JP6493640B1 - Evaluation method and apparatus, and recording medium - Google Patents

Abstract

  A method of evaluating a load generated at a deformed portion of a member to be measured (10), wherein the amount of change and strain of internal energy for each analysis point of the member to be measured (10) in a predetermined time interval and the entire analysis point Calculate the load contribution for each strain section of the member to be measured (10) by calculating the average displacement amount of (step S3) and using the calculated change amount of internal energy, strain amount, and average displacement amount. (Steps S4 to S6). According to this configuration, the performance of the member to be measured can be appropriately evaluated in a short time and in a relatively simple manner.

Description

  The present invention relates to an evaluation method and apparatus, and a recording medium.

  BACKGROUND ART Conventionally, weight reduction of a car body of a car has been promoted as one method for improving the fuel consumption of the car. On the other hand, in consideration of the collision safety of the car, the car body of the car absorbs the collision energy by the deformation of a part of the frame members at the time of collision, and keeps the survival space by not deforming the strong frame members. It is designed as.

Winter, G .: Strength of thin steel compression flanges, Trans. ASCE, Vol. 112, pp. 527-554, 1947. Winter, G .: Performance of thin steel compression flanges, Preliminary Publication, 3rd Congress of IABSE, Liege, pp. 137-148, 1948.

  In a vehicle body of an automobile, it is necessary to properly design the necessary load for the required deformation in the framework member responsible for the deformation due to the collision. However, in the past, since the evaluation was performed based only on the yield stress of the skeletal member, it has been difficult to properly evaluate the performance of the skeletal member. On the other hand, although it is possible to perform appropriate evaluation by conducting a numerical analysis in detail on the measurement target member corresponding to the skeletal member, it takes a lot of time and labor and is not realistic.

  The present invention has been made in view of the above problems, and it is a highly reliable evaluation method and record that enables the performance of a member to be measured to be appropriately evaluated easily in a short time by a relatively simple method. It aims to provide a medium and an evaluation device.

  In order to solve the above-mentioned subject, as a result of earnest examination, it came to the aspects of the invention shown below. The gist of the present invention is as follows.

