Fatigue tester and display control method of the same

Abstract

To make it easier for a user to check a test result.SOLUTION: A fatigue tester 1 is for measuring mechanical characteristics of a test piece TP by repeatedly applying a test force F to the test piece TP. On a test result list screen 800 that displays a list of test results RT of a predetermined number K (two or more) of fatigue tests, at least the numbers of repetition N are displayed in association with test result file names 801 for the predetermined number K of fatigue tests.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a fatigue testing machine and a display control method for a fatigue testing machine. [Background technology]

[0002] 2. Description of the Related Art Various techniques have been known in the past for reducing the burden on operators of fatigue testing machines. For example, Patent Document 1 discloses a management device for fatigue testing machines that displays progress information of fatigue tests corresponding to each of a plurality of fatigue testing machines. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-107416 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology described in Patent Document 1 does not reduce the effort required by the user when checking test results. Furthermore, fatigue testing often requires several days to complete, and multiple fatigue testing machines are often operated simultaneously, resulting in many users checking multiple test results at once. While it would be desirable to check these test results one by one, there is an increasing demand for users to be able to prioritize the checking of test results that show unexpected results.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a fatigue testing machine and a display control method for a fatigue testing machine that can reduce the user's effort when checking test results. [Means for solving the problem]

[0006] A fatigue testing machine according to a first aspect of the present invention is a fatigue testing machine that repeatedly applies a test force to a test specimen to measure the mechanical properties of the specimen, and is equipped with a list screen that displays a list of test results for a predetermined number of fatigue tests (two or more), and displays test results including at least the number of repetitions in association with identification information for the predetermined number of fatigue tests.

[0007] A display control method for a fatigue testing machine according to a second aspect of the present invention is a display control method for a fatigue testing machine that repeatedly applies a test force to a test specimen to measure the mechanical properties of the specimen, and includes a display step of displaying test results including at least the number of repetitions in association with identification information for a predetermined number of fatigue tests on a list screen that displays a list of test results for two or more predetermined number of fatigue tests. [Effects of the Invention]

[0008] A fatigue testing machine according to a first aspect of the present invention and a display control method for a fatigue testing machine according to a second aspect of the present invention display test results including at least the number of repetitions in association with identification information for a predetermined number of fatigue tests on a list screen that displays a list of test results for two or more predetermined number of fatigue tests. Therefore, since the test results, including at least the number of repetitions, are displayed in association with the identification information of two or more predetermined number of fatigue tests, the user can easily select the test result they want when checking the test results, thereby reducing the effort required for the user when checking the test results. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a fatigue testing machine according to the present embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of the configuration of a main body control device and a display control device. [Figure 3] FIG. 10 is a screen diagram showing an example of a test condition display screen. [Figure 4] FIG. 10 is a screen shot showing an example of a graph showing the relationship between stress and strain in one cycle of a fatigue test. [Figure 5]FIG. 10 is a screen view showing another example of a graph showing the relationship between stress and strain in one cycle of a fatigue test. [Figure 6] FIG. 10 is a screen diagram showing an example of a test result list screen. [Figure 7] FIG. 10 is a screen diagram showing an example of a first graph display screen. [Figure 8] FIG. 10 is a screen diagram showing an example of a second graph display screen. [Figure 9] 10 is a flowchart illustrating an example of processing by a display control device. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Background to the invention) Through diligent research, the inventors of the present invention have found that, among a plurality of parameters that indicate the results of a fatigue test, one of the parameters that users are most interested in is the number of repetitions (number of cycles). The user sets the number of cycles based on the material and shape of the specimen and the test conditions. However, if the fatigue test ends with fewer cycles than the user expected, it is found to be useful information indicating the occurrence of an error such as a missetting of the testing machine, or the possibility that the specimen broke under a load smaller than expected. In the former case, unnecessary error data can be removed from a large amount of test results, shortening the work time, while in the latter case, the data can be used as valid experimental data to expedite the planning of the next test. The above is an example in which the user sets the number of repetitions of the fatigue test, but it has been found that the same effect can be obtained even if the fatigue test is carried out until the specimen is destroyed.

[0011] Hereinafter, the present embodiment will be described with reference to the drawings.

[0012] [1. Configuration of fatigue testing machine] FIG. 1 is a diagram showing an example of the configuration of a fatigue testing machine 1 according to this embodiment. The fatigue testing machine 1 of this embodiment performs a fatigue test to measure the mechanical properties of a sample by repeatedly applying a test force F to a test piece TP. The test force F is a tensile force and a compressive force. The fatigue testing machine 1 comprises a testing machine main body 2 that performs fatigue testing by repeatedly applying a test force F to a test piece TP, which is the material to be tested, a control unit 3 that controls the fatigue testing operation by the testing machine main body 2, and a display control device 60. The test piece TP corresponds to an example of a "specimen."

[0013] As shown in FIG. 1, the testing machine main body 2 is configured by forming a load frame on a base 26 using a pair of support columns 28 and 29 and a yoke 13, and fixing a crosshead 10 to the support columns 28 and 29.

[0014] A hydraulic actuator 18 is disposed on the base 26, and a lower grip 22 for gripping the lower end of the test piece TP is attached to a piston rod 181 of the hydraulic actuator 18. An upper grip 21 for gripping the upper end of the test piece TP is attached to the crosshead 10 via a load cell 14.

[0015] The hydraulic actuator 18 has its piston rod 181 extended and retracted by a servo valve 20, which controls the direction and amount of pressure oil. As a result, the gap between the upper grip 21 and the lower grip 22 expands and contracts, and a test force F is applied to the test piece TP fixed between the upper grip 21 and the lower grip 22. The stroke of the hydraulic actuator 18, i.e., the displacement of the test piece TP, is detected by a differential transformer 19 attached to the hydraulic actuator 18.

