JP2940470B2 - Structure analysis method and structure analysis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural analysis system and, more particularly, to a structural analysis method and a structural analysis method capable of appropriately setting material properties such as tensile, compressive and bending elastic modulus used for structural analysis. Related to the device.

[0002]

2. Description of the Related Art Conventionally, when a test of an object to be analyzed, such as tensile, compression, bending, etc., is to be expressed by a structural analysis system, the physical property values of the object to be analyzed, such as tensile, compression, bending, etc. Must be entered. In this case, conventionally, when inputting the material property values, the inputting is manually performed in consideration of how to deform the analysis object. The operation of the conventional structural analysis system will be described with reference to FIG. In general, a finite element method is well known as a means for analyzing a structure. In the model creation (S41), the shape of the object is created, and the element is divided. The setting of the boundary condition (S42) sets a load and a constraint on the model. The setting of the material property value (S43) sets the material property value in the model. The analysis execution (S44) calculates a state satisfying the above condition.

[0003]

In such a conventional structural analysis system, when setting material property values, material property values are input based on past experiences and considerations. There is a problem that it is difficult to set the material properties and it is difficult to perform high-precision analysis. In addition, if only one material property value is input because the setting operation is simplified or an appropriate setting is unknown, there is a problem that an error in analysis calculation becomes large.

[0004] It is an object of the present invention to provide a structural analysis method and a structural analysis apparatus which enable setting of physical properties of a material in a structural analysis in accordance with actual conditions, and which enable accurate structural analysis. is there.

[0005] The structural analysis method of the present invention separates a plurality of elements.
Run the preliminary analysis to determine how variations to the analysis object being split, a deformation manner of the results from the elements of displacement of the nodes of the obtained element from the preliminary analysis, tensile, compression, Bending is determined, and material properties such as tensile elastic modulus, compressive elastic modulus, and bending elastic modulus are required based on the results of this determination.
Set element is characterized by carrying out the present analysis.

Further, the structural analysis apparatus of the present invention includes means for storing input material physical property values such as tensile, compressive and bending elastic moduli of the object to be analyzed, and means for performing preliminary analysis of the object to be analyzed. Changes in the nodes of the elements obtained from the results of this preliminary analysis.
From the results of the displacement, the way the element is deformed is determined by tension, compression, bending
Means for determining and classifying each of them, means for reading and setting material property values corresponding to the classified elements from the storage means, and performing the main analysis based on the set material property values. Means. In this case, the displacement of the nodes of each element, tension, compression, and means for storing a program for classifying the respective bend, said classification means performs classification on the basis of this program.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. Referring to FIG. 1, an embodiment of the present invention includes an input device 1 such as a keyboard, a data processing device 2 that operates under program control, a storage device 3 that stores information, and a main analyzer 4 that performs main analysis. And an output device 5 such as a display device. Storage device 3
Has a program storage unit 31 and a data storage unit 32. The program storage unit 31 stores in advance programs for classifying into tension, compression, and bending based on the displacement of each element. The data storage unit 32 stores a manner of deformation of each element, which is a result obtained by executing the preliminary analysis.

The data processing apparatus 2 is provided with first to fourth search means 21 to 24. The first search means 21 obtains the position of the node of each element from the deformed position obtained by executing the preliminary analysis, determines the deformation of the element from this position, and classifies tension, compression, and bending. When the deformation of the element is tensile, the second searching means 22 reads the tensile elastic modulus into the element. When the deformation of the element is compression, the third search unit 23 reads the compression elastic modulus into the element. When the deformation of the element is bending, the fourth searching means 24 reads the bending elastic modulus into the element.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. Material elastic modulus (S2
In 1), the tensile elastic modulus, the compressive elastic modulus, and the flexural elastic modulus of the material to be analyzed are input. Each elastic modulus input from the input device 1 is supplied to the data processing device 2 and stored in the data storage unit 32. The first search unit 21 performs preliminary analysis and element classification based on the program in the program storage unit 31. In the preliminary analysis (S22), a preliminary analysis for determining a manner of deformation is performed. In this preliminary analysis, the position of the node of each element is obtained from the amount of displacement of the analysis target, and the deformation of the element is determined based on the position displacement. Determination of the number of elements (S23)
Determines whether the determination of the deformation of the number of elements obtained as a result of executing the preliminary analysis has all been completed. If the processing has been completed, the process proceeds to the main analysis (S25) based on the determination result. The analysis device 4 performs the analysis based on the set elastic modulus of each element. The result of this analysis is output from the output device 5. On the other hand, the deformation determination subroutine (S24) determines the deformation of each element based on the preliminary analysis result.