1. A first step of calculating an amount of change in internal energy for each analysis point of the member to be measured in a predetermined time interval, and an average displacement amount of the entire analysis point;
Using the calculated change amount of the internal energy and the average displacement amount, the change amount of the internal energy for each analysis point is divided by the average displacement amount, and a load component for each analysis point of the member to be measured A second step of calculating
Evaluation method characterized by including.
2. The first step calculates a strain amount for each of the analysis points,
The method further includes a third step of adding the load component for each strain section of the member to be measured according to the strain amount for each analysis point to calculate the degree of load contribution for each strain section. 1. Evaluation method described in.
3. The method further includes a fourth step of displaying the load component of the member to be measured. Evaluation method described in.
4. In the fourth step, the load component for each analysis point is displayed as an image in a color map. Evaluation method described in.
5. The method further includes a fifth step of displaying the degree of load contribution calculated for each strain section. Evaluation method described in.
6. The predetermined time interval is determined based on a load displacement curve of the member to be measured. To 5. The evaluation method according to any one of the above.
7. The predetermined time interval is a time interval corresponding to the maximum load in the load displacement curve. Evaluation method described in.
8. Before the first step, collision analysis is performed on the measured member;
The first step is characterized in that the amount of change in the internal energy for each analysis point, the amount of strain, and the average amount of displacement are calculated based on the result of the collision analysis. Evaluation method described in.
9. The load contribution degree for each strain section is multiplied by the true stress of the member to be measured for each strain section, and the multiplication value for each strain section is added to calculate an evaluation value of the member to be measured. The method further includes a sixth step. , 5. , 8. The evaluation method according to any one of the above.
10. A first step of calculating an amount of change in internal energy for each analysis point of the member to be measured in a predetermined time interval, and an average displacement amount of the entire analysis point;
Using the calculated change amount of the internal energy and the average displacement amount, the change amount of the internal energy for each analysis point is divided by the average displacement amount, and a load component for each analysis point of the member to be measured A second step of calculating
A computer readable recording medium having a program recorded thereon for causing a computer to execute.
11. The first step calculates a strain amount for each of the analysis points,
The program further includes a third step of adding the load component for each strain section of the member to be measured according to the strain amount for each analysis point, and calculating a load contribution degree for each strain section. 10. Make it run on a computer 10. The recording medium as described in.
12. The program further causes a computer to execute a fourth step of displaying the load component of the measured member. The recording medium as described in.
13. 12. The fourth step is characterized in that the load component for each of the analysis points is displayed as an image as a color map. The recording medium as described in.
14. 11. The program causes the computer to further execute a fifth step of displaying the degree of load contribution calculated for each strain section. The recording medium as described in.
15. The predetermined time interval is determined based on a load displacement curve of the member to be measured. -14. The recording medium according to any one of the above.
16. 15. The predetermined time interval is a time interval corresponding to the maximum load in the load displacement curve. The recording medium as described in.
17. Before the first step, collision analysis is performed on the measured member;
11. The first step is characterized in that the amount of change in the internal energy for each analysis point, the amount of strain, and the average amount of displacement are calculated based on the result of the collision analysis. The recording medium as described in.
18. The program multiplies the load contribution degree for each strain section by the true stress of the member to be measured for each strain section, adds the multiplication value for each strain section, and evaluates the member to be measured. Making the computer further execute a sixth step of calculating a value. , 14. , 17. The recording medium according to any one of the above.
19. A first calculator configured to calculate an amount of change in internal energy for each analysis point of the member to be measured in a predetermined time interval, and an average displacement amount of the entire analysis point;
Using the calculated change amount of the internal energy and the average displacement amount, the change amount of the internal energy for each analysis point is divided by the average displacement amount, and a load component for each analysis point of the member to be measured A second calculation unit that calculates
An evaluation device characterized by including.

  According to the present invention, it is possible to appropriately evaluate the performance of the member to be measured easily in a short time by a relatively simple method.

FIG. 1 is a block diagram showing a schematic configuration of an evaluation device according to the first embodiment. FIG. 2 is a flowchart showing the evaluation method according to the first embodiment in the order of steps. FIG. 3A is a schematic side view showing a test in performing collision analysis. FIG. 3B is a schematic cross-sectional view showing a test when performing collision analysis. FIG. 4 is a characteristic diagram showing a load displacement curve of a predetermined steel material. FIG. 5 is a characteristic diagram showing the degree of load contribution for each strain section. FIG. 6 is a characteristic diagram showing the correlation (stress-strain curve) between the amount of strain and the true stress (deformation resistance) of each steel type. FIG. 7 is a view showing the yield stress and strength of each steel type. FIG. 8A is a characteristic diagram showing the results of performance evaluation of the steel types according to Comparative Example 1. FIG. 8B is a characteristic diagram showing the results of performance evaluation of the steel types according to Comparative Example 2. FIG. 8C is a characteristic diagram showing the results of performance evaluation of the steel types according to the first embodiment. FIG. 9 is a block diagram showing a schematic configuration of a display device according to the second embodiment. FIG. 10 is a flowchart showing the display method according to the second embodiment in the order of steps. FIG. 11A is a schematic side view showing a test when performing collision analysis. FIG. 11B is a schematic cross-sectional view showing a test for performing collision analysis. FIG. 12 is a characteristic diagram showing a load displacement curve of a predetermined steel material. FIG. 13 is a schematic view showing a state of visualizing the degree of load contribution in the measured member when the measured member is deformed. FIG. 14 is a schematic view showing an internal configuration of the personal user terminal device.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

