JPS623639A - High-speed tensile and compression tester - Google Patents

Abstract

PURPOSE:To test easily materials by a high-speed load with high precision by operating an attaching and detaching device to switch the tester to the high-speed load providing state where a loading bar can be moved relatively to a load supporting stand. CONSTITUTION:A spring 22 is interposed between a spring supporting part 18A of a load supporting base 16 and a spring receiving part 21 of a load bar 19, and a dummy test piece is attached to the part of a test piece 13. An attaching and detaching device 23 is detached from the load bar 19, and a cross head 12 is lowered in this state and the spring 22 is contracted to provide a certain elastic state to the spring 22. In such a state, the load bar 19 is fixed to the supporting stand 16 by the device 23 to set the initialized state. The head 12 is raised slightly while keeping such a state to release the load acting upon the dummy test piece, and the actual test piece 13 is set instead of the dummy test piece. The device 23 is operated to switch the device to the high- speed load providing state where the load bar 19 can be moved relatively to the stand 16. The load bar 19 is moved in a high speed by the action of the elastic force of the spring 22, and a high-speed tensile load is provided to the test piece 13 to test it with high precision by the high-speed load.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a high speed tension compression testing device.

[Prior Art] Mechanical properties of industrial materials such as steel materials include dynamic tensile properties or dynamic fracture toughness, which are properties when a load is applied to the material at high speed.

In order to investigate the material properties mentioned above, it is necessary to set the loading rate to 1.
A test device capable of high-speed loading of approximately m/s is required.

The maximum load speed of an ordinary screw-type material testing machine is about 5001 layers/min, and even for a hydraulic servo-type testing machine used for fatigue testing, it is at most 0.1 m/sec.

[Problems to be Solved by the Invention] Therefore, when trying to obtain a load speed of about in/second, it is necessary to use an impact tester such as a Charpy tester or a thin tester, or to use a special servo mechanism. It is necessary to use a equipped testing machine. However, the former method has difficulty in measuring the load, and the latter method requires the preparation of a testing machine with an extremely complex structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-speed tensile compression testing device that can easily and accurately perform material testing under high-speed loading.

[Means for Solving the Problems] The present invention has a fixed part and a movable part that moves linearly with respect to the fixed part, and applies a load to a test piece mounted between the fixed part and the movable part. In a high-speed tensile compression testing device that can load A load-bearing rod is provided with a spring receiving part on the other end side facing the spring supporting part, and the load-bearing rod is interposed between the spring supporting part of the load-bearing base and the spring receiving part of the load-bearing rod, and the load is applied in the direction of the load on the test piece. a spring that can be triggered to
The device is provided with an attachment/detachment device that is disposed on the load support base and is attached to and detached from the load support bar so that the load support bar can be fixed or moved relative to the load support base.

[Function] In the high-speed tension and compression testing apparatus according to the present invention, first, the spring between the spring support part of the load support table and the spring receiving part of the load load rod is elasticized, and the load is removed by operating the attachment/detachment device. While the load rod is fixed to the load support base, a test piece is attached between the other of the fixed part or the movable part and the connecting part of the load rod.

Next, the loading/unloading device is operated to switch to a high-speed loading state in which the load loading rod can be moved relative to the load support. Thereby, the load-bearing rod moves at high speed under the action of the elastic force of the spring, making it possible to apply a high-speed load to the test piece.

[Example] FIG. 1 is a schematic diagram showing a test device 10 according to an example of the present invention, and FIG. 2 is a schematic diagram showing main parts of the test device 10.

The test device 10 includes a pedestal 11 as a fixed part and a pedestal 11.
Crosshead 12 as a movable part that moves linearly against
have.

The pedestal 11 has a connecting portion 14 that connects to the upper end of the test piece 13.
and a load cell 15.

A box-shaped load support stand 16 is fixed to the cross member 12 by a port 17. The load support stand 16 includes a spring support section 18A for tensile tests and a spring support section 18B for compression tests.

19 is a load bearing rod. The load-bearing rod 19 is vertically installed inside and outside the load-bearing table 16, and has a connecting portion 2 connected to the lower end of the test piece 13 at one end located outside the load-bearing table 16.
0, and on the other end side located inside the load support base 16,
A dish-shaped spring receiving portion 21 is provided. The spring receiving part 21 is located opposite to the spring supporting parts 18A and 18B of the load supporting table 16.

A spring 22 can be interposed between the spring support parts 18A, 18B of the load support stand 16 and the spring receiving part 21 of the load application rod 19. The spring 22 is capable of expanding and contracting in the direction of the load applied to the test piece 13. That is, the spring 22 expands and contracts due to the relative movement between the load support base 16 and the load load rod 19, and is elastically enabled, and the spring 22 moves the load support rod 19 relative to the load support base 16 by its elastic force. This makes it possible. In FIG. 1, a spring 22 is interposed between the spring support part 18A of the load support stand 16 and the spring receiving part 21 of the load loading rod 19, so that a tensile load can be applied to the test piece 13 as described later. This is an example of a weapon that can be used for ammunition.

