CN115062522A - Strength determination method based on fabricated structure, electronic device and storage medium - Google Patents
Strength determination method based on fabricated structure, electronic device and storage medium Download PDFInfo
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Abstract
The invention provides a strength determination method based on an assembled structure, electronic equipment and a storage medium, and relates to the technical field of deformation resistance strength analysis of the assembled structure. The method comprises the following steps: acquiring a finite element model to be processed; dividing a contact surface of each reinforcing plate shell unit in the finite element model to be processed to obtain a first contact surface, a second contact surface and a third contact surface which are sequentially arranged along the transverse direction and correspond to each reinforcing plate shell unit; and applying pressure load on the inner surfaces of all the main plate shell units and the reinforcing plate shell units to obtain the deformation resistance. The invention converts the entity unit into the shell unit, improves the calculation efficiency of the finite element model to be processed, and divides the reinforcing plate shell unit into a first contact surface, a second contact surface and a third contact surface according to the contact relation between the reinforcing plate shell unit and the corresponding main plate, so that one contact surface of the reinforcing plate shell unit only serves as one auxiliary surface, and the problem that the finite element model analysis and calculation can not be converged is solved.
Description
Technical Field
The invention relates to the technical field of deformation-resistant strength analysis of an assembled structure, in particular to a strength determination method based on the assembled structure, electronic equipment and a storage medium.
Background
The assembled structure refers to a structure which can be assembled into a whole device through components, such as an assembled tank structure, wherein the assembled tank structure is formed by assembling a plurality of main boards and reinforcing boards through bolts. In establishing a surface-to-surface connection relationship for a fabricated structure for finite element analysis, it is desirable to avoid as many times as possible a surface being used as a sub-surface. Otherwise, when one surface is used as a secondary surface for multiple times, a situation that one node (secondary surface) belongs to multiple nodes (primary surfaces) at the same time occurs, so that finite element model analysis and calculation cannot be converged, and simulation cannot be performed.
Disclosure of Invention
Aiming at the technical problems, the technical scheme adopted by the invention is as follows:
the strength determination method based on the fabricated structure comprises the following steps:
s100, acquiring a finite element model to be processed corresponding to the assembly type structure; the assembly type structure comprises a main board and a reinforcing board; the main boards are connected with each other, and each reinforcing board is positioned at the longitudinal connecting position of two corresponding adjacent main boards; in the finite element model to be processed, the attribute of a main board shell unit corresponding to a main board is a shell unit, the attribute of a reinforcing board shell unit corresponding to a reinforcing board is a shell unit, and the main board shell unit and the reinforcing board shell unit are both of two-dimensional plane structures;
s200, respectively endowing the main board shell unit and the reinforcing board shell unit with material characteristics and section properties; the material characteristics comprise density, elastic model, Poisson's ratio and yield strength; the cross-sectional attributes include thickness cross-sections of the main board shell unit and the stiffener shell unit;
s300, applying displacement constraint to the bottom end of the main board shell unit at the lowest layer of the finite element model to be processed; the freedom degrees of displacement constraint are all 0, namely the three displacement freedom degrees of xyz and the three rotational freedom degrees of x axis, y axis and z axis of the finite element model to be processed are all 0; the displacement constraint is used for limiting the finite element model to be processed not to generate displacement, and in the simulation of the real working condition, the assembly type structure corresponding to the finite element model to be processed is fixed on the ground;
s400, dividing contact surfaces of each reinforcing plate shell unit to obtain a first contact surface, a second contact surface and a third contact surface which are sequentially arranged along the transverse direction and correspond to each reinforcing plate shell unit; the width of the first contact surface is equal to that of the third contact surface and is greater than that of the second contact surface;
the contact surface division comprises the following steps:
s410, determining a contact line of a gap between the reinforcing plate shell unit and the two corresponding main plate shell units;
s420, determining a second contact surface on the reinforcing plate shell unit according to the target width W and the contact line, wherein the center line of the second contact surface is overlapped with the contact line; wherein the target width W is the width of the second contact surface, W = α × H; alpha is a preset coefficient, and H is the width of the reinforcing plate shell unit;