First Embodiment
FIG. 1 is a block diagram showing a schematic configuration of an evaluation device according to the present embodiment. FIG. 2 is a flowchart showing the evaluation method according to the present embodiment in the order of steps.
This evaluation device is for evaluating the load generated at the deformed portion of the member to be measured, and includes the collision analysis unit 1, the first calculation unit 2, the second calculation unit 3, the display unit 4, and the third calculation unit 5. Have.
The collision analysis unit 1 performs collision analysis on a measured member by numerical analysis. The first calculation unit 2 calculates the change amount and the strain amount of the internal energy for each analysis point, and the average displacement amount of the whole analysis point. The second calculation unit 3 calculates a load component for each analysis point, and adds the load components for each strain section. The display unit 4 includes, for example, a predetermined display, and displays the calculated load contribution degree. The third calculator 5 performs performance evaluation by multiplying the load contribution and the true stress.

When performing collision analysis, a collision test as shown in FIGS. 3A and 3B is performed. FIG. 3A is a schematic side view, and FIG. 3B is a schematic cross-sectional view.
A hat-shaped member 10 is used as a member to be measured. The hat-shaped member 10 is formed by overlapping the base material 11 which is a hat-shaped cross-section shaped steel plate formed into a hat-type and the base material 12 which is a flat steel plate on the flat flange surface 13 a of the flange portion 13. Is a structural member having a hat-shaped closed cross-section structure in which the two are joined by spot welding. The hat-shaped member 10 has, for example, a length of 800 mm, the upper surface width of the base material 11 is 80 mm, both ends are R5 mm, the width between the flange portions 13 is 130 mm, the height is 60 mm, and the side slope is 5 °. .

  In this embodiment, the hat-shaped member 10 is supported by the fixing jigs 14 and 15, the distance between the supporting points of the R 30 mm fixing jigs 14 and 15 is 600 mm, and the R 50 mm impactor 16 is 7.2 km from the base material 11 side. Perform a 3-point bending test by pressing at a constant speed of / h.

  Create a finite element method (FEM) model that reproduces the conditions of the above collision test. First, the collision analysis unit 1 executes collision analysis of the member to be measured by numerical analysis using this FEM model (step S1). This numerical analysis is a method that is effective for analysis and evaluation of collision analysis and collision performance. Instead of the finite element method, for example, a difference method or a particle method can also be used.

  Subsequently, the first calculation unit 2 determines the history of the internal energy, the history of the amount of distortion, and the displacement of the predetermined time interval to be evaluated for all the analysis points (elements of the finite element method) of the measured member. The history of quantity is collected (step S2). The analysis point is the center (centroid) point in an element of the finite element method. Internal energy is strain energy generated at an analysis point of a measured member by elastic-plastic deformation. As described later, in order to calculate the amount of change in internal energy, it is necessary to acquire the history of internal energy in a predetermined time section at each analysis point. Also, as described later, in order to calculate the strain amount (here, the time average value of the strain amount in a predetermined time section of each analysis point. Hereinafter, it is referred to as a representative strain amount), the strain amount which changes from moment to moment Need to get a history of Also, in order to calculate the average displacement amount as described later, it is necessary to acquire the history of the displacement amount of a predetermined time section at each analysis point.

  Subsequently, the first calculation unit 2 calculates the change amount of the internal energy and the representative strain amount at each analysis point, and the average displacement amount of the entire analysis point (step S3). Specifically, the first calculator 2 calculates the amount of change in internal energy at each analysis point based on the collected history of internal energy. Further, the first calculator 2 calculates the representative strain amount at each analysis point based on the collected history of strain amounts. Further, the first calculation unit 2 calculates an average displacement amount of the entire analysis point of the member to be measured based on the collected history of displacement amounts at the respective analysis points. As the amount of change of the internal energy, an increment calculated from previous and subsequent time steps may be used. It is preferable to use equivalent plastic strain as a representative strain amount.

