in coated fuel particle clad, produce stress.Under the effect of heat and irradiation, the variation difference of individual material properties, also can produce stress at clad.In the time that these stress sums exceed the intensity of coated fuel particle clad, will there is the breakage of pressure shell-type in clad, loses the ability of constraint fission product, and the breakage of pressure shell-type is the coated topmost Breakage Mechanism of fuel particle.The model of build-up pressure shell-type breakage, is absolutely necessary interior stressed analysis of depressing to coated fuel particle.
Coated fuel particle is desirable or approaches very much desirable spheric grain under normal preparation condition, but due to foozle, having some aspheric coated fuel particles is compressed in fuel element, the stress distribution of these coated fuel particles and spherical coated fuel particle have very large difference, regional area exists very large stress and concentrates, therefore, their geometric configuratioies are set up correlation model and are carried out stress analysis extremely important.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: how to set up the model of non-ball fuel particle SiC clad and obtain coated fuel particle at the interior stressing conditions of depressing according to this model.
(2) technical scheme
In order to solve the problems of the technologies described above, the present invention proposes a kind of modeling method of non-ball fuel granulated carbon SiClx clad, comprise the following steps:
S1: according to features of shape, non-ball fuel particle is divided into the combination of elliposoidal, boss shape and these two kinds of shapes, for ellipsoidal particle, its model is ellipsoid shell, for boss shape particle, its model is made up of three parts, comprises two sections of spherical shells and one section of platform, smooth connection between three parts;
S2: according to the physical parameter of fuel particle in production reality, determine the variation range of input parameter in conjunction with the constant interval of each parameter;
S3: according to inputted parameter, analyze the geometrical factor of non-ball fuel particle and the impact of interior pressure counter stress size and distribution, set up stress envelope;
S4: the ability of passing judgment on non-ball fuel granulated carbon SiClx clad and bear interior pressure according to stress envelope.
Wherein, the step of setting up ellipsoidal particle model comprises: setting up major axis is that 2a, minor axis are the elliptical ring that 2b, thickness are d, and this figure is rotated a circle and obtains three-dimensional ellipsoid shell around axis of symmetry.
Wherein, the step of setting up boss shape granular model comprises:
S11: set up radius R
1, rescinded angle ψ
1, rotate pi/2+ψ around initial point
1covering of the fan;
S12: set up radius R
2, rescinded angle ψ
2, initial point horizontal ordinate-(R
1-R
2) * sin (ψ
2), ordinate (R
1-R
2) * cos (ψ
2) covering of the fan;
S13: set up a quadrilateral, the coordinate of four end points respectively: (0,0), (0, R
2+ (R
1-R
2) * cos (ψ
1)), ((R
1-R
2) * sin (ψ
1), R
2+ (R
1-R
2) * cos (ψ
1)), ((R
1-R
2) * sin (ψ
1), (R
1-R
2) * cos (ψ
1));
S14: set up union, three figures that do in S11, S12, S13 are combined into the first figure A;
S15: by R
1and R
2length increase respectively d, repeating step S11, S12, S13, S14, form the second graph B of a merging;
S16: second graph B deducts the first figure A and obtain the figure of the coated fuel particle of boss shape, and this figure is rotated a circle and obtains three-dimensional boss shape around axis of symmetry.
The parameter of wherein, producing described fuel particle comprises the length-diameter ratio of interior pressure, silicon carbide layer thickness, silicon carbide layer internal diameter, elliposoidal and the boss shape of aspherical particle.
Wherein, the parameter variation range of inputting is: in fuel particle, pressing is 10～25MPa, and silicon carbide layer thickness is 25～45 μ m, and silicon carbide layer internal diameter is 355～415 μ m, and length-diameter ratio is 1.0～1.2.
The invention allows for a kind of stress analysis method of non-ball fuel granulated carbon SiClx clad, wherein utilize above-mentioned any one modeling method to set up model, it is characterized in that, comprising:
Change the variation of the geometric parameters analysis stress state of elliposoidal and boss shape particle;
The interior pressure that changes coated fuel particle is analyzed the variation of stress state;
Pass judgment on the impact of stress state on the breakage of silicon carbide layer pressure shell-type according to the strength theory in mechanics of materials field.
Wherein, described geometric parameter comprises radius, thickness and length-diameter ratio.
Wherein, described stress state comprises stress intensity, stress direction, two-dimensional stress distribution plan, three-dimensional Stress Distribution figure and stress concentration degree.