The load support base 16 has an attachment/detachment device M23.The attachment/detachment device 23 is constructed as shown in FIG. is accommodated, and hydraulic oil can be accommodated between the housing 24 and the holding plate 25. Housing 24 and presser plate 2
5 includes seal members that are rubbed together to prevent leakage of pressurized hydraulic oil. Reference numeral 26 denotes a manual hydraulic pump, which generates a predetermined hydraulic pressure by operating a handle, and applies the hydraulic pressure to the hydraulic oil between the housing 24 and the holding plate 25 through a hydraulic hose 27, so that the holding plate 25 is connected to the load rod 19. The load-bearing rod 1 is pressed against the middle part of
9 can be fixed to the load support stand 16.

At the start of a high-speed load test, if the load-bearing rod 19 is to be movable relative to the load support base 16 as described later, the hydraulic pressure relief valve 28 is opened to reduce the above-mentioned hydraulic pressure, and the load applied by the presser plate 25 is reduced. The press-contact state of the load rod 19 can be instantly released.

Next, the operation of the above embodiment will be explained.

A method of using the test apparatus 10 as a high-speed tensile test apparatus will be explained. First, as shown in FIGS. 3(A) to 3(C), the spring 22 is interposed between the spring support part i8A of the load support stand 16 and the spring receiving part 21 of the load bearing rod 19, and the first
A dummy test piece is attached to the test piece 13 in the figure, and with the attachment/detachment device 23 detached from the load bearing rod 19 as shown in Figure 3 (A), the Rad 12 is attached to the cross as shown in Figure 3 (B). As shown in , lower the distance ML and contract the spring 22.
2. Obtain a certain explosive state. In this state, 1 attachment/detachment device 23
The initial setting state shown in FIG. 3(B) in which the load-bearing rod 19 is fixed to the load support base 16 is established by the following steps. Next, while maintaining the above initial setting state, the crosshead 12 is slightly raised to release the load acting on the dummy test piece, and an actual test piece 13 is attached in place of the dummy test piece.

Next, the loading/unloading device 23 is operated to switch to a high-speed loading state in which the load loading rod 19 can be moved relative to the load support base 16 . As a result, as shown in FIG. 3(C), the load-bearing rod 19 moves at high speed under the action of the elastic force of the spring 22, making it possible to apply a high-speed tensile load to the test piece 13.

When the test apparatus 10 is used as a high-speed compression test apparatus, as shown in FIGS. By interposing the spring 2z between them, it becomes possible to perform a compression test using the same operation as the above-mentioned tensile test.

FIG. 5 is a diagram showing an example of a load-hour curve when a high-speed tensile test is conducted using the testing apparatus according to the present invention. The average tensile speed in this case was 0.5 m/sec.

In the practice of the present invention, the tension speed or compression speed can be adjusted by changing the stiffness and initial load of the spring 22. For example, 100Kgf/a
25 mm thick using a coil spring with a spring constant of m
When performing high-speed tensile tests on CT specimens, it is possible to obtain tensile speeds of 0.4 to 1.3 m/s by changing the initial load applied to the spring from 3 tons to 5 tons. .

[Effects of the Invention] As described above, the present invention has a fixed part and a movable part that moves linearly with respect to the fixed part, and applies a load to a test piece attached between the fixed part and the movable part. In a high-speed tensile compression testing device that can load a load-bearing rod having a spring receiving portion located opposite to the spring supporting portion on the other end side;
A spring is interposed between the spring support part of the load support base and the spring receiving part of the load load rod, and is resilient in the direction in which the load is applied to the test specimen. The load-bearing rod is attached to and detached from the load support base so that the load-bearing rod can be fixed or moved relative to the load support base.

Therefore, it is important to easily and accurately perform material testing under high-speed loading.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a test device according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing the main parts of the test device, and FIG. 3 (A
) to (C) are process diagrams showing tensile test conditions using the same testing device, Figures 4 (A) to (C) are process diagrams showing compression test conditions using the same testing device, and Figure 5 is a process diagram showing the implementation of the present invention It is a diagram showing a load-hour curve obtained by. DESCRIPTION OF SYMBOLS 10... Test device, 11... Frame, 12... Cross head, 13... Test piece, 16... Load support stand,
18A, 18B...Spring support part, 19...Load bearing rod, 20...Joining part, 2nd work...Spring receiving part, 22...
・Spring, 23... attachment/detachment device. Agent Patent Attorney Osamu Shiokawa 1 Figure 2 Portion 3 Figure 4 (C) (C)

Claims (1)

[Claims] (1) In a high-speed tensile compression test device that has a fixed part and a movable part that moves linearly with respect to the fixed part, and is capable of applying a load to a test piece installed between the fixed part and the movable part. , a load support that is fixed to one of the fixed part or the movable part and includes a spring support, and a spring receiver that has a coupling part that connects to the test piece on one end side and is located opposite to the spring support of the load support. A load-bearing rod provided on the other end side, a spring interposed between the spring support part of the load-bearing base and the spring receiving part of the load-bearing rod, and capable of elasticity in the direction in which the load is applied to the test specimen; A high-speed tensile compression testing device characterized by having an attachment/detachment device disposed on a support base and attached to and detached from a load-bearing rod so that the load-bearing rod can be fixed or moved relative to the load support base. .