  The predetermined time interval is arbitrarily determined based on the load displacement curve of the measurement target member as shown in FIG. By using the load displacement curve, it is possible to know the necessary member properties of the member to be measured and the change in the rough deformation state. Here, the case where the maximum load (peak load) which is an important characteristic of load evaluation in the load-displacement curve is regarded as the load contribution evaluation timing is exemplified, and a time interval corresponding to the peak load is selected. This time interval is desirably, for example, one tenth or less of the entire analysis time, and in this embodiment, is about 250 times the entire analysis time. Of course, if a load other than the peak load is selected at the load contribution evaluation timing, a time section corresponding to the selected load is selected. The load displacement curve may be known as to the material of the member to be measured, or may be newly created according to the member to be measured.

  The total load F of the member to be measured is expressed as the following equations (1) to (3). Here, U is the internal energy of the entire analysis point of the member to be measured, x is the average displacement, and n is the number of analysis points. In the present embodiment, as the “displacement amount”, not the displacement amount for each analysis point but the average displacement amount x which is one representative value in the member to be measured is used.

The total load F is approximated by the displacement derivative of the internal energy U according to equation (1). From equation (2), U is the sum of U _n at each analysis point for _n . This is the sum for n displacement derivative of U _n at each analysis point from equation (3). That is, each term of equation (3) represents a load component (load contribution) at a predetermined analysis point. The load component can be approximated as a value (a change amount of internal energy / average displacement amount) obtained by dividing the change amount of internal energy at each analysis point by the average displacement amount. The representative strain amount at each analysis point is calculated together with the change amount and the average displacement amount of the internal energy in step S2. Then, the contribution to the load in each strain section can be evaluated by adding the load components for each strain section to be evaluated.

  Subsequently, the second calculation unit 3 calculates load components at each analysis point (step S4). Each load component is obtained by calculating (the amount of change in internal energy) / (the amount of average displacement) using the amount of change in the internal energy and the average amount of displacement calculated in step S3 as described above. In the present embodiment, (the amount of change in internal energy) / (the amount of average displacement) at each analysis point is calculated using the displacement representing the predetermined time interval as the average amount of displacement of the member to be measured. When using the displacement amount for each analysis point as the displacement amount of the measured member, the load point of the measured member moves when the measured member collides (when the object collides with the stationary measured member) Although the load component can be calculated, when the measured member collides (when the measured member collides with a stationary object), the load component can not be calculated because the load point does not move. On the other hand, in the present embodiment, by using the average displacement amount as the displacement amount of the measured member, calculation of the load component is performed not only when the measured member collides but also when the measured member collides. It is possible, and the performance of the member to be measured can be evaluated without undue effort.

  Subsequently, the second calculation unit 3 adds the load components at each analysis point calculated in step S3 to the representative strain amounts acquired in step S3 and adds them for each strain section (step S5). Thereby, the load contribution degree for each strain section is calculated. The strain section is a strain width when arranging strain generated at each analysis point of the member to be measured according to its size.

Subsequently, the display unit 4 displays the calculated load contribution degree for each strain section on a display or the like (step S6). By displaying each load contribution, it is possible to obtain information on, for example, a member in which the low strain region is important or a member in which the high strain region is important, and it can be used for material selection. The degree of load contribution may be expressed as a percentage (%) per strain section with respect to the total value of all load components. An example in which the load contribution degree is displayed as a percentage is shown in FIG. In FIG. 5, the strain section is divided into 1% to 15% representative strain amounts every 1%, and the load contribution in each strain section is displayed as a percentage.
The display unit 4 may display load components at each analysis point obtained in step S4.

  Although the load contribution originally shows different values depending on the material, it was found by the present inventors that the difference in load contribution between different materials is extremely small. According to this finding, it can be said that the degree of load contribution is a value substantially independent of the material. Therefore, once the degree of load contribution to the load at the time of collision using a certain material is determined, it is possible to easily estimate the load when using another material.

  Subsequently, the third calculator 5 uses the correlation between the amount of strain in the material of the member to be measured and the true stress (deformation resistance) to determine the degree of load contribution for each strain section, and The evaluation value of the member to be measured is calculated by multiplying by the true stress and adding the multiplication value for each strain interval (step S7).