[0016] The load cell 14 is a sensor that measures the test force F, which is the tensile load applied to the test piece TP, and outputs a test force measurement signal SG1 to the control unit 3. The differential transformer 19 is a sensor that measures the displacement amount of the test piece TP and outputs a displacement measurement signal SG2 corresponding to the displacement amount to the control unit 3.

[0017] The control unit 3 includes a signal input / output device 40 and a main body control device 50. The signal input / output device 40 constitutes an input / output interface circuit for transmitting and receiving signals to and from the testing machine main body 2, and in this embodiment has a first sensor amplifier 42, a second sensor amplifier 43, and a servo amplifier 44. The first sensor amplifier 42 is an amplifier that amplifies the test force measurement signal SG1 output by the load cell 14 to generate a test force detection value FD, and outputs the test force detection value FD to the main body control device 50.

[0018] When the initial cross-sectional area of ​​the test piece TP (the cross-sectional area in the horizontal direction in FIG. 1) is described as the cross-sectional area S, the stress σ applied to the test piece TP can be calculated by the following formula (1). σ=FD / S (1) Furthermore, when the maximum value of stress σ in one cycle of the fatigue test is described as maximum stress σM and the minimum value of stress σ in one cycle of the fatigue test is described as minimum stress σN, the stress amplitude σW can be calculated using the following equation (2). σW=(σM-σN) / 2 (2)

[0019] The second sensor amplifier 43 amplifies the displacement measurement signal SG2 output by the differential transformer 19 and outputs a displacement measurement signal A3 indicating the displacement detection value XD to the main body control device 50 as a digital signal. The servo amplifier 44 is a device that controls the servo valve 20 under the control of the main body control device 50. The main body control device 50 calculates a command value dX of the displacement detection value XD and transmits a command signal A4 indicating the command value dX to the servo valve 20.

[0020] When the initial length of the test piece TP (the length in the vertical direction in FIG. 1) is described as length L, if the displacement detection value XD when the test piece TP has length L is set to "zero," the strain ED can be calculated by the following equation (3). ED = (XD / L) × 100 (3) Furthermore, when the maximum value of the strain ED in one cycle of the fatigue test is referred to as the maximum strain EDM and the minimum value of the strain ED in one cycle of the fatigue test is referred to as the minimum strain EDN, the strain amplitude EW can be calculated using the following equation (4). EW=(EDM-EDN) / 2 (4)

[0021] Based on operations from the user, the main body control device 50 controls the operation of the testing machine main body 2. Furthermore, the main body control device 50 causes the testing machine main body 2 to execute a fatigue test. In this embodiment, the “user” includes an operator who operates the testing machine main body 2 .

[0022] The main body control device 50 includes a computer having a storage device such as a hard disk drive (HDD) or a solid state drive (SSD), an interface circuit with the signal input / output device 40, and various electronic circuits. An A / D converter is provided in the interface circuit with the signal input / output device 40, and the analog test force measurement signal SG1 and displacement measurement signal SG2 are converted into digital signals by the A / D converter.

[0023] The display control device 60 is communicably connected to the main body control device 50 and displays various information. The display control device 60 also includes a display mechanism 65, and causes the display mechanism 65 to display various images.

[0024] [2. Configuration of the main control device] Next, the configurations of the main body control device 50 and the display control device 60 will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the configurations of the main body control device 50 and the display control device 60 according to this embodiment. The main body control device 50 is configured, for example, by a personal computer. The main body control device 50 includes a first control unit 51, a first communication interface 53, and a first operation mechanism 54. The first control unit 51 also includes a first processor 51A and a first memory 51B. The first processor 51A is configured with a CPU (Central Processing Unit), an MPU (Micro-Processing Unit), and the like. The first memory 51B is configured with a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The first memory 51B stores a first control program 514.

[0025] The first communication interface 53 is a communication interface that communicates with the display control device 60 in accordance with, for example, the USB (Universal Serial Bus) standard. The first communication interface 53 includes a connector for connecting a USB cable and an interface circuit for processing signals transmitted through the connector. The first communication interface 53 is an interface board having a connector and an interface circuit, and is connected to a main board on which the first processor 51A and the like of the main body control device 50 are mounted. Alternatively, the connector and interface circuit that constitute the first communication interface 53 are mounted on the main board of the first processor 51A. The first communication interface 53 transmits various information to the display control device 60.

[0026] The first operation mechanism 54 includes various buttons, keys, etc., and receives operations from the user. The first operation mechanism 54 also generates an operation signal corresponding to the received operation and outputs the generated operation signal to the first processor 51A.

[0027] The main body control device 50 is not limited to a personal computer, and may be configured with one or more appropriate circuits such as integrated circuits such as IC chips and LSIs. The main body control device 50 may also be configured with, for example, a tablet terminal or a smartphone. The main body control device 50 may also include programmed hardware such as a DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), etc. The main body control device 50 may also include a SoC (System-on-a-Chip)-FPGA.

[0028] As shown in FIG. 2, the first control unit 51 includes a test execution unit 511, a first acquisition unit 512, a first communication control unit 513, and a test condition storage unit 515. Specifically, the first processor 51A executes the first control program 514 stored in the first memory 51B, thereby functioning as a test execution unit 511, a first acquisition unit 512, and a first communication control unit 513. Furthermore, the first processor 51A executes the first control program 514 stored in the first memory 51B, thereby causing the first memory 51B to function as a test condition storage unit 515.

[0029] The test condition storage unit 515 stores test conditions CT for the fatigue test to be executed by the testing machine main body 2. In this embodiment, a case where the test conditions CT are stored in advance in the test condition storage unit 515 will be described. Test condition CT will be further explained with reference to FIG.

