JPH0645244Y2 - Cylindrical strength tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a strength test apparatus, and more particularly to a strength test apparatus for a cylindrical body that applies an internal pressure to the cylindrical body in a high temperature atmosphere to perform a strength test.

(Prior Art) Due to technological innovation in recent years, a tubular body is often used in a high temperature atmosphere. In particular, a cylindrical body made of a material having high heat resistance such as ceramics is used in an atmosphere of 1000 ° C or higher.

Therefore, it is necessary to understand the pressure resistance under such a high temperature atmosphere.

FIG. 5 shows a conventional apparatus for performing a withstand voltage test, 1 is a lower jig, and 2 is a lower jig.
Is an upper jig, and the cylindrical test body 3 is housed in the recess of the lower jig 1. At the time of accommodation, the lower end surface of the test body 3 is brought into contact with the bottom surface of the lower jig 1, and the upper end surface of the test body 3 is brought into contact with the inner surface of the upper jig 2, and the seal member 4 is attached to these contact portions. Set up. Reference numeral 5 denotes a piston, which is slidably inserted in the through hole of the upper jig 2.

To perform the strength test, the test body 3 is filled with oil, and then the piston 5 pressurizes the oil.

Although oil is used in the above example, there is an example in which rubber is used instead of oil. When using rubber, a gap is provided between the inner surface of the upper jig 2 and the upper end surface of the test body 3. By doing so, when fixing the upper jig 2 to the lower jig 1, no load is applied to the test body 3.

(Problems to be Solved by the Invention) In the above conventional example, the high temperature atmosphere is limited to about several hundreds of degrees Celsius. That is, at a temperature higher than that, the oil boils, and when the test body 3 is broken by the hydraulic pressure, the boiled oil scatters, which is dangerous.

Further, when rubber is used instead of oil, the rubber becomes a fluid, and when the test body 3 is destroyed by the internal pressure, it adheres to the fracture surface of the test body 3, which makes it impossible to analyze the fracture surface of the test body. Is.

Note that, for example, in JP-A-48-69590, a flexible tube is inserted into a cylindrical test body, the oil filled in the tube is pressurized to deform the tube, and an internal pressure is applied to the test body. Such a strength test device is described. However, with this device, when the test piece is destroyed, there is a risk that the tube will be damaged by the impact or debris, and the tube will be in direct contact with the test piece. There is a danger that heat will be transferred to the filler in the container and the oil will overheat, and this will not solve the underlying problem.

The present invention was made to solve the above problems,
An object of the present invention is to obtain a strength test device capable of stably performing a strength test of a cylindrical test body in a high temperature atmosphere.

(Means for Solving Problems) In order to achieve the above object, the present invention provides a cylindrical test body,
A container that is inserted into the test body and that is deformable under pressure; a tubular load member that is interposed between the container and the test body and that is divided into a plurality of parts in the circumferential direction and is expandable and contractible. It is characterized by comprising a filler to be filled in the container, and a pressurizing means for applying an internal pressure to the test body via the load member by deforming the container by pressurizing the filler. To do.

(Function) Even if the test body is destroyed, the load member protects the container,
The destruction of the container is prevented, the scattering of the filler to the outside is surely prevented, and moreover, the load member suppresses the heat transfer to the filler, so that it can be effectively used for the high temperature strength test.

(Effect of the device) Since the filler does not scatter from the container even if the test body is destroyed as described above, there is no risk of fire and the filler does not adhere to the fracture surface of the test body. Fracture surface analysis does not become impossible, so strength tests can be performed even in a high temperature atmosphere.

Further, since the test body is not fixed with a jig as in the conventional case, an external force is not applied, so that the strength test can be performed only with pure internal pressure.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, 10 is a test body made of a tubular body such as an automobile brake tube and a water pipe. A tubular cushion material 11 is fitted inside the test body 10, and the cushion material 11 A load member 12 having a circular cross-section having a through hole 12a in the center is fitted to the through hole 12a of the load member 12, and a cylindrical container 13 having a bottom is inserted into the container 13. It is filled.

When the filling material 14 is pressurized with such a configuration, this pressing force is transmitted to the test body 10 via the load member 12 and the cushion material 11.

Hereinafter, each of the above components will be sequentially described. The cushion material 11 uniformly transmits the internal pressure acting on the load member 12 to the inner surface of the test body 10, and the cushion material 11 is preferably a heat insulating material. The reason for this is that it is not preferable that the heat of the test body 10 in a high temperature atmosphere is transferred to the filling material 14, and if a metal having a high thermal conductivity is used as the material of the cushion material 11, the inner surface of the test body 10 will be used. This is because the heat of is removed and the temperature of the test body 10 is not uniform. Specific examples of the material of the cushion material 11 include heat resistant ceramic fibers such as alumina and alumina silicate, and if these are used, they can be subjected to a test of several thousand and several hundred degrees.

