JP2003167925A - Structural strength evaluation support system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structural strength evaluation support system for allowing an evaluator to easily acquire required information, and to execute quick and high-quality evaluation when evaluating structural strength. <P>SOLUTION: The structural strength evaluation support system is arranged for providing properly requested information in response to a request from an evaluator terminal unit storing information required for evaluating the structural strength, and connected by a network. The system has areas for the evaluator to select and request an offer with every information, and transmits a menu image screen for systematically arranging these areas on the basis of an evaluation procedure to the terminal unit. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for supporting structural strength evaluation of various types of equipment, devices, etc., and in particular, structural strength evaluation support which enables an evaluator to easily obtain information necessary for evaluation. Regarding the system.

[0002]

2. Description of the Related Art When evaluating the structural strength of various types of equipment and devices, the evaluation is generally carried out in the procedure shown in FIG. As shown in the figure, the evaluator first
While grasping the structure of the actual machine that is the object of evaluation, the operating state and the surrounding environment are investigated (steps S81 and S82 in FIG. 8).

Next, the evaluator calculates the stress actually generated in the actual machine on the premise of the various conditions investigated above (step S83 in FIG. 8). Generally, the generated stress is often obtained by analysis or experiment using FEM (finite element method). FEM analysis is usually
The analysis process is performed using a computer system such as a workstation, and based on the condition data input by the evaluator, according to the FEM analysis program provided in the computer system.

When the generated stress in the actual machine is obtained, the evaluator selects an evaluation method suitable for the actual machine in order to evaluate how the generated stress affects the actual machine (see FIG. 8 step S84). Such selection is performed based on the structure and operating conditions of the actual machine described above. Hereinafter, the evaluation is performed according to the selected evaluation method. Specifically, first, the allowable stress in the actual machine is calculated according to the type of stress to be generated, and the calculated actual stress is compared (FIG. 8 step S85).

Next, based on the result of the comparison, whether or not a crack is generated, how the crack propagates when there is a crack, and whether or not there is a risk of fracture. Evaluations and examinations are made regarding the above (step S86 in FIG. 8). Then, the evaluator draws a conclusion as to whether or not the actual machine needs to be modified or improved based on these examination results (step S87 in FIG. 8).

Although the structural strength evaluation is performed as described above, there are various kinds of evaluation methods after obtaining the specific method of the FEM analysis and the generated stress described above. , In order to understand the contents of them and to select the evaluation method suitable for the evaluation target, the documents and reference materials were surveyed at each evaluation.

[0007]

However, in the above-mentioned conventional method, it takes a lot of time to search the above-mentioned documents and reference materials, and skill is required to perform a proper evaluation. Therefore, there is a problem that the evaluation cannot be performed immediately when a quick response is required, and there is a problem that the quality of the evaluation varies depending on the experience of the evaluator. Therefore, an environment in which the structural strength can be evaluated quickly and with high quality has been desired.

Therefore, an object of the present invention is to provide a structural strength evaluation support system which enables an evaluator to easily obtain necessary information when carrying out structural strength evaluation, and to perform quick and high quality evaluation. Is to provide.

[0009]

In order to achieve the above object, one aspect of the present invention is to store information necessary for structural strength evaluation, and to meet a request from a terminal device of an evaluator connected by a network. In response, a structural strength evaluation support system is provided to provide the requested information as appropriate, and the system has an area for the evaluator to select and request the information for each information when the information is provided. , A menu screen in which those areas are systematically arranged based on an evaluation procedure is transmitted to the terminal device. Therefore, according to the present invention, the evaluator can easily obtain the necessary information from his / her own terminal device, and can obtain the appropriate information from the systematic menu screen in the appropriate order. It becomes possible to perform high structural strength evaluation.

In order to achieve the above-mentioned object, another aspect of the present invention is to store structural strength evaluation information necessary for evaluating structural strength, from a user terminal device connected via a network. In response to the user's request for providing information, the structure strength evaluation support system for extracting the corresponding information from the structure strength evaluation information and transmitting the extracted information to the terminal device. When receiving a request, there is an area for the user to request information regarding each of stress classification, fatigue life evaluation, high temperature strength evaluation, crack stability evaluation, and fracture evaluation diagram, and the request is provided. It is characterized in that each of the areas for carrying out is transmitted to the user's terminal device a menu screen systematically arranged on the basis of the procedure when the structural strength is evaluated.