s430, setting a part, located on the first side of the second contact surface, of the reinforcing plate shell unit as a first contact surface;
s440, setting a part, located on the second side of the second contact surface, of the reinforcing plate shell unit as a third contact surface; the second side of the second contact surface is the opposite side of the first side of the second contact surface;
s500, establishing a contact relation between the first contact surface and the main board shell unit positioned on the first side of the reinforcing board shell unit; the first side of the reinforcing plate shell unit corresponds to the first side of the second contact surface; the contact relation between the first contact surface and the corresponding main board shell unit is surface-surface contact, and binding conditions are set for the surface-surface contact;
s600, establishing a contact relation between the second contact surface and the two main board shell units corresponding to the reinforcing board shell unit where the second contact surface is located; the contact relation between the second contact surface and the two corresponding main board shell units is universal contact;
s700, establishing a contact relation between the third contact surface and the main board shell unit positioned on the second side of the reinforcing board shell unit; the second side of the reinforcing plate shell unit is the opposite side of the first side of the reinforcing plate shell unit; the second side of the reinforcing plate shell unit corresponds to the second side of the second contact surface, the contact relation between the third contact surface and the corresponding main plate shell unit is surface-surface contact, and binding conditions are set for the surface-surface contact;
s800, applying pressure load on the inner surfaces of all the main board shell units and the reinforcing board shell units to obtain the deformation resistance strength of the main board shell units and the reinforcing board shell units of the finite element model to be processed; the pressure direction of the pressure load points to the outer side of the finite element model to be processed from the central axis of the longitudinal direction of the finite element model to be processed.
The pressure intensity P of the pressure load received at the nth point on the finite element model to be processed n =ρgh n (ii) a Wherein rho is the liquid density of the liquid corresponding to the pressure load, g is the gravity acceleration, h n The vertical distance from the nth point to the highest point of the pressure load.
The invention has at least the following beneficial effects:
the main board solid unit and the reinforcing board solid unit of the assembly structure are converted into the corresponding main board shell unit and the corresponding reinforcing board shell unit, the finite element model to be processed is established, the solid units are converted into the shell units, and the calculation efficiency of the finite element model to be processed is improved. The method comprises the steps of applying displacement constraint to the bottom end of the lowest main board shell unit to simulate a scene with a fixed assembly type structure, dividing each reinforcing board shell unit in a finite element model to be processed into a first contact surface, a second contact surface and a third contact surface, enabling each reinforcing board to be simultaneously assembled with two main boards, establishing a contact relation between the first contact surface of each reinforcing board shell unit and the main board shell unit on the first side of the reinforcing board shell unit, establishing a contact relation between the second contact surface and the two main board shell units corresponding to the second contact surface, and establishing a contact relation between the third contact surface and the main board shell unit on the second side of the reinforcing board shell unit, enabling one contact surface of each reinforcing board shell unit to be prevented from being used as an auxiliary surface for many times as possible, and solving the problem that finite element model analysis and calculation cannot be converged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a finite element model to be processed in a strength determination method based on an assembly structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a fabricated structure in a strength determination method based on a fabricated structure according to an embodiment of the present invention, where the fabricated structure is a cylinder structure;
fig. 3 is a schematic view of a pressure load in a strength determination method based on an assembled structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a general contact configuration in a method for determining strength based on a fabricated structure according to an embodiment of the present invention;
FIG. 5 is a schematic top cross-sectional view of a junction between a main panel and a stiffener panel of a prior art fabricated structure;
fig. 6 is a schematic top cross-sectional view of a joint between a main board and a reinforcing board of a finite element model to be processed in a strength determination method based on a fabricated structure according to an embodiment of the present invention.
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.
A strength determination method based on an assembly structure is used for analyzing the deformation resistance of the assembly structure under pressure load.