  The degree of load contribution for each strain section is a value for evaluating what strain section is generated from what percentage of the load. In ordinary metal materials, due to work hardening phenomenon that becomes hard due to deformation, deformation resistance (stress) activated by strain differs. Therefore, in order to evaluate the performance of the entire material, the load contribution in each strain section is multiplied by the true stress of the member to be measured in each strain section for all strain sections, and the sum is calculated. By making this total the evaluation value of the member to be measured, the degree of load contribution does not depend on the material. For example, even if the material is changed, if the stress-strain relationship of the material is grasped, the material Can be evaluated with high accuracy, and material selection can be performed easily.

  In the present embodiment, as described above, the time interval corresponding to the peak load is selected as the predetermined time interval, but it is possible to select the time interval corresponding to any load. In that case, calculation of the degree of load contribution in each strain section and calculation of the evaluation value of the member to be measured are performed corresponding to any relevant time section.

Here, with respect to measured members of different steel types A, B, and C, evaluation results are calculated according to this embodiment based on comparison with various comparative examples.
The correlation (stress-strain curve) between the amount of strain and the true stress (deformation resistance) of steel types A, B, and C is shown in FIG. The yield stress and strength of steel type A, steel type B and steel type C are shown in FIG.

The comparative example 1 is the conventional method of evaluating the proof stress at the time of bending deformation of a to-be-measured member (refer nonpatent literature 1, 2).
Bending deformation at the time of collision of a thin plate structural member such as an automobile usually occurs by buckling at the time of plastic deformation. Therefore, the definition of the weak part and the strong part is determined by the sum of the proof stress (F) of each side obtained by the following equations (4) and (5) with respect to the plane in the bending (compression side) . Here, C is an effective width, σ _y is a yield stress, t is a plate thickness, E is a Young's modulus, and w is a plate width.

  In the method of Comparative Example 1, in the case of a steel material, the Young's modulus is almost constant, so only the yield stress is reflected on the material properties of the member to be measured. Also, this method can estimate only the peak load.

Comparative Example 2 is a conventional method in which numerical analysis is performed on a measured member in detail to perform evaluation. Specifically, using the information on the shape of members shown in FIGS. 3A and 3B and the boundary conditions, numerical analysis is performed multiple times while changing the characteristics of the material, load-displacement curves are calculated from the respective results, and peak loads are calculated. It is a way to get.
In the method of Comparative Example 2, although it is possible to make an appropriate evaluation, it takes a lot of time and effort.

The performance evaluation results of steel type A, steel type B, and steel type C are shown in FIGS. 8A to 8C. FIG. 8A shows the evaluation result of Comparative Example 1, FIG. 8B shows the evaluation result of Comparative Example 2, and FIG. 8C shows the evaluation result of this embodiment.
In Comparative Example 1, since the judgment criterion of the performance evaluation is only yield stress, steel type A was evaluated to have the best performance in the order of steel type A, steel type B, and steel type C based on FIG.
In Comparative Example 2, steel type B was evaluated as having the best performance in the order of steel type B, steel type A, and steel type C. This is considered to be a proper evaluation.
In this embodiment, steel type B was evaluated as having the best performance in the order of steel type B, steel type A, and steel type C. This evaluation is equivalent to Comparative Example 2, and unlike Comparative Example 1, is considered to be a proper evaluation.

  As described above, according to the present embodiment, the relationship between the deformation resistance and load of each strain section which is the source of deformation resistance in the member to be measured is quantified, and it is easily achieved in a short time by a relatively simple method. It becomes possible to appropriately evaluate the performance of the member to be measured.

Second Embodiment
FIG. 9 is a block diagram showing a schematic configuration of an evaluation device according to the present embodiment. FIG. 10 is a flowchart showing the evaluation method according to the present embodiment in the order of steps. 9 and FIG. 10, the same components and steps as in FIG. 1 and FIG. 2 of the first embodiment are assigned the same reference numerals and detailed explanations thereof will be omitted.