Further, in the above invention, a preferred aspect thereof relates to a region for requesting information on fatigue life evaluation of the menu screen, a region for requesting information on fatigue analysis, and a fatigue crack growth analysis. Including a region for requesting information, a region for requesting information regarding high temperature strength evaluation of the menu screen, a region for requesting information regarding creep fatigue analysis and a request for information regarding creep fatigue crack growth analysis The area for requesting information on crack stability evaluation of the menu screen, including the area for performing, requests the area for requesting information on linear fracture mechanics evaluation and the information on elastic-plastic fracture mechanics evaluation. And an area for requesting information regarding the ultimate load evaluation.

Further, in the above invention, another aspect is
Further, it is characterized in that FEM analysis information regarding the results of analysis by the finite element method is stored, and the menu screen has an area for the user to request the FEM analysis information.

Further objects and features of the present invention will be apparent from the embodiments of the invention described below.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. However, such an embodiment does not limit the technical scope of the present invention.
In the drawings, the same or similar components will be described with the same reference numerals or reference symbols.

FIG. 1 is a block diagram showing an embodiment of a structural strength evaluation support system to which the present invention is applied. The structural strength evaluation support system 1 in the figure is the structural strength evaluation support system according to the present embodiment, and the client terminal 3 of the evaluator 4 performing the structural strength evaluation via the network 2.
It is connected to and provides various information stored in the system in response to a request from the evaluator 4.

The network 2 is, for example, a LAN (Local Area Network) in a company or the Internet, and connects a plurality of client terminals 3 to the structural strength evaluation support system 1. The client terminal 3 is composed of a personal computer or the like, and is provided with a general web browser 11. The evaluator 4 who is a user of the structural strength evaluation support system 1 uses the Web browser 1
1 to access the structural strength evaluation support system 1 to receive desired information.

As shown in FIG. 1, the structural strength evaluation support system 1 includes a Web server 5, an information providing server 6, and an FEM.
It is composed of an analysis server 7 and a DB server 8. W
The eb server 5 is a part that controls transmission / reception of information via the network 2, and upon receiving an information provision request from the client terminal 3, transmits various information to the client terminal 3 according to an instruction from the information provision server 6. To do.

The information providing server 6 is a client terminal 3
In response to the information providing request of the evaluator 4 transmitted from, the corresponding information is extracted from the information stored in the DB server 8 described below and provided to the evaluator 4. Also,
When providing the information, a menu screen is provided so that the evaluator 4 can easily and accurately request the information. Further, the FEM executed by the FEM analysis server 7 described later.
The information of the EM analysis is extracted and stored in the DB server 8,
It also has a function of providing such information to the evaluator 4.

The FEM analysis server 7 is a server for executing analysis by the finite element method, and analyzes based on the analysis input file 12 (illustrated in FIG. 2) transmitted from the evaluator 4 via the client terminal 3. Perform processing,
Analysis results such as the generated stress in the analysis target are evaluated by the evaluator 4
To provide. The FEM analysis server 7 itself is
It has the same function as that of the conventional apparatus, and therefore, in the present embodiment, it is included in the structural strength evaluation support system 1.
The structure may be included in another system connected to the network 2 without being included in the structural strength evaluation support system.

Finally, the DB server 8 is a server that stores and manages various information provided by the structural strength evaluation support system 1 to the evaluator 4, and specifically, the structural strength evaluation information 9 and It stores FEM analysis information 10. The structural strength evaluation information 9 includes various kinds of information necessary for evaluating the structural strength. For example, information on stress classification for specifying the type of generated stress, information on fatigue life evaluation. , Information on crack stability evaluation, etc. Further, the FEM analysis information 10 stores information on the FEM analysis performed by the FEM analysis server 7, and as described above, this information is stored by the information providing server 6.