(3) beneficial effect
According to modeling and the analytical approach of non-ball fuel particle SiC clad of the present invention, can obtain non-ball fuel rock frame stress state and then obtain the related data of breakage rate, to control fuel particle quality in process of production, the running status of monitoring fuel particle in heap, thereby the safety guarantee of raising HTGR Nuclear Power Plant.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only examples more of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that geometric model and the grid of elliposoidal coated particle divided.
Fig. 2 is the geometric model of boss shape coated particle.
Fig. 3 is that process of establishing and the grid of boss shape silicon carbide layer geometric model divided.
Fig. 4 is stress distribution in two-dimentional elliposoidal silicon carbide layer.
Fig. 5 is stress distribution in triaxial ellipsoid shape silicon carbide layer.
Fig. 6 is that the stress concentration degree of elliposoidal silicon carbide layer is with the variation of length-diameter ratio.
Fig. 7 is that boss shape silicon carbide layer stress is with R
2variation.
Fig. 8 is the variation of boss shape silicon carbide layer stress with length-diameter ratio.
Fig. 9 is the stress concentration degree of boss shape silicon carbide layer and the relation of length-diameter ratio.
Figure 10 is two-dimentional boss shape silicon carbide layer stress envelope.
Figure 11 is three-dimensional boss shape silicon carbide layer stress envelope.
Figure 12 is boss shape silicon carbide layer principal stress plane schematic diagram (length-diameter ratio=1.04).
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, ordinary skill people, not making the every other embodiment obtaining under creative work prerequisite, belongs to the scope of protection of the invention.
The object of the invention is to set up and analytical calculation simulation non-ball fuel particle SiC clad stress distribution situation and STRESS VARIATION feature under the effect of interior pressure in actual manufacture process by model.
1. non-spherical coated fuel particle computational geometry model and grid are divided
In the coated fuel particle of reality, aspheric geometric configuration has diversity, but sum up, there are two kinds of geometries very representative, respectively the coated fuel particle of elliposoidal and the coated fuel particle of boss shape, the shape of other coated fuel particle, can comprehensively be formed by these two kinds of particle shapes.In Geometric Modeling, adopt this parameter of length-diameter ratio (ε) to be described aspheric degree.
The geometric model of ellipsoidal particle and grid are divided as shown in Figure 1, and the major axis of oval internal diameter is 2a, and minor axis is 2b, and thickness is d.This figure is rotated a circle and can obtain three-dimensional ellipsoid shell around axis of symmetry.In this model, length-diameter ratio is major axis and the ratio of minor axis, that is:
The geometric model of another non-spherical coated fuel particle is boss shape.This geometric model is made up of three parts, comprises two sections of spherical shells and a platform, smooth connection between three parts.The internal diameter of the spherical shell that as shown in Figure 2, Part I is larger is R
1, its central angle is ψ
1; The internal diameter of the spherical shell of Part II transition is R
2, corresponding central angle is ψ
2; The radius of platform is R
3; Thickness is d.This figure is rotated a circle and can obtain the coated fuel particle model of three-dimensional boss shape around axis of symmetry.In this model, exist some potential geometric relationships as follows:
ψ
1+ψ
2＝180° (2)
R
3＝sinψ
2(R
1-R
2) (3)
In addition, for the non-spherical factor of the coated fuel particle of boss shape is described, also need to introduce this parameter of length-diameter ratio.In the coated fuel particle of boss shape, defining length-diameter ratio is:
The process of manufacturing according to the design standards of coated fuel particle and actual production, R herein
1representing the radius of silicon carbide layer, is a fixed value.Total R in above-mentioned three relational expressions
2, R
3, ψ
1, ψ
2, five variablees of ε, therefore, as long as determine that two variablees can determine that a boss shape is coated the geometric configuration of fuel particle completely.
The coated fuel particle geometric model of boss shape and grid are divided as shown in Figure 3, and concrete step is as follows:
(a) set up radius R
1, rescinded angle ψ
1, rotate pi/2+ψ around initial point
1covering of the fan;
(b) set up radius R
2, rescinded angle ψ
2, initial point horizontal ordinate-(R
1-R
2) * sin (ψ
2), ordinate (R
1-R
2) * cos (ψ
2) covering of the fan;
(c) set up a quadrilateral, the coordinate of four end points respectively: (0,0), (0, R
2+ (R
1-R
2) * cos (ψ
1)), ((R
1-R
2) * sin (ψ
1), R
2+ (R
1-R
2) * cos (ψ
1)), ((R
1-R
2) * sin (ψ
1), (R
1-R
2) * cos (ψ
1));
(d) set up union, three figures that do in (a), (b), (c) are combined into the first figure A;
(e) by R
1and R
2length increase respectively d, repeating step (a), (b), (c), (d), form the second graph B of a merging;
(f) second graph B deducts the first figure A and obtains the figure of the coated fuel particle of boss shape.