A strength determination method based on an assembled structure comprises the following steps:
s100, acquiring a finite element model to be processed corresponding to the assembly type structure; the assembly type structure comprises a main board and a reinforcing board; the main boards are connected with each other, and each reinforcing board is positioned at the longitudinal connection position of two corresponding adjacent main boards; in the finite element model to be processed, the attribute of the main board shell unit corresponding to the main board is a shell unit, the attribute of the reinforcing board shell unit corresponding to the reinforcing board is a shell unit, and the main board shell unit and the reinforcing board shell unit are both of two-dimensional plane structures;
as shown in fig. 2, if the fabricated structure is a cylindrical structure, the main plate housing unit and the reinforcing plate housing unit may have a two-dimensional plane structure with a radian, when the fabricated structure is a cylindrical structure, such as a sewage tank, when the finite element model to be processed is established, beam element attributes of the hoop are required to be established besides the reinforcing plate and the main plate, the hoop is a fixed structure at the periphery of the cylinder structure and can be reinforced angle steel, used for increasing the structural rigidity and the strength of the assembly type structure and improving the anti-deformation capability of the assembly type structure, the hoop is positioned at the outer side of a cylinder body enclosed by a plurality of main boards, the device is used for simulating the real structure of the cylinder body, the property of a hoop beam unit corresponding to a hoop is a beam unit, the hoop beam unit is a one-dimensional structure with radian, and establishing a beam-shell unit finite element model according to the main board shell unit, the reinforcing board shell unit and the hoop beam unit. The solid units of the main board, the reinforcing plate and the hoop of the fabricated structure are replaced by the shell unit and the beam unit, the solid units are real constituent units of the fabricated structure and are three-dimensional units, more unit nodes are required to be used by the three-dimensional units during finite element analysis, the shell units are two-dimensional units and can be regarded as one surface, and the used nodes are fewer than the three-dimensional units during finite element analysis, so that the number of grids can be reduced, and therefore, the calculation efficiency of a to-be-processed model can be improved by replacing the solid units by the finite element shell units.
The method for determining the main board shell unit and the reinforced board shell unit of the finite element model to be processed comprises the following steps: the middle surface of the main board and the reinforcing board is extracted from the corresponding main board and the reinforcing board, and the main board solid unit and the reinforcing board solid unit of the three-dimensional structure are replaced by the main board shell unit and the reinforcing board shell unit of the two-dimensional structure. During specific implementation, the front and the back of the entity unit are specified in preset engineering structure simulation software (which can be CAD modeling software such as Solidworks or UG), the engineering structure simulation software can automatically extract a middle surface, namely the middle surface of the geometric body of the entity unit, the purpose of extracting the middle surface is to convert a three-dimensional structure into a two-dimensional structure, and then a section (which can be a section with the thickness of a plate) is given on the two-dimensional structure, so that equivalent substitution of the two-dimensional structure and the three-dimensional structure can be realized.
The sizes of the main plate shell unit, the reinforcing plate shell unit and the hoop beam unit of the finite element model to be processed are the same as those of the solid units of the main plate, the reinforcing plate and the hoop of the assembly structure. In an actual scene, the main boards are assembled and connected through the bolts, but the connection area of the bolts is a non-attention area of the invention, namely, the technical problem of the invention is not influenced, and the influence of the bolts on the whole deformation of the finite element model to be processed is small, so that the bolts are not established in the finite element model to be processed, bolt holes in the main boards and the reinforcing plates are removed, and only the main board shell units, the reinforcing plate shell units, the hoop beam units and other characteristics corresponding to the main boards, the reinforcing plates and the hoops are reserved on the finite element model to be processed.
The method for establishing the finite element model to be processed according to the assembled structure comprises the following steps:
outputting the finite element model to be processed into a first target file which can be identified by preset engineering structure simulation software, importing the first target file into the engineering structure simulation software, and establishing the finite element model to be processed; if the finite element model to be processed is established by using CAD software, the first target file can be an x _ t file.