The structural strength evaluation support system 1 has the configuration as described above, and is specifically implemented by one or a plurality of computer systems such as personal computers and workstations.

The structural strength evaluation support system 1 according to the present embodiment described above responds to a request from the client terminal 3 connected to the network 2 by using a menu screen in which information regarding structural strength evaluation is easy to understand. It is provided so that the evaluator 4 can easily perform high quality evaluation.

FIG. 2 is a flow chart showing an example of a procedure for performing structural strength evaluation using the structural strength evaluation support system 1. Hereinafter, an evaluation procedure using the structural strength evaluation support system 1 will be described with reference to FIG. The evaluator 4 firstly examines the FEM for the actual machine to be evaluated.
Analysis is performed, but past performance information is referred to in order to determine the method. Specifically, by accessing the structural strength evaluation support system 1 from the client terminal 3 of its own using the Web browser 11 and selecting a predetermined portion (area) of the displayed menu screen,
Request to view the EM analysis information 10 (step S in FIG. 2).
1). FIG. 3 is a diagram showing an example of the menu screen displayed on the client terminal 3. The menu screen will be described in detail later, but the predetermined portion (area) selected by the evaluator 4 is a portion (area) indicated by x in FIG.

In the structural strength evaluation support system 1 that has received the browsing request, the information providing server 6 extracts the FEM analysis information 10 stored in the DB server 8 and evaluates the information via the Web server 5. It is transmitted to the client terminal 3 of the person 4 (step S2 in FIG. 2). Figure 4 shows FE
It is a figure showing an example of M analysis information 10. As shown in the figure, in the FEM analysis information 10, record information of past FEM analysis is recorded for each case.
The date and time of the implementation, the name of the implementer, and the analysis keyword information are recorded.

The "element type" of the analysis keyword is the type of the element when the element is divided into a limited number of elements and analyzed, and examples thereof include a two-dimensional triangular element and a two-dimensional square element. Further, the “load condition” and the “boundary condition” are conditions such as the load applied to the model to be analyzed and the constraint state at the boundary. In addition, "linear or non-linear" indicates an analysis condition, and indicates whether the analysis target behaves in the elastic region or the plastic region is also considered.

When the FEM analysis information 10 is transmitted and displayed on the client terminal 3, all the stored FEM analysis information 10 is simply displayed as a list, and in addition to the request from the evaluator 4. DB for necessary information only
A method of extracting from the server 8 and displaying in the requested order may be adopted.

Next, the evaluator 4 examines the analysis method to be performed with reference to the FEM analysis information 10 displayed on the client terminal 3 (step S3 in FIG. 2). In addition,
As described with reference to FIG. 4, not all information items related to the analysis performed in the past are recorded in the FEM analysis information 10. Therefore, the evaluator 4 may use the client terminal 3 as necessary. Information can be directly obtained from the performer based on the name of the performer of the analysis displayed.

When the FEM analysis method is determined by the above examination, the evaluator 4 prepares an FEM analysis by creating an analysis model, input data, etc. based on the method (step S4 in FIG. 2). ). Then, the analysis input file 12 is created based on the result (step S5 in FIG. 2). The analysis input file 12 is a file in which input data necessary for causing the computer system (FEM analysis server 7) to execute FEM analysis is stored, and an example thereof is shown in FIG. As shown in the figure, the analysis input file 12 contains the above-mentioned F
The EM analysis information 10 includes all information that is a prerequisite for analysis, including information on "element type", "load condition", "boundary condition", and "analysis condition".

Next, the evaluator 4 sends the created analysis input file 12 to the structural strength evaluation support system 1 to request execution of FEM analysis (step S6 in FIG. 2). In response to the request, the FEM analysis server 7 of the structural strength evaluation support system 1 executes FEM analysis processing based on the transmitted analysis input file 12 (FIG. 2).
Step S7). The contents of the FEM analysis process are the same as those in the conventional art, and thus the description thereof is omitted here.

When the FEM analysis process is completed, the FE
The M analysis server 7 returns the analysis result such as the stress distribution in the target model to the client terminal 3 (step S8 in FIG. 2). The evaluator 4 who has received the analysis result can grasp the possible generated stress occurring in each place of the actual machine to be evaluated from the result (step S9 in FIG. 2).