After having set up geometric model, corresponding boundary condition, grid division are set, solve and just can obtain the stress distribution in boss shape silicon carbide layer.Because the stress ratio at transition spherical shell place and platform place is more concentrated, so the mesh-density at this two place is larger.
2. the parameter of model input
2.1SiC material properties
The coated fuel particle clad silit of high temperature gas cooled reactor is a kind of viscoelastic material, but its character and linear elastic materials are very approaching, in calculating, silit are set as to linear elastic materials.The Main Mechanical parameter of SiC is in table 1:
Table 1SiC Main Mechanical parameter
The interior pressure of 2.2 coated fuel particles
In coated fuel particle, the suffered interior pressure of SiC layer is mainly derived from CO, CO
2and fission gas, a series of heap work relating to parameters such as its size and core core size, heavy metal burnup.In coated fuel particle, internal gas pressure can be tried to achieve from equation for ideal gases:
Wherein, F
d---the relative share that gas fission product discharges;
OPF---the free oxygen quantity that each fission produces;
V
m---the molar volume of core core, the m3/mol of unit;
F
f---the yield of stable state gas fission product;
F
b---heavy metal burnup, the FIMA of unit;
V
k---core core volume, the m3 of unit;
V
f---loose pyrolytic carbon layer voidage, the m3 of unit, accounts for 50% of weaker zone volume;
R---gas law constant.2.3 model calculating parameter variation ranges
The actual conditions of manufacturing according to coated fuel particle, a lot of parameters all can have a small variation round reference value, and the variation meeting of these parameters exerts an influence to the stress distribution of coated fuel particle.When concrete calculating, mainly consider the variation of following parameter: interior pressure, silicon carbide layer thickness, silicon carbide layer radius, length-diameter ratio, design parameter is as table 2.
Table 2 aspherical particle SiC layer calculating parameter change list
Below specifically introducing elliposoidal SiC ply stress analyzes and the analysis of boss shape SiC ply stress.
(1) elliposoidal SiC ply stress is analyzed
Elliposoidal fuel particle clad has been considered to the impact of length-diameter ratio, calculated and find, in ellipsoidal particle, the meridian stress at axis of symmetry end points place is identical with parallel stress value, and this meets mechanical analysis and the derivation of analytic solution.
Fig. 4 is that interior pressure 17 MPas, length-diameter ratio are respectively 1.01,1.05,1.10,1.14,1.20, the two-dimentional first principal stress distribution plan obtaining when silicon carbide layer thickness 35 μ m.Fig. 5 is the length-diameter ratio three-dimensional first principal stress distribution plan of 1.01,1.2 o'clock.For ellipsoidal particle, major principal stress appears at minor axis place.Due to the change of length-diameter ratio, the shell stress being caused by interior pressure has had larger variation, has produced the stress higher than the spherical coated fuel particle of ideal in the part of housing, and along with the increase of length-diameter ratio, the value of maximum stress also increases thereupon.At thickness direction, stress radially reduces from inside to outside gradually.Major principal stress appears at the inner radius summit of ellipsoid minor axis, is 112MPa when length-diameter ratio 1.2, and least principal stress appears at the outer radius summit of ellipsoid major axis, when length-diameter ratio 1.2, is 57MPa, and the two differs 55MPa.In spherical silicon carbide layer in equal under pressure effect, major principal stress is 94MPa, and the major principal stress in the elliposoidal silicon carbide layer that length-diameter ratio is 1.2 is than its large 18MPa.
Calculate the concentrated degree of expression stress that maximum first principal stress and the ratio of average first principal stress can be quantitative, wherein, by each point first principal stress, the integration to volume (∫ σ dv) obtains than upper cumulative volume (v) mean stress.As seen from Figure 6, it is not that clearly stress distribution is more even that the stress of the coated fuel particle of elliposoidal is concentrated feature, and maximum stress is about 1.1～1.2 times of mean stress.Along with the increase of length-diameter ratio, stress concentration degree is also larger, and the stress concentration degree at minor axis place is apparently higher than the stress concentration degree at major axis place.
(2) boss shape SiC ply stress is analyzed
The shape of the coated fuel particle of boss shape is more complicated compared to the shape of the coated fuel particle of elliposoidal, and stress distribution is also more complicated, and maximum first principal stress is also larger.Find out R from the process of Geometric Modeling
2after determining with length-diameter ratio, the shape of particle is just completely definite.In the time that interior pressure is 10MPa, the maximum stress of the coated fuel particle of boss shape with the Changing Pattern of length-diameter ratio and transition spherical shell radius as shown in Figure 7.
