JP2002202227A - Method of preparing test piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preparation method for a test piece capable of conducting precisely an evaluation test for an evaluated object having a space part in its inside. SOLUTION: The test piece 1 having the space part 2 is prepared by making at first a body 3 different from the test piece 1 exist together with the test piece 1 while exposing at least one portion of the body outside the test piece 1, when the test piece 1 is molded, and by immersing thereafter the test piece 1 existing together with the body 3 into a solution 4 capable of dissolving only the body 3 to elute the body 3 from the test piece 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing a test piece having a space.

[0002]

2. Description of the Related Art As an evaluation test of fiber reinforced plastic (FRP), a test piece made of fiber reinforced plastic is
A space (void) is formed in advance as an artificial defect,
An evaluation test may be performed on the influence of this space.
Conventionally, as a method of forming a space inside a test piece, a hollow material such as silica is mixed in at the time of molding the test piece, and the hollow portion is used as a space, or machining is performed from the surface of the test piece. A hole was formed, and this hole was used as a space.

[0003]

However, in the method of mixing a granular material having a hollow portion at the time of molding a test piece, a layer of the granular material (silica) is newly formed inside the test piece. However, an attempt to form a space portion as an artificial defect results in formation of an artificial defect due to foreign matter. In this case, the test piece cannot perform a satisfactory function for performing an evaluation test on the influence of the space.

In the method of forming a hole by machining, a defect such as a microcrack may occur in a portion where the hole is formed. In this case, the test piece is also subjected to an evaluation test for the influence of the space. Can not fulfill a satisfactory function. In particular, in a fiber-reinforced plastic in which fibers are stacked, microcracks are remarkably generated by a method of machining.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of preparing a test piece capable of accurately performing an evaluation test on an object to be evaluated having a space therein. Aim.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, a method for producing a test piece according to the present invention is a method for producing a test piece having a space portion. Is mixed with the test piece while exposing at least a part of the first substance to the outside from the test piece, and then the first material is mixed with the first material. The method is characterized in that a second substance capable of dissolving a substance is acted on to elute the first substance from the test piece, thereby forming a space inside the test piece.

According to the present invention, at the time of molding a test piece, a first substance different from the test piece is mixed in advance, and then the first substance is mixed with the first substance. By acting on a second substance capable of dissolving the substance, the first
Is dissolved, and a space can be formed inside the test piece without causing other defects such as microcracks. Further, since the first substance is dissolved, no foreign matter remains inside the test piece. Therefore, when performing an evaluation test of an object to be evaluated having a space therein, the test can be performed with high accuracy using this test piece.

At this time, the test piece is a fiber-reinforced plastic, the first substance is a predetermined metal, and the second substance is an acidic or alkaline liquid. Since a test piece having desired performance at the time of performing the test can be formed, the evaluation test can be performed with high accuracy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for producing a test piece according to the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of a test piece of the present invention, and FIG. 2 is a diagram for explaining a method of producing a test piece of the present invention.

In FIG. 1, a test piece 1 has a space 2 formed therein. In the present embodiment, the test piece 1 is made of fiber reinforced plastic (FRP). The test piece 1 is used for an evaluation test of an evaluation object made of fiber reinforced plastic having a space therein. A plurality of the space portions 2 are formed in a predetermined shape in accordance with the evaluation test.

The test piece 1 having the configuration as described above
Will be described with reference to FIG.
As shown in FIG. 2A, when the test piece 1 is molded, an object 3 different from the test piece 1 is mixed in the test piece 1.
The object 3 is made of a substance (first substance) different from the substance (fiber-reinforced plastic) constituting the test piece 1. The object 3 is made of a substance having a predetermined hardness, and can be made of, for example, various metals. In the present embodiment, the object 3 is made of aluminum.

The object 3 is formed in a shape corresponding to the shape of the space 2 to be formed inside the test piece 1. Further, by having the predetermined hardness, the deformation of the object 3 itself is prevented when mixed into the test piece 1.

When the object 3 is mixed with the test piece 1,
Are mixed so that at least a part of the sample is exposed from the test piece 1 to the outside. In this case, the object 3 may be mixed so that the object 3 is exposed from the test piece 1 in advance, or the object 3 may be mixed so as not to be exposed from the test piece 1, and then the test piece 1 is cut to obtain at least the object 3. A part may be exposed to the outside. In addition, the productivity of the test piece 1 is improved by forming the large test piece 1 in which the objects 3 are mixed and cutting it into a predetermined size.