On the other hand, in the FEM analysis server 7, when the FEM analysis processing is completed, the information providing server 6
Accesses the analysis input file 12 of the item for which the FEM analysis has been performed at a predetermined timing, and extracts the information to be stored as the above-mentioned FEM analysis information 10 from the file (step S10 in FIG. 2). Specifically, information is extracted for the information items related to the analysis keyword illustrated in FIG. The extracted information is stored in the DB server 8 as the FEM analysis information 10 by the information providing server 6 (step S11 in FIG. 2).

The evaluator 4 who has grasped the generated stress then evaluates how the stress affects the target actual machine. Therefore, in order to obtain various kinds of information for such evaluation, the evaluator 4 accesses the structural strength evaluation support system 1 from the client terminal 3 and requests browsing of the structural strength evaluation information (step S1 in FIG. 2).
2). When the generated stress in the target actual machine is obtained by a method other than FEM analysis, for example, an experiment, the present structural strength evaluation support system 1 is used from step S12.

In the structural strength evaluation support system 1 that has received the browsing request, the information providing server 6 first transmits a menu screen to the client terminal 3 (step S13 in FIG. 2). The menu screen is a screen for allowing the evaluator 4 to select the information to be provided, and is the screen described in step S1. The structural strength evaluation support system 1 is characterized by this menu screen, and the contents will be described below based on the menu screen illustrated in FIG.

As shown in the figure, in the menu screen,
Information that can be referred to is classified, and a selection area (a portion, b portion, etc. in FIG. 3) for the evaluator 4 to select and request information provision is provided for each classified information item. . Further, those selection areas are systematized by a line with a direction indicated by n in the figure and arranged in the menu screen. Such arrangement and systematization are performed based on the order of information to be referred to when performing structural strength evaluation. Therefore, the evaluator 4 can refer to the necessary information in proper order without waste from this menu screen, and can easily and quickly obtain the information. For example, the evaluator 4 first selects the “stress classification” selection area (part a in FIG. 3) to obtain information, and then, when the evaluation target is a high temperature environment, “high temperature strength evaluation. The selection area (section c in FIG. 3) of "" is selected to obtain information.

Next, the content of each information provided to the evaluator 4 by selecting each selection area provided on the menu screen will be described. First, in the selected area “stress classification” shown in part a of FIG. 3, information about the stress classification and the allowable stress for each classified stress is provided, and the evaluator 4 determines which stress is occurring in the actual machine. It belongs to the classification and can know how to obtain the allowable stress. Further, in the selected area “fatigue life evaluation” shown in part b of FIG. 3, a crack is generated in the material due to repeated stress,
Information is provided regarding a method of life evaluation, that is, fatigue life evaluation, for a progressive repetition-dependent fracture phenomenon. Specifically, the selected area "fatigue life evaluation" has two selected areas shown in parts g and h in the figure. In the selected area "fatigue analysis", the structural members are repeatedly applied to the structural member at normal temperature by repeated load. Information is provided regarding fatigue analysis for crack initiation. The selected area "Fatigue Crack Propagation Analysis" also provides information on fatigue crack growth analysis that requires cracks to grow due to the repeated action of a load after a crack has occurred in a structural member at room temperature.

Next, in the selected area “high temperature strength evaluation” shown in part c of FIG. 3, information on a high temperature strength evaluation method in a temperature area higher than normal temperature such as high temperature fatigue, thermal fatigue, creep rupture, etc. is provided. . In this selected area "high temperature strength evaluation",
Specifically, there are two selected regions shown in the parts i and j in the figure. In the selected region "creep fatigue analysis", the creep fatigue that is required to generate cracks in the structural member due to the repeated action of load at high temperature Information about the analysis is provided. In addition, the selected area "Creep Fatigue Crack Growth Analysis" provides information on creep fatigue crack growth analysis that requires cracks to grow under repeated loading after a crack is generated in a structural member at high temperature. It