[0030] The test execution unit 511 reads out the test conditions CT from the test condition storage unit 515, and causes the testing machine main body 2 to execute a fatigue test in accordance with the read out test conditions CT. The test execution unit 511 controls the testing machine main body 2 so that the stress amplitude σW or the strain amplitude EW becomes a predetermined value defined by the test condition CT. For example, the test execution unit 511 controls the hydraulic actuator 18 based on the test force detection value FD so that the stress amplitude σW becomes a predetermined value defined by the test condition CT. The test execution unit 511 calculates the stress amplitude σW from the test force detection value FD using the above formulas (1) and (2). Furthermore, for example, the test execution unit 511 controls the hydraulic actuator 18 based on the displacement detection value XD so that the strain amplitude EW becomes a predetermined value defined by the test conditions CT. Note that the test execution unit 511 calculates the strain amplitude EW from the displacement detection value XD using the above equations (3) and (4).

[0031] When the test execution unit 511 has applied to the test piece TP a test force F corresponding to the number of repetitions N specified in the test conditions CT, the test execution unit 511 terminates the execution of the fatigue test by the testing machine main body 2. The number of repetitions N is the number of times the test force F is repeatedly applied. In addition, the test execution unit 511 terminates the execution of the fatigue test by the testing machine main body 2 if the test piece TP breaks during the period in which the test force F corresponding to the number of repetitions N specified in the test conditions CT is applied to the test piece TP. In addition, the test execution unit 511 terminates the execution of the fatigue test by the testing machine main body 2 when it receives an operation from the user to terminate the fatigue test during the period in which the test force F corresponding to the number of repetitions N specified in the test conditions CT is being applied to the test piece TP. Furthermore, when the test execution unit 511 receives a preset alarm from the testing machine main body 2, it causes the testing machine main body 2 to terminate the execution of the fatigue test.

[0032] The first acquisition unit 512 acquires the test force detection value FD and the displacement detection value XD while the testing machine main body 2 is performing a fatigue test. The first acquisition unit 512 acquires the test force detection value FD output from the load cell 14 via the first sensor amplifier 42. The first acquisition unit 512 also acquires the displacement detection value XD output from the differential transformer 19 via the servo amplifier 44.

[0033] The first communication control unit 513 causes the first communication interface 53 to communicate with the display control device 60. For example, when the test execution unit 511 causes the testing machine main body 2 to start executing a fatigue test, the first communication control unit 513 transmits test start information JS and test conditions CT to the display control device 60. For example, while the testing machine main body 2 is executing a fatigue test, the first communication control unit 513 transmits the test force detection value FD, the displacement detection value XD, the stress amplitude σW, and the strain amplitude EW to the display control device 60. In addition, for example, when the test execution unit 511 causes the testing machine main body 2 to end the execution of the fatigue test, the first communication control unit 513 transmits test end information JE to the display control device 60.

[0034] [3. Configuration of display control device] Next, the configuration of the display control device 60 will be described with reference to FIG. The display control device 60 is configured by, for example, a personal computer. The display control device 60 includes a second control unit 61, a second communication interface 63, a second operation mechanism 64, and a display mechanism 65. The second control unit 61 includes a second processor 61A and a second memory 61B. The second processor 61A is composed of a CPU, an MPU, and the like. The second memory 61B is configured with a ROM, a RAM, etc. The second memory 61B stores a second control program 615.

[0035] In this embodiment, the display control device 60 is configured as a personal computer, but is not limited to this. The display control device 60 may be configured as, for example, a tablet terminal, a smartphone, or the like.

[0036] The second communication interface 63 is a communication interface that communicates with the main body control device 50 in accordance with, for example, the USB standard. The second communication interface 63 includes a connector for connecting a USB cable and an interface circuit for processing signals transmitted through the connector. The second communication interface 63 is an interface board having a connector and an interface circuit, and is connected to a main board on which the second processor 61A of the display control device 60 is mounted. Alternatively, the connector and interface circuit that constitute the second communication interface 63 are mounted on the main board of the second processor 61A. The second communication interface 63 receives various information from the main body control device 50.

[0037] In this embodiment, the main body control device 50 and the display control device 60 communicate in accordance with the USB standard, but the present invention is not limited to this. For example, the main body control device 50 and the display control device 60 may communicate in accordance with a standard such as Ethernet (registered trademark). Furthermore, for example, the main body control device 50 and the display control device 60 may communicate wirelessly in accordance with a standard such as Bluetooth (registered trademark).

[0038] The second operation mechanism 64 includes various buttons, keys, etc., and receives operations from the user. The second operation mechanism 64 also generates an operation signal corresponding to the received operation and outputs the generated operation signal to the second processor 61A. The second operation mechanism 64 includes, for example, a keyboard and a mouse. The second operation mechanism 64 receives, for example, an operation on the test result list screen 800 from the user. The test results list screen 800 will be further described with reference to FIG.

[0039] The display mechanism 65 includes an LCD (Liquid Crystal Display) or the like, and displays various images on the LCD. For example, the display mechanism 65 displays a test result list screen 800, a first graph display screen 810, and a second graph display screen 820 on the LCD in accordance with instructions from the display control unit 613. The first graph display screen 810 is further described with reference to FIG. The second graph display screen 820 is further described with reference to FIG.

[0040] The second control unit 61 includes a second acquisition unit 611 , a generation unit 612 , a display control unit 613 , a second communication control unit 614 , and a test result storage unit 616 . Specifically, the second processor 61A executes the second control program 615 stored in the second memory 61B, thereby functioning as a second acquisition unit 611, a generation unit 612, a display control unit 613, and a second communication control unit 614. In addition, the second processor 61A executes the second control program 615 stored in the second memory 61B, thereby causing the second memory 61B to function as a test result storage unit 616.