S200, respectively endowing the main board shell unit, the reinforcing board shell unit and the hoop beam unit with material characteristics and section properties; the material characteristics comprise density, elastic model, Poisson's ratio and yield strength; the section attributes comprise thickness sections of the main board shell unit and the reinforcing board shell unit and cross sections of the hoop beam unit;
s300, applying displacement constraint to the bottom end of the main board shell unit at the lowest layer of the finite element model to be processed; the freedom degrees of displacement constraint are all 0, namely the three displacement freedom degrees of xyz and the three rotational freedom degrees of x axis, y axis and z axis of the finite element model to be processed are all 0; the displacement constraint is used for limiting the finite element model to be processed not to generate displacement, and in the simulation of the real working condition, the assembly type structure corresponding to the finite element model to be processed is fixed on the ground;
in order to make each node in the finite element model to be processed only belong to another node, each reinforcing plate needs to be processed, the node is a surface in the finite element model to be processed and can be a main plate shell unit or a reinforcing plate shell unit, because a reinforcing plate of an assembly structure is simultaneously connected with two main plates, and the main plates belong to a single connection relation, therefore, only division processing needs to be carried out on each reinforcing plate, so that the node on the reinforcing plate only singly forms a subordinate relation with the node on the main plate, and the division processing method of the reinforcing plate comprises the following steps:
s400, dividing a contact surface of each stiffener shell unit to obtain a first contact surface, a second contact surface, and a third contact surface, which are sequentially arranged along a transverse direction, corresponding to each stiffener shell unit, as shown in fig. 1 and 6, and fig. 5 is a schematic top-view cross-sectional view of a junction between a main board and a stiffener plate of an existing assembly structure; the reinforcing plate shell unit is of a two-dimensional structure, so that the reinforcing plate shell unit is divided into three contact surfaces from left to right, namely a first contact surface, a second contact surface and a third contact surface; the width of the first contact surface is equal to that of the third contact surface and is greater than that of the second contact surface;
the contact surface division comprises the following steps:
s410, determining a contact line of a gap between the reinforcing plate shell unit and the two corresponding main plate shell units; because the reinforcing plate shell unit is positioned at the longitudinal connecting position of the two main plate shell units, the contact line is the contact line of the gap of the longitudinal connection of the two main plate shell units;
s420, determining a second contact surface on the reinforcing plate shell unit according to the target width W and the contact line, wherein the center line of the second contact surface is overlapped with the contact line; wherein the target width W is the width of the second contact surface, W = α × H; alpha is a preset coefficient, H is the width of the reinforcing plate shell unit, and the second contact surface is positioned on a contact line of the two main plate shell units;
s430, setting a part, located on the first side of the second contact surface, of the reinforcing plate shell unit as a first contact surface; the second contact surface first side may be a left side of the second contact surface;
s440, setting a part, located on the second side of the second contact surface, of the reinforcing plate shell unit as a third contact surface; the second side of the second contact surface is the opposite side of the first side of the second contact surface;
s500, establishing a contact relation between the first contact surface and the main board shell unit positioned on the first side of the reinforcing board shell unit; the first side of the gusset shell unit corresponds to the first side of the second contact surface, and the first side of the gusset shell unit may be the left side of the gusset shell unit; the contact relation between the first contact surface and the corresponding main board shell unit is surface-surface contact, and binding conditions are set for the surface-surface contact;
s600, establishing a contact relation between the second contact surface and two main plate shell units corresponding to the reinforcing plate shell unit where the second contact surface is located; the contact relationship between the second contact surface and the two corresponding main board shell units is a universal contact, and the schematic diagram of the arrangement of the universal contact is shown in fig. 4;
s700, establishing a contact relation between the third contact surface and the main board shell unit positioned on the second side of the reinforcing board shell unit; the second side of the reinforcing plate shell unit is the opposite side of the first side of the reinforcing plate shell unit; the second side of the gusset shell unit corresponds to the second side of the second contact surface, and the second side of the gusset shell unit can be the right side of the gusset shell unit; the contact relation between the third contact surface and the corresponding main board shell unit is surface-surface contact, and binding conditions are set for the surface-surface contact;
if the assembled structure is a cylinder structure, the hoop beam unit is of a one-dimensional line structure, and the main board shell unit is of a two-dimensional surface structure, so that line-surface contact is formed between the hoop beam unit and the main board shell unit.
When the surface of one entity penetrates the surface of the other entity, surface-surface contact is used, which is completely symmetrical, for which the contact surface and the target surface need to be defined by the node components and PART numbers, and is generally used for processing scenes with a large amount of relative sliding between the entities and allowing the binding condition to be set for the surface-surface contact, in this embodiment, the contact surfaces are a first contact surface and a third contact surface, and the target surface is a mainboard shell unit.
The universal contact does not consider the thickness of the shell when calculating the contact force, and provides a more elastic method for increasing the details of the contact in a finite element model. The contact area and the like are simpler and more convenient, so that the second contact surface and the two main board shell units are in universal contact.