Further, in the selected area "crack stability evaluation" shown in parts d and e of FIG. 3, whether the crack grows stably or unstable in response to changes in load and displacement. Information is provided on how to evaluate crack stability to determine
In addition, in the "crack stability evaluation" in the part d of the figure, specifically,
There is a selected area “Linear fracture mechanics evaluation (brittle fracture)” shown in the k part. From this, the stress intensity factor K and fracture toughness value K _{C of the} brittle material obtained from the structure, crack shape, and applied stress are calculated.
Information is provided regarding linear fracture mechanics evaluations that compare the two to evaluate whether or not unstable fracture occurs. In addition, in the e part of the figure, the selected regions “Elasto-plastic fracture mechanics evaluation (ductile fracture)” and “Ultimate load evaluation (plastic collapse)” shown in the l part and the m part are prepared. , Information on elasto-plastic fracture mechanics evaluation to evaluate whether or not an unstable fracture occurs by comparing the J-integral obtained from the structure, crack shape and acting stress in the ductile material with the fracture toughness value J _C of the material. Information is provided on the ultimate load evaluation that compares the allowable stress of the material with the load stress obtained from the puddle structure, the crack shape, and the acting stress to evaluate whether or not the material undergoes unstable fracture.

Further, in the selected area "fracture evaluation diagram" shown in part f of FIG. 3, the evaluation point determined by using the parameters concerning the fracture toughness and the parameters concerning the plastic collapse condition is compared with the fracture evaluation curve to determine the fracture. Provides information on the fracture evaluation diagram that estimates the presence or absence of

In addition to the selection areas described above, as shown in FIG. 3, selection areas such as "impact evaluation", "buckling evaluation", "environmental strength evaluation", "residual stress evaluation" may be provided. . Also,
A selection area (x in FIG. 3) for providing the FEM analysis information 10 described above is also prepared.

Next, returning to FIG. 2, information of the evaluator 4 is obtained using the menu screen described above. Specifically, necessary information is sequentially browsed by selecting the selection area corresponding to desired information from the menu screen displayed on the client terminal 3 (step S14 in FIG. 2). For example, as an example, first, the selection area “stress classification” on the menu screen is selected (step S1 in FIG. 2).
5). In response to this operation, the structural strength evaluation support system 1
The information providing server 6 of the DB server 8 for the stress classification
Information stored in the structural strength evaluation information 9 is transmitted to the client terminal 3 of the evaluator 4 (step S16 in FIG. 2).

FIG. 5 is a diagram showing an example of information transmitted from the structural strength evaluation support system 1 and displayed on the client terminal 3 when the selected area “stress classification” is selected. As shown in the figure, the displayed information includes information on stress classification and allowable limits, and a selection area (underlined portion such as y portion in the figure) for obtaining more detailed information is also prepared. . Therefore, when the evaluator 4 wants to browse the detailed information, further information can be obtained by selecting the selection area.

FIG. 6 is a diagram showing an example of information displayed when the y portion is selected in FIG. Information about stress classification by structure is included, and similarly to the case of FIG. 5, a selection area (underlined portion such as z portion in the drawing) for displaying the following information is also prepared. FIG. 7 is a diagram showing an example of information displayed when the z section is selected in FIG. Here, the content of “Note 1” in the remarks column of FIG. 6 is shown.

As described above, the structural strength evaluation support system 1
The screen of the information provided by is provided with a link according to the content, and the evaluator 4 can easily obtain the related information by a continuous operation. The above-mentioned FE
After the M analysis is performed (step S7 in FIG. 2), the structural strength evaluation support system 1 is automatically transmitted when the selected area “stress classification” is selected from the menu screen or the menu screen. The information to be transmitted may be transmitted to the client terminal 3.

In the above-mentioned example, the evaluator 4 who has sufficiently obtained the information about the “stress classification”, then, based on the information,
The allowable stress in the target actual machine is obtained, and compared with the generated stress obtained by the above-mentioned FEM analysis and the like, and the structural strength evaluation is advanced based on the result. For example, when the target actual machine is repeatedly subjected to a load at room temperature, the “fatigue analysis” (g part in FIG. 3) on the menu screen is selected (step S17 in FIG. 2), and the structural strength evaluation support system 1 is selected. The information regarding the fatigue life evaluation transmitted from is browsed (step S18 in FIG. 2).