The load member 12 is formed by dividing a columnar body having a through hole 12a in the central portion into a plurality of pieces in the circumferential direction, and the load member 12 is provided with a cooling hole 15 into which cooling water is introduced. The hole 15 is for preventing the heat of the test body 10 from being transferred to the filling material 14.

The container 13 is deformed so as to be expanded by the pressure of the filling material 14 and applies an internal pressure to the load member 12. However, it is desirable that the deformation of the container 13 is elastic deformation. Therefore, the material of the container 13 is an elastic material. Is preferred. Specifically, a polymer material such as rubber or plastic is preferable.

Returning to FIG. 1, reference numeral 16 denotes a support, to which the lower portion of the load member 12 is fixed. The support 16 has a fixing hole 16a into which the lower end of the container 13 is fitted and a cooling water passage 17. The water passage 17 communicates with the cooling hole 15 of the load member 12, and the cooling water is supplied from the water passage 17 to the cooling hole 15. twenty one
Is a leak-proof tube, one end of which is fitted into the cooling hole 15 and the other end of which is fitted into the cooling water passage 17, so that
Preventing leakage from the gap between 12 and the support 16.

The upper end of the load member 12 is fixed by a pair of first and second jigs 18 and 19. The upper end of the first jig 18 is formed into a small diameter portion, and this small diameter portion is fitted in the recess of the second jig 19. Further, through holes 18a, 19a are formed in the respective central portions of the first and second jigs 18, 19, and the upper end portion of the container 13 is fitted into the through holes 18a of the first jig 18. , And this through hole
The protruding portion of the container 13 protruding from 18a is expanded outward, and the expanded portion is held between the first and second jigs 18 and 19.
The through hole 19a of the second jig 19 communicates with the container 13, and the filling material 14 is filled into the container 13 through the through hole 19a.

Reference numeral 20 is a cylindrical heat insulating material provided on the outside of each of the support 16 and the first and second jigs 18 and 19, and heats the upper and lower ends of the container 13 from a high temperature atmosphere to raise the temperature of the filling material 14. Is to prevent. A part of the heat insulating material 20 reaches the outside of the upper and lower ends of the load member 12 to play a role of preventing the load member 12 from scattering when the test body 10 is broken.

The pressure of the filling material 14 is performed by a pressure means, which is installed above the first jig 18 and includes a piston or a hydraulic pressure supply device (not shown).

Next, the operation of the device having the above configuration will be described. After filling the container 14 with the filling material 14 such as oil, when the filling material 14 is pressurized under a high temperature atmosphere of several hundreds of degrees Celsius or more, the upper and lower ends of the container 13 are fixed, so that the central portion expands and the load member Press 12 onto cushion material 11. The cushion material 11 receives a load from the load member 12 and expands outward to apply an internal pressure to the test body 10.

In this way, the pressure of the filling material 14 increases, and when the pressure reaches a certain pressure, the test body 10 breaks. However, even if the test body 10 is broken in this way, the filler 14 does not scatter out of the container 13, and therefore no danger occurs even at a high temperature such as boiling oil, and the rubber is liquefied. However, it does not adhere to the test body 10.

3 and 4 show another embodiment of the present invention, which is different from the first embodiment in the following points. That is, in this embodiment, as shown in FIG.
Is composed of inner and outer double tubes 12A and 12B, and the outer tube 12B is divided into four in the circumferential direction.

The reason for doing this is to make the internal pressure applied to the test body 10 more uniform.

The other structure is similar to that of the first embodiment, and therefore the description is omitted. In FIGS. 3 and 4, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts.

[Brief description of drawings]

1 is a front sectional view of a strength tester for a tubular body according to the present invention, FIG. 2 is a transverse sectional view of FIG. 1, and FIGS. 3 and 4 show other embodiments of the present invention. 1 and FIG. 2, and FIG. 5 are sectional views of a conventional tubular body strength test apparatus. 10 …… Cylinder 13 …… Container 14 …… Filler

Claims (1)

[Scope of utility model registration request] 1. A cylindrical test body, a container which is inserted into the test body and can be deformed under pressure, and which is interposed between the container and the test body and is divided into a plurality in the circumferential direction. A tubular load member that can be expanded and contracted, a filling material filled in the container, and a pressure applied to the filling material to deform the container to apply an internal pressure to the test body through the loading member. A strength tester for a tubular body, comprising: a pressure means.