Length-diameter ratio one timing, along with R
2increase, the maximum stress in the coated fuel particle of boss shape reduces gradually, length-diameter ratio is larger, the trend that maximum stress reduces is more obvious.Hour, it is less that boss shape particle departs from spherical degree to length-diameter ratio, R
2the impact of counter stress is little; When length-diameter ratio is larger, it is larger that boss shape particle departs from spherical degree, R
2hour, especially with R
1have a long way to go time, the stress at the platform place that edge load causes will be larger.As can be seen from the figure, R
2from 40 μ m to 80 μ m, stress value amplitude of variation is very large, if R
2value continues to reduce, and the stress in boss shape particle is by the rising occurring sharply, and this is because R
2very little geometric model platform place is very long, and the stress value at platform center increases more.R
2while being greater than 80 μ m, along with R
2increase, it is milder that maximum stress reduces, until R
2till maximum.According to geometric model, R
2while increasing to a certain degree, there is not corresponding mock-up.
Fig. 8 be interior pressure while being 10MPa in the coated fuel particle of boss shape maximum stress with the variation of length-diameter ratio.Consistent with the coated fuel particle of elliposoidal, along with the increase of length-diameter ratio, the major principal stress in boss shape particle also increases thereupon.The STRESS VARIATION that the STRESS VARIATION that but in boss shape particle, length-diameter ratio is brought is come much larger than pressure zone in ellipsoidal particle.The maximum stress that in boss particle, length-diameter ratio is brought changes the variation that can reach hundreds of MPa and can only bring tens MPas in ellipsoidal particle.R
2less, the gradient that maximum stress changes with length-diameter ratio is with regard to greatly, at R
2more approach the radius R of megalosphere
1time, variable gradient is just less.In the manufacturing of coated fuel particle, R
2less, the particle that length-diameter ratio is larger all can be sized away.
Consider the stress concentration degree of the coated fuel particle of boss shape.As Fig. 9, choose interior pressure 17MPa, R
2the situation that is 40 μ m is analyzed, and along with the increase of length-diameter ratio, the ratio increase of maximum stress and mean stress is comparatively obvious, and in the time that length-diameter ratio is greater than 1.1, maximum stress is all at the more than 5 times of mean stress.The stress that the coated fuel particle of boss shape is described is concentrated feature clearly, therefore, in actual production process, should strictly control the appearance of the coated fuel particle of boss shape that length-diameter ratio is larger.
It is complicated a lot of that the distribution of stress in the coated fuel particle of boss shape is coated fuel particle compared to spherical and elliposoidal.Spheric grain stress distribution is very even, and principal direction of stress is tangential stress.The stress of ellipsoidal particle is concentrated at minor axis place, and the direction of principle stress is also tangential direction (vertical with every bit inscribed circle radius direction).Boss shape particle is geometrically being made up of three parts, the every part separately stress distribution under the effect of interior pressure is all fairly simple, when but three parts are combined, the strain and displacement difference that every part produces under interior pressure effect, the distortion of three parts mutually restricts and can produce an edge loading in every part.Be subject to the impact of this edge loading, it is very complicated that the stress distribution of boss shape particle just becomes.For megalosphere, be subject to the impact of edge loading less away from other two-part places, its stress distribution and stress intensity are identical with stress distribution and the stress intensity of spherical coated fuel particle under interior pressure effect, and the direction of principle stress is also in close proximity to radial direction.
Interior pressure 17MPa as shown in figure 10, length-diameter ratio is respectively 1.02,1.04,1.06,1.08,1.1, R
2it is the two-dimentional boss shape silicon carbide layer stress envelope of 280 microns.Three-dimensional boss shape silicon carbide layer stress envelope when Figure 11 is length-diameter ratio 1.04.In these five distribution plans, the stress of megalosphere part is 94MPa left and right, basically identical with spheric grain stress under pressure effect in 17MPa.Transition spherical shell and terrace part geometric volume with respect to megalosphere is little, is subject to the impact of edge loading also larger, and stress occurs concentrating in the outside at excessive spherical shell inner side and platform center, and maximum first principal stress appears at platform center.The stress at platform place is by being reduced to gradually negative value in outer radial, STRESS VARIATION gradient is very large, and the stress at transition spherical shell place is outwards reduced to negative value gradually by internal diameter, and place is contrary with platform, but its gradient is less than the STRESS VARIATION gradient at platform place.If there is no the effect of edge loading, the principal direction of stress at platform place should be tangential direction, under the effect of edge loading, the direction of platform place principle stress is offset to transition spherical shell place, degree from the large local principal direction of stress Off-Radial of transition spherical shell distance is less, in platform center, principal direction of stress is radial direction substantially, as shown in figure 12.