Thereafter, similarly, necessary information corresponding to the case is obtained using a systematic menu screen, and the evaluation work is sequentially advanced based on the obtained information (step S19 in FIG. 2). Then, a conclusion about the structural strength evaluation for the target actual machine is derived (step S2 in FIG. 2).
0). As described above, the evaluation using the structural strength evaluation support system 1 for the target actual machine is completed, and measures are taken for the actual machine based on the result.

As described above, by using the structural strength evaluation support system 1 according to the present embodiment, the evaluator 4 can easily obtain appropriate information by using a systematic and easy-to-understand menu screen. The structural strength can be quickly evaluated with high quality. In addition, since the information when the FEM analysis is performed is automatically stored and provided to the user of the structural strength evaluation support system 1, it is possible to easily obtain the information regarding the FEM analysis method.

Although the system for providing both the FEM analysis information 10 and the structural strength evaluation information 9 is used in the present embodiment, a system for providing only the structural strength evaluation information 9 may be used. The same effect can be obtained.

The protection scope of the present invention is not limited to the above-mentioned embodiments, but extends to the inventions described in the claims and their equivalents.

[0049]

As described above, according to the present invention, the evaluator can easily obtain necessary information from his / her terminal device, and
Since appropriate information can be obtained in an appropriate order from an easy-to-understand menu screen, it becomes possible to quickly perform high-quality structural strength evaluation.

[Brief description of drawings]

FIG. 1 is a configuration diagram according to an embodiment of a structural strength evaluation support system to which the present invention is applied.

FIG. 2 is a flowchart showing an example of a procedure for performing structural strength evaluation using the present structural strength evaluation support system 1.

FIG. 3 is a diagram showing an example of a menu screen displayed on the client terminal 3.

FIG. 4 is a diagram showing an example of FEM analysis information 10.

FIG. 5 is a diagram showing an example of information displayed on the client terminal 3 when the selection area “stress classification” on the menu screen is selected.

FIG. 6 is a diagram showing an example of information displayed when the y portion is selected in FIG.

FIG. 7 is a diagram showing an example of information displayed when the z section is selected in FIG.

FIG. 8 is a diagram exemplifying a general procedure for structural strength evaluation.

[Explanation of symbols]

1 Structural strength evaluation support system 2 network 3 client terminals 4 Evaluator 5 Web server 6 Information server 7 FEM analysis server 8 DB server 9 Structural strength evaluation information 10 FEM analysis information 11 Web browser 12 Analysis input file

Claims (3)

[Claims] 1. Structural strength evaluation information necessary for evaluating structural strength is stored, and the structural strength is responded to in response to an information provision request from the user's terminal device connected via a network. A structural strength evaluation support system that extracts relevant information from the evaluation information and transmits the extracted information to the terminal device, wherein stress classification, fatigue life evaluation, high temperature strength when receiving an information provision request from the user. Each of the areas for requesting the user has information for each of the evaluation, the crack stability evaluation, and the fracture evaluation diagram, and each area for requesting the structural strength is evaluated. A structural strength evaluation support system, which transmits a menu screen systematically arranged based on the procedure of 1. to the user's terminal device. 2. The area for requesting information about fatigue life evaluation of the menu screen according to claim 1, wherein the area for requesting information about fatigue analysis and the area for requesting information about fatigue crack growth analysis. The area for requesting information on the high temperature strength evaluation of the menu screen includes an area for requesting information on creep fatigue analysis and an area for requesting information on creep fatigue crack growth analysis. Including, the area for requesting information about the crack stability evaluation of the menu screen, an area for requesting information about linear fracture mechanics evaluation, and an area for requesting information about elasto-plastic fracture mechanics evaluation, A structural strength evaluation support system including a region for requesting information on ultimate load evaluation. 3. The FEM analysis information according to claim 1 or 2, further comprising FEM analysis information relating to the results of analysis by the finite element method, wherein the menu screen has an area for the user to request the FEM analysis information. A structural strength evaluation support system characterized by having.