This evaluation device visualizes and displays the load generated at the deformed portion of the member to be measured, and includes a collision analysis unit 1, a first calculation unit 2, a second calculation unit 3, and a display unit 21.
The collision analysis unit 1 performs collision analysis on a measured member by numerical analysis. The first calculator 2 calculates the amount of change in internal energy, the amount of strain, and the average amount of displacement for each analysis point. The second calculator 3 calculates a load component for each analysis point. The display unit 21 includes, for example, a predetermined display, and displays load components for each calculated analysis point.

When performing collision analysis, a collision test as shown in FIGS. 11A and 11B is performed. 11A is a schematic side view, and FIG. 11B is a schematic top view.
The rectangular pipe member 20 is used as a member to be measured. The square tube member 20 is a square pillar shaped hollow member made of, for example, a steel plate of 980 MPa class, for example, 300 mm in length, 50 mm in both vertical width and horizontal width, and R5 mm in four corners. In the present embodiment, a collision test is performed by causing a weight of, for example, 1 ton to collide with the upper portion of the rectangular tube member 20 at a speed of, for example, 12 km / h.

  Create a finite element method (FEM) model that reproduces the conditions of the above collision test. Step S1 similar to FIG. 2 of the first embodiment is performed. That is, the collision analysis unit 1 executes the collision analysis of the member to be measured by numerical analysis using this FEM model.

  Then, step S2 similar to FIG. 2 of the first embodiment is performed. That is, the first calculation unit 2 determines the history of internal energy, the history of strain amount, and the displacement amount of a predetermined time interval to be evaluated for all analysis points (elements of the finite element method) of all the measurement members. To collect the history of

  Then, step S3 similar to FIG. 2 of the first embodiment is performed. That is, the first calculation unit 2 calculates the amount of change in internal energy and representative strain amount at each analysis point, and the average displacement amount of the entire analysis point (step S3).

  The predetermined time interval is arbitrarily selected based on the load displacement curve of the measurement target member as shown in FIG. A time interval corresponding to the selected load is selected. The load displacement curve may be known as to the material of the member to be measured, or may be newly created according to the member to be measured. This time interval is desirably, for example, one tenth or less of the entire analysis time, and in this embodiment, is about 250 times the entire analysis time.

  Similar to the first embodiment, the total load F of the member to be measured is expressed as shown in Formula (1) to Formula (3). In the present embodiment, as the “displacement amount”, not the displacement amount for each analysis point but the average displacement amount which is one representative value in the member to be measured is used.

  Then, step S4 similar to FIG. 2 of the first embodiment is performed. That is, the second calculator 3 calculates load components at each analysis point. Each load component is obtained by calculating (the amount of change in internal energy) / (the amount of average displacement) using the amount of change in the internal energy and the average amount of displacement calculated in step S3 as described above.

  Subsequently, the display unit 21 displays the load component at each analysis point on the display or the like as a color map, for example, in the contour diagram of the member to be measured (step S11). Specifically, as shown in FIG. 13, when the member to be measured is deformed, the degree of load contribution in the member to be measured is visualized by, for example, increasing the color as the degree of load contribution in the member to be measured becomes larger. . In the illustrated example, the portions 22 and 23 of the rectangular tube member 20, which is a measured member, are displayed at the highest concentration, and are the portions with the largest load components. By looking at this contour diagram, it is possible to simply and clearly identify the place where the current load is determined for the member to be measured, and it is appropriate to take measures to improve the performance by obtaining the necessary load characteristics. Can be done.

  In the case where the display unit 21 uses a measured member constituted by a plurality of parts, for example, the load components may be averaged for each part and displayed on the contour diagram.

  As described above, according to the present embodiment, the relationship between the deformation resistance and load of each strain section which is the source of deformation resistance in the member to be measured is quantified, and it is easily achieved in a short time by a relatively simple method. It becomes possible to grasp the part to which the load of the measured member contributes.