Next, as shown in FIG.
Is immersed in the solution (second substance) 4 contained in the tank 4a. The solution 4 is made of a substance that can dissolve only the object 3. As the solution 4, various acidic solutions or alkaline solutions can be used, and a substance that dissolves the object 3 and has a small attack on the test piece 1 is selected. In the present embodiment,
Since the object 3 is made of aluminum, the solution 4 is preferably an alkaline solution.

Since at least a part of the object 3 is exposed from the test piece 1 to the outside, the test piece 1 in which the object 3 is mixed is immersed in the solution 4 so that the object 3 is gradually removed from the exposed portion. Dissolve. By immersing the test piece 1 in the solution 4 for a predetermined time, all the objects 3 mixed in the test piece 1 are dissolved. Note that the time for which the test piece 1 is immersed in the solution 4 is a time sufficient for dissolving the entire object 3 and is obtained in advance by experiments or the like.

After the test piece 1 is immersed in the solution 4 for a predetermined period of time, as shown in FIG.
Remove from A space 2 is formed inside the test piece 1 by the substance 3 eluted by the solution 4.

As described above, first, at the time of molding the test piece 1, the object 3 based on the shape of the space 2 to be formed inside is mixed with the test piece 1 while partially exposing it to the outside. The space 2 is easily formed in the test piece 1 by immersing only the object 3 in the dissolvable solution 4 and elute the object 3. As described above, when preparing the test piece 1 for performing the evaluation test of the evaluation object having the space, the object 3 as the mold of the space 2 is mixed with the test piece 1 and then the object 3 is eluted. By doing so, it is possible to prevent the occurrence of other defects such as microcracks, and to immerse the test piece 1 in the solution 4 for a predetermined time so that all the objects 3 are eluted. Can be prevented from remaining. Then, since only the space 2 can be formed as an artificial defect of the test piece 1, when performing an evaluation test of the device to be evaluated having the space 2 therein, the test is performed with high accuracy using the test piece 1. be able to.

Further, since the space 2 is formed by melting the object 3 as a mold of the space 2, the space 2 having a complicated shape can be easily formed. Therefore, when performing an evaluation test using the test piece 1, various types of evaluation tests can be performed.

In this embodiment, the material of the test piece 1 is a fiber-reinforced plastic, the material of the object 3 is a metal such as aluminum, and the solution 4 is an acidic or alkaline solution capable of dissolving a metal (aluminum). However, it is of course possible to change the material of the test piece 1 depending on the target of the evaluation test. Also, as the material of the object 3, a substance other than metal can be used as long as the material has sufficient hardness as the mold of the space 2. And the type of solution 4
Any substance can be used as long as it has a small attack on the test piece 1 and can dissolve only the object 3.

The method of forming a space inside a test piece as shown in the present embodiment can be applied not only to the preparation of a test piece but also to various solid objects.

[0021]

According to the method for preparing a test piece of the present invention, when preparing a test piece for performing an evaluation test of an object to be evaluated having a space, first, at the time of molding the test piece, First, a first substance (object) different from the test piece is mixed in advance, and then the test piece in which the first substance is mixed is
Forming a space in a test piece without causing other defects such as microcracks because the first substance is eluted by acting on a second substance (solution) capable of dissolving the first substance. Can be. Further, since the first substance is eluted, no foreign matter remains inside the test piece. As described above, since only the space portion can be formed as an artificial defect of the test piece, when performing the evaluation test of the device to be evaluated having the space portion inside, it is possible to perform a highly accurate test using the test piece. it can.

[Brief description of the drawings]

FIG. 1 is a view for explaining a test piece prepared by a method for preparing a test piece according to the present invention.

FIG. 2 is a diagram for explaining a method for producing a test piece according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test piece 2 Space part 3 Object (1st substance) 4 Solution (2nd substance)

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Katsuyoshi Moriya 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries Co., Ltd. Yokohama Engineering Center (72) Inventor Hajime Izu Hajime-cho, Tanashi-shi, Tokyo No.3-1 5-chome Ishikawa Shima-Harima Heavy Industries Co., Ltd. Tanashi Factory F-term (reference) 2G052 AA18 AD52 FD09 JA08 JA16

Claims (2)

[Claims] 1. A method for preparing a test piece having a space, wherein a first substance different from the test piece is exposed at least partially to the outside of the test piece at the time of molding the test piece. Mixed with the test piece, and then mixed with the first substance,
Producing a test piece, wherein a second substance capable of dissolving the first substance is acted on to elute the first substance from the test piece to form a space inside the test piece. Method. 2. The test piece according to claim 1, wherein the test piece is a fiber-reinforced plastic, the first substance is a predetermined metal, and the second substance is an acidic or alkaline liquid. How to make a test piece.