Dividing the reinforcing plate shell unit into a first contact surface, a second contact surface and a third contact surface from left to right, when the first side of the second contact surface and the first side of the reinforcing plate shell unit are both the left side, the first contact surface is only in surface-surface contact with the main plate shell unit on the left side connected with the reinforcing plate shell unit, and binding conditions are set for the surface-surface contact, the third contact surface is only in surface-surface contact with the main plate shell unit on the right side connected with the reinforcing plate shell unit, and binding conditions are set for the surface-surface contact, the second contact surface is positioned at the connecting gap of the two main plate shell units, the second contact surface is in universal contact with the two main plate shell units, the second contact surface is in contact with the main plate shell unit on the left side connected with the reinforcing plate shell unit and in contact with the main plate shell unit on the right side connected with the reinforcing plate shell unit, but because the second contact surface is in universal contact with the main plate shell units, therefore, the problem of master-slave surfaces does not exist, and the convergence of finite element analysis calculation is not influenced.
The method comprises the steps that a reinforcing plate shell unit is divided into three parts, the left part and the right part are respectively in face-to-face contact with a left main plate shell unit and a right main plate shell unit of the reinforcing plate shell unit, binding conditions are set on the face-to-face contact, the middle part of the reinforcing plate shell unit is in universal contact with the two main plate shell units, each face of the reinforcing plate shell unit is only in subordinate relation with one face, and a finite element model to be processed is more convergent when calculation is carried out.
S800, as shown in FIG. 3, applying pressure load on the inner surfaces of all the main board shell units and the reinforcing board shell units to obtain the deformation resistance of the main board shell units and the reinforcing board shell units of the finite element model to be processed; the pressure load can be water pressure, and the pressure direction of the pressure load points to the outer side of the finite element model to be processed from the central axis of the longitudinal direction of the finite element model to be processed.
The binding condition of the surface-surface contact is to set a fixed relationship between the first contact surface, the second contact surface and the third contact surface and the corresponding main board shell units, for example, the first contact surface, the second contact surface and the third contact surface are fixed on the corresponding main board shell units by fixing methods such as sticking/bolts. The binding condition is used for preventing the contact surface between two or more objects from moving relatively when the two or more objects are welded together or connected together by a bolt group, and the binding condition can be set to simulate the connection working condition.
The pressure intensity of the pressure load of the finite element model to be processed is increased linearly, and the pressure intensity P of the pressure load borne by the nth point of the finite element model to be processed n =ρgh n (ii) a Wherein rho is the liquid density of the liquid corresponding to the pressure load, the liquid corresponding to the pressure load can be water or other solvents, g is the acceleration of gravity, h n And the vertical distance from the nth point to the highest position of the pressure load, wherein the highest position of the pressure load is the highest liquid level surface of the liquid in the finite element model to be processed. At the same liquid density and gravitational acceleration, h n The larger the pressure intensity P of the pressure load received by the nth point of the finite element model to be processed n The larger.
The invention converts the main board entity unit and the reinforcing board entity unit of the assembly structure into the corresponding main board shell unit and the reinforcing board shell unit, establishes a finite element model to be processed, converts the entity unit into the shell unit, improves the calculation efficiency of the finite element model to be processed, applies displacement constraint to the bottom end of the lowest main board shell unit to simulate the scene of fixed assembly structure, divides the contact surface of each reinforcing board shell unit in the finite element model to be processed, divides the reinforcing board shell unit into a first contact surface, a second contact surface and a third contact surface according to the contact relationship between the reinforcing board shell unit and the corresponding main board, leads each reinforcing board to be simultaneously assembled with two main boards, establishes the contact relationship between the first contact surface of each reinforcing board shell unit and the main board shell unit at the first side thereof, and sets binding conditions for the contact relationship, the second contact surface is in contact relation with the two corresponding main board shell units, the third contact surface is in contact relation with the main board shell unit on the second side of the third contact surface, and binding conditions are set for surface-surface contact, so that one contact surface of the reinforcing board shell unit only serves as an auxiliary surface, and the problem that finite element model analysis and calculation cannot be converged is solved.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium, which may be disposed in an electronic device to store at least one instruction or at least one program for implementing a method of the method embodiments, where the at least one instruction or the at least one program is loaded into and executed by a processor to implement the method provided by the above embodiments.