[0041] The test result storage unit 616 stores test results RT of a predetermined number K of fatigue tests, which is two or more. The predetermined number K is, for example, 10. The test results RT include, for example, test conditions CT, a test force detection value FD, a displacement detection value XD, a stress amplitude σW, and a strain amplitude EW. The test result storage unit 616 stores, for example, the test condition CT acquired by the second acquisition unit 611. The test result storage unit 616 also stores, for example, the test force detection value FD and the displacement detection value XD acquired by the second acquisition unit 611 in association with the test condition CT. The test result storage unit 616 also stores, for example, the stress amplitude σW and the strain amplitude EW acquired by the second acquisition unit 611 in association with the test condition CT.

[0042] For example, when the test execution unit 511 causes the testing machine main body 2 to start executing a fatigue test, the second acquisition unit 611 acquires test start information JS and test conditions CT from the main body control device 50. In addition, the second acquisition unit 611 stores the test conditions CT in the test result storage unit 616. Furthermore, for example, while the testing machine main body 2 is performing a fatigue test, the second acquisition unit 611 acquires the test force detection value FD, the displacement detection value XD, the stress amplitude σW, and the strain amplitude EW from the main body control device 50. Furthermore, the second acquisition unit 611 stores the test force detection value FD, the displacement detection value XD, the stress amplitude σW, and the strain amplitude EW in the test result storage unit 616. Furthermore, the second acquisition unit 611 acquires test end information JE from the main body control device 50, for example, when the test execution unit 511 causes the testing machine main body 2 to end the execution of a fatigue test. Then, when the second acquisition unit 611 acquires the test end information JE, the second acquisition unit 611 associates the test conditions CT with the test force detection value FD, the displacement detection value XD, the stress amplitude σW, and the strain amplitude EW, and stores them as a single file in the test result storage unit 616. The second acquisition unit 611 assigns identification information as a file name, and stores them as a single file in the test result storage unit 616.

[0043] The generation unit 612 generates a first graph GR1 when the user selects multiple fatigue test results RT from the test results of a predetermined number K of fatigue tests. The first graph GR1 is a graph showing the relationship between the stress amplitude σW and the number of repetitions N for the multiple fatigue test results RT. Furthermore, the generating unit 612 generates a second graph GR2 when the user selects multiple fatigue test results RT from the test results of a predetermined number K of fatigue tests. The second graph GR2 is a graph showing the relationship between the strain amplitude EW and the number of repetitions N in the test results of the multiple fatigue tests.

[0044] The display control unit 613 displays various images on the display mechanism 65. For example, the display control unit 613 displays, on the LCD of the display mechanism 65, a test condition display screen 700, a test result list screen 800, a first graph display screen 810, and a second graph display screen 820, for example. The test condition display screen 700 will be further described with reference to FIG. The test results list screen 800 will be further described with reference to FIG. The first graph display screen 810 is further described with reference to FIG. The second graph display screen 820 is further described with reference to FIG.

[0045] The second communication control unit 614 causes the second communication interface 63 to communicate with the main body control device 50. For example, when the test execution unit 511 causes the testing machine main body 2 to start executing a fatigue test, the second communication control unit 614 receives test start information JS and test conditions CT from the main body control device 50. For example, while the testing machine main body 2 is executing a fatigue test, the second communication control unit 614 receives the test force detection value FD, the displacement detection value XD, the stress amplitude σW, and the strain amplitude EW from the main body control device 50. For example, when the test execution unit 511 causes the testing machine main body 2 to end executing the fatigue test, the second communication control unit 614 receives test end information JE from the main body control device 50.

[0046] [4.Display screen] Next, the screens displayed on the LCD by the display control unit 613 will be described with reference to Figures 3 to 8. Figure 3 is a screen diagram showing an example of a test condition display screen 700. The test condition display screen 700 is displayed on the LCD of the display mechanism 65 by the display control unit 613, for example. The test condition display screen 700 displays a waveform display section 701, a control mode display section 702, a waveform image display section 703, a maximum value display section 704, a minimum value display section 705, a frequency display section 706, and a repetition count display section 707.

[0047] The waveform display section 701 displays a waveform that changes the stress amplitude σW or strain amplitude EW of the controlled object. The controlled object is an object controlled by the test execution section 511 of the main body control device 50. The waveform includes a triangular wave and a sine wave. The waveform display section 701 displays "triangular wave," indicating that the controlled object (here, strain ED) is changed by a triangular wave.

[0048] The control mode display unit 702 displays the control mode. The control mode specifies the object to be controlled by the test execution unit 511 of the main body control device 50, i.e., the control object. The control object is, for example, stress σ or strain ED. Stress σ is specified by the above equation (1), and strain ED is specified by the above equation (3). The control mode display unit 702 displays "strain," indicating that the control object is strain ED.

[0049] The waveform image display section 703 displays in a graph the waveform of the control object specified in the waveform display section 701 and the control mode display section 702. Since the waveform display section 701 specifies that the control object (here, the distortion ED) is to be changed with a triangular wave, the waveform image display section 703 displays one cycle of a triangular wave.

[0050] The maximum value display section 704 displays the maximum value of the graph displayed in the waveform image display section 703. The maximum value display section 704 displays "0.1%", indicating that the maximum value of the triangular wave of the control target (here, distortion ED) is "0.1%". The minimum value display section 705 displays the minimum value of the graph displayed in the waveform image display section 703. The minimum value display section 705 displays "-0.1%", indicating that the minimum value of the triangular wave of the control target (here, distortion ED) is "-0.1%". In other words, the maximum value display section 704 and the minimum value display section 705 indicate that the distortion amplitude EW is "0.1%." In this embodiment, a positive value of the strain ED indicates that the test piece TP is elongated from the initial length L. A negative value of the strain ED indicates that the test piece TP is compressed from the initial length L.

[0051] The frequency display unit 706 displays the frequency of the object (here, the distortion ED) controlled by the test execution unit 511 of the main body control device 50. The frequency display unit 706 displays 0.25 Hz, which indicates that the test execution unit 511 of the main body control device 50 controls the object (here, the distortion ED) so that one period becomes 4 seconds.