Third Embodiment
Of each component (the collision analysis unit 1, the first calculation unit 2, the second calculation unit 3, the third calculation unit 5, etc. of FIGS. 1 and 9) of the evaluation device according to the first or second embodiment described above The function can be realized by operating a program stored in a RAM or ROM of a computer. Similarly, in each step of the evaluation method according to the first or second embodiment (steps S1 to S6 and the like in FIG. 2 and S1 to S4 and the like in FIG. 10), a program stored in the RAM or ROM of the computer is It can be realized by operating. The program and a computer readable recording medium recording the program are included in the first or second embodiment.

  Specifically, the above program is recorded on a recording medium such as a CD-ROM, for example, or provided to a computer via various transmission media. A flexible disk, a hard disk, a magnetic tape, a magneto-optical disk, a non-volatile memory card etc. can be used as a recording medium which records said program besides CD-ROM. On the other hand, as a transmission medium of the above program, a communication medium in a computer network system for propagating and supplying program information as a carrier wave can be used. Here, the computer network is a LAN, a WAN such as the Internet, a wireless communication network or the like, and the communication medium is a wired line such as an optical fiber or a wireless line.

  Further, the programs included in the present embodiment are not limited only to those in which the functions of the first or second embodiment are realized by execution of the supplied program by a computer. For example, even when the function of the first or second embodiment is realized in cooperation with an OS (Operating System) or other application software or the like in which the program is run on a computer, such a program is the present embodiment. include. In addition, even when all or part of the processing of the supplied program is performed by the function expansion board or function expansion unit of the computer and the functions of the first or second embodiment are realized, such a program is executed. Included in the form.

  In this embodiment, when performing calculation of load contribution and performance evaluation of the measured member based on FEM collision analysis of the measured member such as a hat-shaped member, for example, a subroutine program of LS-DYNA that is general-purpose collision analysis software. It is possible to link the evaluation program of the present invention as That is, LS-DYNA is used for numerical analysis of the member to be measured at the time of collision, and the evaluation program of the present invention is used for calculation of the degree of load contribution and performance evaluation of the member to be measured.

  For example, FIG. 14 is a schematic view showing an internal configuration of a personal user terminal device. In FIG. 14, reference numeral 1200 denotes a personal computer (PC) provided with a CPU 1201. The PC 1200 executes device control software stored in the ROM 1202 or the hard disk (HD) 1211 or supplied from the flexible disk drive (FD) 1212. The PC 1200 collectively controls the devices connected to the system bus 1204.

  Steps S1 to S6 in FIG. 2 of the first embodiment and steps S1 to S4 in FIG. 10 of the second embodiment are realized by the program stored in the CPU 1201 of the PC 1200, the ROM 1202 or the hard disk (HD) 1211. Be done.

  A RAM 1203 functions as a main memory, a work area, and the like of the CPU 1201. A keyboard controller (KBC) 1205 controls instruction input from a keyboard (KB) 1209 or a device (not shown).

  A CRT controller (CRTC) 1206 controls the display of a CRT display (CRT) 1210. Reference numeral 1207 denotes a disk controller (DKC). The DKC 1207 controls access to a hard disk (HD) 1211 storing a boot program, a plurality of applications, editing files, user files, a network management program and the like, and a flexible disk (FD) 1212. Here, the boot program is a boot program for starting execution (operation) of hardware and software of a personal computer.

A network interface card (NIC) 1208 exchanges data with a network printer, another network device, or another PC via the LAN 1220.
As the evaluation device according to the first or second embodiment, instead of using a personal user terminal device, a predetermined computer or the like specialized as the evaluation device may be used.

According to the present invention, the load component is calculated using the average displacement amount of the entire analysis point of the member to be measured, and by using this load component, high-precision quantitative evaluation of the member to be measured can be easily performed in a short time. The present invention can be applied to the appropriate evaluation of a framework member responsible for deformation due to a collision in a car body or the like of an automobile.