Above embodiment is only for the present invention is described, but not limitation of the present invention.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out to various combinations, revises or is equal to replacement, the spirit and scope that do not depart from technical solution of the present invention, it all should be encompassed in the middle of claim of the present invention and scope.
Claims (8)
1. a modeling method for non-ball fuel granulated carbon SiClx clad, comprises the following steps:
S1: according to features of shape, non-ball fuel particle is divided into the combination of elliposoidal, boss shape and these two kinds of shapes, for ellipsoidal particle, its model is ellipsoid shell, for boss shape particle, its model is made up of three parts, comprises two sections of spherical shells and one section of platform, smooth connection between three parts;
S2: according to the physical parameter of fuel particle in production reality, determine the variation range of input parameter in conjunction with the constant interval of each parameter;
S3: according to inputted parameter, analyze the geometrical factor of non-ball fuel particle and the impact of interior pressure counter stress size and distribution, set up stress envelope;
S4: the ability of passing judgment on non-ball fuel granulated carbon SiClx clad and bear interior pressure according to stress envelope.
2. method according to claim 1, the step of wherein setting up ellipsoidal particle model comprises: setting up major axis is that 2a, minor axis are the elliptical ring that 2b, thickness are d, and this figure is rotated a circle and obtains three-dimensional ellipsoid shell around axis of symmetry.
3. method according to claim 1, the step of wherein setting up boss shape granular model comprises:
S11: set up radius R
1, rescinded angle ψ
1, rotate pi/2+ψ around initial point
1covering of the fan;
S12: set up radius R
2, rescinded angle ψ
2, initial point horizontal ordinate-(R
1-R
2) * sin (ψ
2), ordinate (R
1-R
2) * cos (ψ
2) covering of the fan;
S13: set up a quadrilateral, the coordinate of four end points respectively: (0,0), (0, R
2+ (R
1-R
2) * cos (ψ
1)), ((R
1-R
2) * sin (ψ
1), R
2+ (R
1-R
2) * cos (ψ
1)), ((R
1-R
2) * sin (ψ
1), (R
1-R
2) * cos (ψ
1));
S14: set up union, three figures that do in S11, S12, S13 are combined into the first figure A;
S15: by R
1and R
2length increase respectively d, repeating step S11, S12, S13, S14, form the second graph B of a merging;
S16: second graph B deducts the first figure A and obtain the figure of the coated fuel particle of boss shape, and this figure is rotated a circle and obtains three-dimensional boss shape around axis of symmetry.
4. method according to claim 1, the parameter of wherein producing described fuel particle comprises the length-diameter ratio of the interior pressure of aspherical particle, silicon carbide layer thickness, silicon carbide layer internal diameter, elliposoidal and boss shape.
5. method according to claim 4, the parameter variation range wherein inputted is: in fuel particle, pressing is 10～25MPa, and silicon carbide layer thickness is 25～45 μ m, and silicon carbide layer internal diameter is 355～415 μ m, and length-diameter ratio is 1.0～1.2.
6. a stress analysis method for non-ball fuel granulated carbon SiClx clad, wherein utilizes any one modeling method in claim 1-5 to set up model, it is characterized in that, comprising:
Change the variation of the geometric parameters analysis stress state of elliposoidal and boss shape particle;
The interior pressure that changes coated fuel particle is analyzed the variation of stress state;
Pass judgment on the impact of stress state on the breakage of silicon carbide layer pressure shell-type according to strength theory.
7. method according to claim 6, is characterized in that, wherein said geometric parameter comprises radius, thickness and length-diameter ratio.
8. method according to claim 6, is characterized in that, wherein said stress state comprises stress intensity, stress direction, two-dimensional stress distribution plan, three-dimensional Stress Distribution figure and stress concentration degree.
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| CN107944138A (en) * | 2017-11-23 | 2018-04-20 | 福州大学 | Steel Tube Joint factor of stress concentration computational methods based on connection stiffness |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104575626A (en) * | 2014-12-19 | 2015-04-29 | 清华大学 | Tracing microsphere for pebble bed high-temperature gas-cooled reactor |
| CN107944138A (en) * | 2017-11-23 | 2018-04-20 | 福州大学 | Steel Tube Joint factor of stress concentration computational methods based on connection stiffness |
| CN107944138B (en) * | 2017-11-23 | 2021-03-30 | 福州大学 | Steel pipe node stress concentration coefficient calculation method based on node rigidity |
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