[0052] The repetition count display section 707 displays the value of the number of repetitions N of the fatigue test executed by the test execution section 511 of the main body control device 50. The repetition count display section 707 displays "5000", indicating that the number of repetitions N is 5000.

[0053] Fig. 4 is a screen image 710 showing an example of a graph showing the relationship between stress σ and strain ED in one cycle of a fatigue test. Screen image 710 displays a graph image 711 showing the relationship between stress σ and strain ED in one cycle of a fatigue test defined by the test condition display screen 700 shown in Fig. 3. Note that the display control unit 613 causes, for example, the LCD of the display mechanism 65 to display the graph image 711 shown in screen image 710 while the fatigue test defined by the test condition display screen 700 shown in Fig. 3 is being performed. In the graph 711, the left vertical axis indicates stress σ (MPa), the right vertical axis indicates strain ED (%), and the horizontal axis indicates time (sec).

[0054] Graph G11 in graph diagram 711 shows an example of changes in distortion ED. As shown in graph G11, distortion ED is controlled by test execution unit 511 of main body control device 50 so that the maximum value is "0.1%", the minimum value is "-0.1%, and one cycle is a triangular wave of 4 seconds.

[0055] Graph G12 in graph diagram 711 shows an example of the change in stress σ. As shown in graph G12, when strain ED is increased at a constant rate, stress σ draws an upward convex curve, and when strain ED is decreased at a constant rate, stress σ draws a downward convex curve.

[0056] 5 is a screen image 720 showing another example of a graph showing the relationship between stress σ and strain ED in one cycle of a fatigue test. Screen image 720 displays a graph image 721 showing the relationship between stress σ and strain ED in one cycle of a fatigue test defined by the test condition display screen 700 shown in FIG. 3. Note that the display control unit 613 causes, for example, the LCD of the display mechanism 65 to display the graph image 721 shown in screen image 720 while the fatigue test defined by the test condition display screen 700 shown in FIG. 3 is being performed. In the graph 721, the vertical axis indicates stress σ (MPa), and the horizontal axis indicates strain ED (%).

[0057] Graph G2 shown in graph diagram 721 shows the relationship between stress σ and strain ED in one cycle of the fatigue test defined on test condition display screen 700 shown in Fig. 3. As shown in graph G2, strain ED is controlled by test execution unit 511 of main body control device 50 so that the maximum value is "0.1%" and the minimum value is "-0.1%".

[0058] As shown in graph G2, when the strain ED is increased at a constant rate, the stress σ draws an upward convex curve, and when the strain ED is decreased at a constant rate, the stress σ draws a downward convex curve.

[0059] 6 is a screen diagram showing an example of a test result list screen 800. The test result list screen 800 displays a list of test results RT of a predetermined number K of fatigue tests. The test result list screen 800 displays a list of test results RT of 10 fatigue tests. In other words, in FIG. 6, the predetermined number K is 10. The test result list screen 800 displays, from left to right, a test result file name 801, test date and time 802, stress amplitude 803, strain amplitude 804, number of repetitions 805, an open button 806, and a cancel button 807. The test result list screen 800 corresponds to an example of a "list screen."

[0060] The test result file name 801 is given to each of the test results RT stored in the test result storage unit 616 when the test end information JE is acquired by the second acquisition unit 611 of the display control device 60. The test result file name 801 indicates the file name given to each of the test results RT stored in the test result storage unit 616.

[0061] The test date and time 802 indicates, for example, the test end date and time. The test date and time 802 is, for example, the date and time when the test execution unit 511 of the main body control device 50 ended the execution of the fatigue test by the testing machine main body 2. The test end date and time is, for example, included in the test end information JE.

[0062] In the test conditions CT corresponding to the test result RT, when the stress σ is set as a control target of the test execution unit 511 of the main body control device 50, the stress amplitude 803 indicates the value of the stress amplitude σW specified in the test conditions CT. In other words, when the stress σ is set as a control target of the test execution unit 511 of the main body control device 50, it is when it is specified as "stress" in the control mode display unit 702 shown in FIG.

[0063] In the test conditions CT corresponding to the test result RT, when the strain ED is set as the control target of the test execution unit 511 of the main body control device 50, the stress amplitude 803 is, for example, the average value of the measured values ​​of the stress amplitude σW. In other words, when the strain ED is set as the control target of the test execution unit 511 of the main body control device 50, it is when it is specified as "strain" in the control mode display unit 702 shown in FIG. 3. The average value of the measured values ​​of the stress amplitude σW is the average value of the measured values ​​of the stress amplitude σW in the fatigue test executed by the test execution unit 511. The measured value of the stress amplitude σW is calculated from the detected displacement value XD using the above equations (1) and (2).

[0064] In the test conditions CT corresponding to the test result RT, when the strain ED is set as a control target of the test execution unit 511 of the main body control device 50, the strain amplitude 804 indicates the value of the strain amplitude EW specified in the test conditions CT. In other words, when the strain ED is set as a control target of the test execution unit 511 of the main body control device 50, it is specified as "distortion" in the control mode display unit 702 shown in FIG.

[0065] In the test conditions CT corresponding to the test result RT, when the stress σ is set as a control target of the test execution unit 511 of the main body control device 50, the strain amplitude 804 is, for example, the average value of the measured values ​​of the strain amplitude EW. In other words, when the stress σ is set as a control target of the test execution unit 511 of the main body control device 50, it is when it is specified as "stress" in the control mode display unit 702 shown in FIG. 3. The average value of the measured values ​​of the strain amplitude EW is the average value of the measured values ​​of the strain amplitude EW in the fatigue test executed by the test execution unit 511. The measured value of the strain amplitude EW is calculated from the test force detection value FD using the above equations (3) and (4).