Claims (19)

A first step of calculating an amount of change in internal energy for each analysis point of the member to be measured in a predetermined time interval, and an average displacement amount of the entire analysis point;
Using the calculated change amount of the internal energy and the average displacement amount, the change amount of the internal energy for each analysis point is divided by the average displacement amount, and a load component for each analysis point of the member to be measured A second step of calculating
Evaluation method characterized by including. The first step calculates a strain amount for each of the analysis points,
The method further includes a third step of adding the load component for each strain section of the member to be measured according to the strain amount for each analysis point to calculate the degree of load contribution for each strain section. The evaluation method according to claim 1, wherein   The evaluation method according to claim 1, further comprising a fourth step of displaying the load component in the measurement target member.   The evaluation method according to claim 3, wherein the fourth step displays the load component for each analysis point as a color map.   The evaluation method according to claim 2, further comprising a fifth step of displaying the degree of load contribution calculated for each strain section.   The evaluation method according to any one of claims 1 to 5, wherein the predetermined time interval is determined based on a load displacement curve of the member to be measured.   The evaluation method according to claim 6, wherein the predetermined time interval is a time interval corresponding to the maximum load in the load displacement curve. Before the first step, collision analysis is performed on the measured member;
The said 1st step calculates the variation | change_quantity of the said internal energy for every said analysis point, the said distortion amount, and the said average displacement amount based on the result of the said collision analysis, It is characterized by the above-mentioned. Evaluation method.   The load contribution degree for each strain section is multiplied by the true stress of the member to be measured for each strain section, and the multiplication value for each strain section is added to calculate an evaluation value of the member to be measured. The evaluation method according to any one of claims 2, 5, 8 further comprising a sixth step. A first step of calculating an amount of change in internal energy for each analysis point of the member to be measured in a predetermined time interval, and an average displacement amount of the entire analysis point;
Using the calculated change amount of the internal energy and the average displacement amount, the change amount of the internal energy for each analysis point is divided by the average displacement amount, and a load component for each analysis point of the member to be measured A second step of calculating
A computer readable recording medium having a program recorded thereon for causing a computer to execute. The first step calculates a strain amount for each of the analysis points,
The program further includes a third step of adding the load component for each strain section of the member to be measured according to the strain amount for each analysis point, and calculating a load contribution degree for each strain section. The recording medium according to claim 10, which is executed by a computer.   The recording medium according to claim 10, wherein the program causes the computer to further execute a fourth step of displaying the load component of the measured member.   The recording medium according to claim 12, wherein the fourth step displays an image of the load component for each analysis point as a color map.   The recording medium according to claim 11, wherein the program causes the computer to further execute a fifth step of displaying the degree of load contribution calculated for each strain section.   The recording medium according to any one of claims 10 to 14, wherein the predetermined time interval is determined based on a load displacement curve of the member to be measured.   The recording medium according to claim 15, wherein the predetermined time interval is a time interval corresponding to the maximum load in the load displacement curve. Before the first step, collision analysis is performed on the measured member;
12. The apparatus according to claim 11, wherein the first step calculates the amount of change in the internal energy, the amount of strain, and the average amount of displacement for each of the analysis points based on the result of the collision analysis. recoding media.   The program multiplies the load contribution degree for each strain section by the true stress of the member to be measured for each strain section, adds the multiplication value for each strain section, and evaluates the member to be measured. The recording medium according to any one of claims 11, 14 and 17, further causing the computer to execute a sixth step of calculating a value. A first calculator configured to calculate an amount of change in internal energy for each analysis point of the member to be measured in a predetermined time interval, and an average displacement amount of the entire analysis point;
Using the calculated change amount of the internal energy and the average displacement amount, the change amount of the internal energy for each analysis point is divided by the average displacement amount, and a load component for each analysis point of the member to be measured A second calculation unit that calculates
An evaluation device characterized by including.