Embodiments of the present invention also provide an electronic device comprising a processor and the aforementioned non-transitory computer-readable storage medium.
Embodiments of the present invention also provide a computer program product comprising program code means for causing an electronic device to carry out the steps of the method according to various exemplary embodiments of the invention described above in the present description, when said program product is run on the electronic device.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will also be appreciated by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A method for strength determination based on fabricated structures, the method comprising the steps of:
s100, acquiring a finite element model to be processed corresponding to the assembly type structure; the assembly type structure comprises a main board and a reinforcing board; the main boards are connected with each other, and each reinforcing board is positioned at the longitudinal connection position of two corresponding adjacent main boards; in the finite element model to be processed, the attribute of the main board shell unit corresponding to the main board is a shell unit, the attribute of the reinforcing board shell unit corresponding to the reinforcing board is a shell unit, and the main board shell unit and the reinforcing board shell unit are both of two-dimensional plane structures;
s200, respectively endowing the main board shell unit and the reinforcing board shell unit with material characteristics and section properties;
s300, applying displacement constraint to the bottom end of the main board shell unit at the lowest layer of the finite element model to be processed;
s400, dividing contact surfaces of each reinforcing plate shell unit to obtain a first contact surface, a second contact surface and a third contact surface which are sequentially arranged along the transverse direction and correspond to each reinforcing plate shell unit; the width of the first contact surface is equal to that of the third contact surface and is greater than that of the second contact surface;
s500, establishing a contact relation between the first contact surface and the main board shell unit positioned on the first side of the reinforcing board shell unit;
s600, establishing a contact relation between the second contact surface and the two main board shell units corresponding to the reinforcing board shell unit where the second contact surface is located;
s700, establishing a contact relation between the third contact surface and the main board shell unit positioned on the second side of the reinforcing board shell unit; the second side of the stiffened panel shell element is the opposite side of the first side of the stiffened panel shell element;
s800, applying pressure load on the inner surfaces of all the main board shell units and the reinforcing board shell units to obtain the deformation resistance strength of the main board shell units and the reinforcing board shell units of the finite element model to be processed; and the pressure direction of the pressure load points to the outer side of the finite element model to be processed from the central axis of the longitudinal direction of the finite element model to be processed.
2. The method of claim 1, wherein the interface partitioning comprises the steps of:
s410, determining a contact line of a gap between the reinforcing plate shell unit and the two corresponding main plate shell units;
s420, determining a second contact surface on the reinforcing plate shell unit according to the target width W and the contact line, wherein the center line of the second contact surface is overlapped with the contact line;
s430, setting a part, located on the first side of the second contact surface, of the reinforcing plate shell unit as a first contact surface;
s440, setting a part, located on the second side of the second contact surface, of the reinforcing plate shell unit as a third contact surface; the second side of the second contact surface is opposite the first side of the second contact surface.
3. The method of claim 2, wherein W = α × H; wherein alpha is a preset coefficient, and H is the width of the reinforcing plate shell unit.
4. Method according to claim 1, characterized in that the pressure strength P of the pressure load experienced at the nth point on the finite element model to be processed is a pressure strength P n =ρgh n (ii) a Wherein rho is the liquid density of the liquid corresponding to the pressure load, g is the gravity acceleration, and h n Is the vertical distance from the nth point to the highest point of the pressure load.
5. The method of claim 1, wherein the contact relationship between the second contact surface and its corresponding two main board housing units is a universal contact.
6. The method according to claim 5, wherein the contact relationship between the first contact surface and the third contact surface and the corresponding main board housing unit is surface-surface contact, and a binding condition is set for the surface-surface contact.
7. The method of claim 1, wherein the material properties include density, elastic model, poisson's ratio, yield strength; the cross-sectional property includes a thickness cross-section of the main board housing element and the stiffener housing element.
8. The method of claim 1, wherein the degrees of freedom of the displacement constraint are each 0.
9. A non-transitory computer readable storage medium having stored therein at least one instruction or at least one program, the at least one instruction or the at least one program being loaded and executed by a processor to implement the method of any one of claims 1-8.
10. An electronic device comprising a processor and the non-transitory computer readable storage medium of claim 9.
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