[0066] The number of repetitions 805 is the number of repetitions when the test execution unit 511 ends the execution of the fatigue test by the testing machine main body 2. For example, when the test execution unit 511 applies a test force F corresponding to the number of repetitions N specified in the test conditions CT to the test piece TP, the number of repetitions 805 matches the number of repetitions N specified in the test conditions CT. For example, if the test piece TP breaks during the period in which the test force F corresponding to the number of repetitions N specified in the test conditions CT is applied to the test piece TP, the number of repetitions 805 is the number of repetitions at which the test piece TP breaks. For example, if an operation to terminate the fatigue test is received from the user during the period in which a test force F corresponding to the number of repetitions N specified in the test conditions CT is being applied to the test piece TP, the number of repetitions 805 is the number of repetitions at the time the operation to terminate the fatigue test is received from the user. For example, when the test execution unit 511 receives a preset alarm from the tester main body 2, the number of repetitions 805 is the number of repetitions when the alarm is received.

[0067] The user operates the second operating mechanism 64 to select a plurality of test results RT of fatigue tests from among the test results RT of the predetermined number K of fatigue tests displayed on the test result list screen 800. In Figure 6, for example, the four test result RTs from the first to fourth from the top and the four test result RTs from the sixth to ninth from the top are selected, as shown by the shading. The shading indicates that they have been selected by the user.

[0068] The open button 806 is clicked by the user when displaying the first graph GR1 or the second graph GR2. The first graph GR1 is a graph showing the relationship between the stress amplitude σW and the number of repetitions N in the test results RT of multiple fatigue tests. The second graph GR2 is a graph showing the relationship between the strain amplitude EW and the number of repetitions N in the test results of multiple fatigue tests. When the user clicks the open button 806, a screen (not shown) is displayed, which allows the user to select whether to display the first graph GR1 or the second graph GR2. The user uses this screen to select whether to display the first graph GR1 or the second graph GR2. When it is selected to display the first graph GR1, the display control unit 613 displays a first graph display screen 810 shown in Fig. 7 on the LCD of the display mechanism 65. When it is selected to display the second graph GR2, the display control unit 613 displays a second graph display screen 820 shown in Fig. 8 on the LCD of the display mechanism 65.

[0069] The cancel button 807 is clicked by the user when the user wishes to cancel the selection of test result RTs. When the cancel button 807 is clicked, the shading displayed on the four test result RTs, the first through fourth from the top, and the four test result RTs, the sixth through ninth from the top, are erased. The selection of test result RTs by the user is then canceled.

[0070] 7 is a screen diagram showing an example of a first graph display screen 810. A first graph 811 is displayed on the first graph display screen 810. The first graph 811 corresponds to an example of the first graph GR1. In first graph 811, the vertical axis represents stress amplitude σW (MPa), and the horizontal axis represents the number of repetitions N (times). The horizontal axis is a logarithmic axis. In other words, first graph 811 is a so-called semi-logarithmic graph.

[0071] Graph G3 in first graph 811 shows the relationship between stress amplitude σW and the number of repetitions N. As shown in graph G3, the greater the number of repetitions N, the more the stress amplitude σW decreases. The circles shown in the first graph 811 correspond to the stress amplitude σW and the number of repetitions N for each of the test results RT of the multiple fatigue tests. As shown in the first graph 811, the circles corresponding to each of the test results RT of the multiple fatigue tests are arranged along the graph G3, so it is estimated that the test results RT of the multiple fatigue tests do not include any abnormal test results.

[0072] 8 is a screen diagram showing an example of a second graph display screen 820. A second graph 821 is displayed on the second graph display screen 820. The second graph 821 corresponds to an example of the second graph GR2. In second graph 821, the vertical axis represents strain amplitude EW (%), and the horizontal axis represents the number of repetitions N (times). The horizontal axis is a logarithmic axis. In other words, second graph 821 is a so-called semi-logarithmic graph.

[0073] Graph G4 in second graph 821 shows the relationship between distortion amplitude EW and the number of repetitions N. As shown in graph G4, the distortion amplitude EW decreases as the number of repetitions N increases. The circles shown in the second graph 821 correspond to the strain amplitude EW and the number of repetitions N for each of the test results RT of the multiple fatigue tests. As shown in the second graph 821, the circles corresponding to each of the test results RT of the multiple fatigue tests are arranged along the graph G4, so it is estimated that the test results RT of the multiple fatigue tests do not include any abnormal test results.

[0074] [5. Display Control Device Processing] Next, the processing executed by the display control device 60 will be described with reference to FIG. FIG. 9 is a flowchart showing an example of processing by the display control device 60. As shown in FIG. 9, first, in step S101, the display control unit 613 causes the LCD of the display mechanism 65 to display the test result list screen 800 shown in FIG.

[0075] Next, in step S103, the second control unit 61 accepts a user operation to select multiple fatigue test results RT from the test results of the predetermined number K of fatigue tests. The display control unit 613 applies, for example, shading to the multiple fatigue test results RT selected by the user. The shading indicates that the test results have been selected by the user. Next, in step S105, the second control unit 61 accepts a click operation on the Open button 806 displayed on the test result list screen 800 shown in FIG. 6, and the generation unit 612 extracts the stress amplitude σW and the number of repetitions N in the test results RT of the multiple fatigue tests. Next, in step S107, the generating unit 612 generates a first graph GR1. The first graph GR1 is a graph showing the relationship between the stress amplitude σW and the number of repetitions N in the test results RT of a plurality of fatigue tests.

[0076] Next, in step S109, the generating unit 612 extracts the strain amplitude EW and the number of repetitions N from the test results of a plurality of fatigue tests. Next, in step S111, the generating unit 612 generates a second graph GR2. The second graph GR2 is a graph showing the relationship between the strain amplitude EW and the number of repetitions N in the test results RT of a plurality of fatigue tests. Next, in step S113, the second control unit 61 determines whether or not an instruction to display the first graph GR1 has been received from the user. If the second control unit 61 determines that an instruction to display the first graph GR1 has been received from the user (step S113; YES), the process proceeds to step S115. Then, in step S115, the display control unit 613 causes the first graph GR1 to be displayed on the LCD of the display mechanism 65. Thereafter, the process ends.