The deformation determination subroutine (S24) will be described with reference to FIG. Tension (S31) determines whether the deformation of the element is tensile. If it is tensile, a tensile modulus is set (S32). The compression (S33) determines whether the deformation of the element is compression. If it is compression, set the compression modulus (S
34). In the bending (S35), a bending elastic modulus is set (S36) for an element that is not in tension or compression.

As described above, since the elastic modulus of each element is set using the result of the displacement of the node of the element obtained by executing the preliminary analysis, the elastic modulus of each element becomes clear. In addition, since the elastic modulus of each element becomes clear, even when tensile, compression, and bending phenomena are mixed, it is possible to select and analyze the elastic modulus that matches each phenomenon, and obtain more accurate results. Can be.

For example, a case where a tensile test of a material is expressed by a structural analysis system will be described as an example. Enter the tensile modulus, compressive modulus, and flexural modulus of the test material (S
21). An arbitrary elastic modulus is input, and a preliminary analysis is performed (S22). The manner of deformation is determined based on the analysis result (S24). In the tensile test, since the deformation of the element is tensile, the tensile modulus is input to each element (S32). compression,
Since there is no bending element, there is no search, and the result is output to this analysis (S23). This analysis is executed based on the output result (S25).

[0013]

As described above, the structural analysis system according to the present invention sets the elastic modulus of each element using the result of the displacement of the node of the element obtained by executing the preliminary analysis. This has the effect that the elastic modulus of each element becomes clear. In this way, the modulus of elasticity of each element becomes clear, so even if the phenomena of tension, compression and bending are mixed,
Since it is possible to select and analyze the elastic modulus corresponding to each phenomenon, more accurate results can be obtained. As a result,
Analysis in a form closer to the actual deformation becomes possible, and more accurate analysis can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a structural analysis apparatus according to the present invention.

FIG. 2 is a flowchart of a main routine of the structural analysis method of the present invention.

FIG. 3 is a flowchart showing a subroutine of FIG. 2;

FIG. 4 is a flowchart showing a conventional structure analysis method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 input device 2 data processing device 3 storage device 4 main analyzer 5 output device 21 to 24 search means 31 program storage unit 32 data storage unit

Claims (4)

(57) [Claims] 1. A preliminary analysis for judging a deformation method for an analysis target divided into a plurality of elements is performed, and the element displacement is obtained from a result of displacement of a node of the element obtained from the preliminary analysis . deformation manner is, tension, compression, and the determination of the flexural, tensile modulus on the basis of this determination result, compressive modulus,
A structural analysis method, wherein a material property value such as a flexural modulus is set as an element and the analysis is performed. 2. A means for storing inputted material property values such as tensile, compressive and bending elastic moduli of an object to be analyzed, a means for performing a preliminary analysis of the object to be analyzed, and a result of the preliminary analysis.
Based on the obtained displacement of the nodes of the element,
It is, tension, compression, means for performing a means for classifying the each determined bending, setting the material property value corresponding to the classified elements read from said means for storing, the set material properties Means for performing a main analysis based on the value. From wherein displacement of the nodes of each element, tension, compression, and means for storing a program for classifying each of the bending, the classifying unit according to claim 2 for classifying on the basis of the program structural analysis apparatus according to. 4. An input device for inputting at least respective tensile, compressive, and bending elastic moduli of the object to be analyzed, a storage device for storing the input data, and an elastic modulus of each element of the object to be analyzed. A data processing device that performs the analysis of the object to be analyzed based on the set elastic modulus, and an output device that outputs an analysis result . Each element, tension, compression, a program storage unit that stores a program for classifying each of the bending, and a data storage unit that stores the input elastic modulus of each element, the data processing device, a preliminary analysis on the analysis object, the way of deformation of the element from the result of displacement of the nodes of the elements from this preliminary analysis
Determination to tensile, compressive, and the first retrieval means for classifying each of the bending, when the deformation of the element is tensile, and a second search means for reading the tensile elastic modulus to the element, the deformation of the element At the time of compression, the third element that reads the compression modulus into the element
And a fourth searching means for reading a bending elastic modulus into the element when the deformation of the element is bending.