[0077] If the second control unit 61 determines that an instruction to display the first graph GR1 has not been received from the user (step S113; NO), the process proceeds to step S117. Then, in step S117, the second control unit 61 determines whether or not an instruction to display the second graph GR2 has been received from the user. If the second control unit 61 determines that an instruction to display the second graph GR2 has not been received from the user (step S117; NO), the process returns to step S113. If the second control unit 61 determines that an instruction to display the second graph GR2 has been received from the user (step S117; YES), the process proceeds to step S119. Then, in step S119, the display control unit 613 causes the second graph GR2 to be displayed on the LCD of the display mechanism 65. Thereafter, the process ends.

[0078] Step S101 corresponds to an example of a "display step."

[0079] [6. Aspects and Effects] It will be understood by those skilled in the art that the above-described embodiment is a specific example of the following aspects.

[0080] (Section 1) The fatigue testing machine of this embodiment is a fatigue testing machine that repeatedly applies a test force to a test specimen to measure the mechanical properties of the test specimen, and on a list screen that displays a list of test results for a predetermined number of fatigue tests (two or more), the test results, including at least the number of repetitions, are displayed in correspondence with the identification information of the predetermined number of fatigue tests.

[0081] According to the fatigue testing machine described in paragraph 1, on a list screen that displays the test results of a predetermined number of fatigue tests (two or more), the test results, including at least the number of repetitions, are displayed in association with the identification information of the predetermined number of fatigue tests. Therefore, the user can easily select the test result that the user desires from among the test results of a predetermined number of fatigue tests by referring to the number of repetitions, thereby improving user convenience.

[0082] (Section 2) In the fatigue testing machine described in paragraph 1, the list screen displays stress amplitudes as the test results in association with the identification information of the predetermined number of fatigue tests.

[0083] According to the fatigue testing machine described in paragraph 2, the stress amplitude is displayed as the test result on the list screen in association with the identification information of the predetermined number of fatigue tests. Therefore, the user can easily select the test result that the user desires from among the test results of a predetermined number of fatigue tests by referring to the number of repetitions and the stress amplitude, thereby improving user convenience.

[0084] (Section 3) In the fatigue testing machine described in paragraph 2, when a user selects multiple fatigue test results from the predetermined number of fatigue test results on the list screen, a graph showing the relationship between the stress amplitude and the number of repetitions in the multiple fatigue test results is displayed.

[0085] According to the fatigue testing machine described in paragraph 3, when a user selects multiple fatigue test results from the predetermined number of fatigue test results on the list screen, a graph showing the relationship between the stress amplitude and the number of repetitions in the multiple fatigue test results is displayed. Therefore, the user can check whether each of the multiple fatigue tests was performed normally based on the graph showing the relationship between the stress amplitude and the number of repetitions in the test results of the multiple fatigue tests, thereby improving user convenience.

[0086] (Section 4) In the fatigue testing machine according to any one of paragraphs 1 to 3, strain amplitudes are displayed as the test results on the list screen in association with the identification information of the predetermined number of fatigue tests.

[0087] According to the fatigue testing machine described in item 4, the strain amplitude is displayed as the test result on the list screen in association with the identification information of the predetermined number of fatigue tests. Therefore, the user can easily select the test result that the user desires from among the test results of a predetermined number of fatigue tests by referring to the number of repetitions and the strain amplitude, thereby improving user convenience.

[0088] (Section 5) In the fatigue testing machine described in paragraph 4, when a user selects multiple fatigue test results from the predetermined number of fatigue test results on the list screen, a graph showing the relationship between the strain amplitude and the number of repetitions in the multiple fatigue test results is displayed.

[0089] According to the fatigue testing machine described in paragraph 5, when a user selects multiple fatigue test results from the predetermined number of fatigue test results on the list screen, a graph showing the relationship between the strain amplitude and the number of repetitions in the multiple fatigue test results is displayed. Therefore, the user can check whether each of the multiple fatigue tests was performed normally based on the graph showing the relationship between strain amplitude and the number of repetitions in the test results of the multiple fatigue tests, thereby improving user convenience.

[0090] (Section 6) In a fatigue testing machine described in any one of paragraphs 1 to 5, for each of the predetermined number of fatigue tests, the test conditions for the predetermined number of fatigue tests include a stress or strain waveform in one cycle of the fatigue test, and the waveform includes at least one of a triangular wave and a sine wave.

[0091] According to the fatigue testing machine described in paragraph 6, for each of the predetermined number of fatigue tests, the test conditions for the predetermined number of fatigue tests include a stress or strain waveform in one cycle of the fatigue test, and the waveform includes at least one of a triangular wave and a sine wave. Therefore, the user can select either a triangular wave or a sine wave as the waveform of the stress or strain in one cycle of the fatigue test, thereby improving user convenience.

[0092] (Section 7) In the fatigue testing machine described in item 6, a graph showing the relationship between strain and stress in one cycle of the fatigue test is displayed while each of the predetermined number of fatigue tests is being performed.

[0093] According to the fatigue testing machine described in item 7, a graph showing the relationship between strain and stress in one cycle of the fatigue test is displayed while each of a predetermined number of fatigue tests is being performed. Therefore, since a graph showing the relationship between strain and stress in one cycle of a fatigue test is displayed while each of a predetermined number of fatigue tests is being performed, the user can check whether the fatigue test is being performed normally, thereby improving user convenience.

[0094] (Section 8) The display control method for a fatigue testing machine according to this embodiment is a display control method for a fatigue testing machine that repeatedly applies a test force to a test specimen to measure the mechanical properties of the specimen, and includes a display step of displaying test results including at least the number of repetitions in association with identification information for a predetermined number of fatigue tests on a list screen that displays a list of test results for two or more predetermined number of fatigue tests.

[0095] According to the display control method for a fatigue testing machine described in paragraph 8, the same effects as those of the fatigue testing machine described in paragraph 1 are achieved.

[0096] [7. Other embodiments] The fatigue testing machine 1 according to this embodiment is merely an example of an embodiment of the fatigue testing machine according to the present invention, and can be modified and applied as desired within the scope of the present invention.

[0097] For example, in this embodiment, a case where the fatigue testing machine is a fatigue testing machine 1 will be described, but the present invention is not limited to this. The fatigue testing machine may apply a test force to a test piece TP and deform the test piece TP to perform a material test. For example, the fatigue testing machine may be a fatigue bending testing machine or a fatigue torsion testing machine.

[0098] In this embodiment, a case has been described in which the fatigue testing machine 1 has the main body control device 50 and the display control device 60 as separate entities, but this is not limited to this; for example, the main body control device 50 and the display control device 60 may be configured as an integrated unit.

[0099] In the present embodiment, the display control device 60 includes the second acquisition unit 611, the generation unit 612, the display control unit 613, the second communication control unit 614, and the test result storage unit 616. However, the present invention is not limited to this. For example, the main body control device 50 may include at least one of the second acquisition unit 611, the generation unit 612, the display control unit 613, and the second communication control unit 614.

[0100] In addition, in the present embodiment, the case where the display control device 60 includes the display mechanism 65 has been described, but the present invention is not limited to this. For example, the display mechanism 65 may be configured as a separate entity from the display control device 60 and configured to be able to communicate with the display control device 60.

[0101] 2 indicates a functional configuration, and the specific implementation form is not particularly limited. In other words, it is not necessary to implement hardware corresponding to each functional unit individually, and it is of course possible to implement a configuration in which a single processor executes a program to realize the functions of multiple functional units. Furthermore, some of the functions realized by software in the above embodiments may be realized by hardware, or some of the functions realized by hardware may be realized by software.

[0102] 9 are divided according to the main processing content in order to facilitate understanding of the processing of the display control device 60. There is no limitation to the manner in which the processing units are divided or the names thereof shown in the flowchart of FIG. 9, and the processing units can be divided into more processing units according to the processing content, or one processing unit can be divided to include more processes. Furthermore, the processing order of the above flowchart is not limited to the example shown in the drawing.

[0103] 2, in this embodiment, the second processor 61A included in the display control device 60 executes the second control program 615 stored in the second memory 61B. This second control program 615 can also be recorded on a computer-readable recording medium. The recording medium can be a magnetic or optical recording medium or a semiconductor memory device. Specifically, examples include portable or fixed recording media such as flexible disks, HDDs, CD-ROMs (Compact Disk Read Only Memory), DVDs, Blu-ray (registered trademark) Discs, magneto-optical disks, flash memories, and card-type recording media. The recording medium may also be a non-volatile storage device such as a RAM, a ROM, or a HDD that is an internal storage device provided in the display control device 60. The second control program 615 may also be stored in a server device or the like, and the second control program 615 may be downloaded from the server device to the display control device 60. [Explanation of symbols]

[0104] 1. Fatigue testing machine 2 Testing machine body 50 Main control device 60 Display control device 61 Second Control Section 61A Second Processor 61B Second Memory 611 Second Acquisition Department 612 Generation part 613 Display control unit 614 Second communication control unit 615 Second Control Program 616 Test result memory unit 65 Display mechanism 700 Test condition display screen 800 Test result list screen 801 Test result file name 803, σW stress amplitude 804, EW strain amplitude 805, N number of repetitions 811, GR1 1st graph 821, GR2 2nd graph CT test conditions ED distortion F test force FD Test force detection value JE Exam Completion Information JS Exam Start Information K specified number RT test results TP test specimen σ stress

Claims

1. A fatigue testing machine that repeatedly applies a test force to a specimen to measure mechanical properties of the specimen, a list screen that displays a list of test results of two or more predetermined number of fatigue tests, and displays the test results including at least the number of repetitions in association with identification information of the predetermined number of fatigue tests; Fatigue testing machine.

2. On the list screen, stress amplitudes are displayed as the test results in association with the identification information of the predetermined number of fatigue tests.

2. The fatigue testing machine according to claim 1.

3. When a user selects a plurality of fatigue test results from the predetermined number of fatigue test results on the list screen, a graph showing the relationship between the stress amplitude and the number of repetitions in the plurality of fatigue test results is displayed.

3. The fatigue testing machine according to claim 2.

4. On the list screen, strain amplitude is displayed as the test result in association with identification information of the predetermined number of fatigue tests. The fatigue testing machine according to any one of claims 1 to 3.

5. When a user selects a plurality of fatigue test results from the predetermined number of fatigue test results on the list screen, a graph showing the relationship between the strain amplitude and the number of repetitions in the plurality of fatigue test results is displayed.

5. The fatigue testing machine according to claim 4.

6. For each of the predetermined number of fatigue tests, the test conditions for the predetermined number of fatigue tests include a stress or strain waveform in one cycle of the fatigue test; The waveform includes at least one of a triangular wave and a sine wave.

2. The fatigue testing machine according to claim 1.

7. displaying a graph showing the relationship between strain and stress in one cycle of the fatigue test while each of the predetermined number of fatigue tests is being performed; 7. The fatigue testing machine according to claim 6.

8. 1. A display control method for a fatigue testing machine that repeatedly applies a test force to a test specimen to measure mechanical properties of the test specimen, comprising: a display step of displaying test results including at least the number of repetitions in association with identification information of the predetermined number of fatigue tests on a list screen that displays test results of two or more predetermined number of fatigue tests in a list; A method for controlling the display of a fatigue testing machine.

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