JPH07916Y2 - Material testing machine - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a material testing machine having a test jig used for testing a split sleeve-shaped specimen.

B. Conventional Technique A split sleeve is a pipe provided with a split groove 51 extending in the longitudinal direction, as shown by reference numeral 50 in FIG. 3, for example.
As a test jig used for testing such a split sleeve 50, conventionally, for example, a pair of round bar-shaped load tools is inserted into the split sleeve and driven up and down, thereby applying a radial load to the split sleeve. What to give is known.

C. Problem to be Solved by the Invention However, in the conventional jig, when the split sleeve is attached, the load tool is inserted into the split sleeve and then connected to the test jig, so that it is troublesome to install the split sleeve. It takes. Further, since the above-mentioned load tool is connected to the jig main body by using a belt or the like, the rigidity is weak and the load tool itself may be deformed during the test.

An object of the present invention is to provide a material testing machine having a split sleeve test jig in which the split sleeve can be easily mounted and the load portion is prevented from bending.

D. Means for Solving the Problem To explain with reference to FIG. 1 showing an embodiment, the present invention is a split sleeve used when the split sleeve 50 is radially loaded by the load means 1, 2. It is carried out on a material testing machine having a testing jig. Then, load shaft 1
Load means 1, so that the tips contact each other in the plane including
2 is provided with a pair of plate members 30, the plate member 30 is provided with an opening 31 for mounting the split sleeve 50, and the edge 32a of the opening 31 on the surface contact portion side is formed at an acute angle. Split sleeve 5
It makes a line contact with 0, thereby solving the above problem.

E. Action The split sleeve 50 is attached from the opening 31 and a load is applied by the load means 1 and 2. Since the opening 31 is provided in this manner, the split sleeve 50 can be easily mounted. Further, since the portion that abuts the split sleeve 50 is integral with the plate member 30, the composition of this portion will not be strongly deformed. Further, since the edge portion 32a of the opening 31 on the side of the surface contact portion is formed at an acute angle, the split sleeve 50 makes a line contact on the load shaft l, so that the eccentric load does not act on the split sleeve 50.

It should be noted that although the drawings of the embodiments for facilitating understanding of the present invention are used in the above-mentioned D and E for explaining the configuration of the present invention, the present invention is not limited to the embodiments.

F. Embodiment An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 (a) is a front view showing a material testing machine according to the present invention,
1 (b) is a side view thereof, and FIG. 1 (c) is c of FIG.
FIG. 6 is an enlarged sectional view taken along line c.

100U and 100D are upper and lower test jigs. The upper test jig 100U is connected to the upper fixed rod 1 of the tester body, and the lower test jig 100D is connected to the lower load rod 2 so as to face each other. The upper and lower test jigs 100U and 100D have exactly the same configuration, and each jig includes a jig body 10, a reinforcing plate 20, and a thin plate member 30 sandwiched between the jig body 10 and the reinforcing plate 20. The jig body 10 comprises a fixed rod 1 or a load rod 2
And a flat plate portion 12 integrally connected to the connecting portion 11. Here, FIG. 1 (a) shows a state in which the flat plate portion 12 on the upper jig 100U side is removed.
Further, in FIG. 1B, the thin plate member 30 is exaggerated and drawn thicker than it actually is.

The flat plate portion 12 and the reinforcing plate 20 are respectively formed with notches 12a and 21 cut out from the tip portion thereof, and the thin plate member 30
An opening 31 (FIG. 2) having substantially the same shape as the cutouts 12a and 21 is formed in this. Then, the thin plate member 30 is sandwiched between the flat plate portion 12 and the reinforcing plate 20 via the bolt 41 so that the notches 12a, 21 and the opening 31 are overlapped with each other, and the load portion 32 at the tip end is fixed as shown in FIG. 1 (c). Surface contact is made in a plane including the load axis 1. This load part
A split sleeve 50 (Fig. 3) as a test piece is attached to 32. A portion 32a of the vertical load portion 32 on the side of the opening 31 has an acute angle and is in line contact with the inner surface of the split sleeve 50 on the load shaft l. Here, the thickness when the load portions 32 are overlapped with each other is made smaller than the width of the groove 51 of the split sleeve 50.

Next, the operation of the embodiment will be described.

When carrying out the test, first load the split sleeve 50 from one of the upper and lower openings (the cutouts 12a, 21 and the opening 3 overlap each other) with the load parts 32 of the upper and lower test jigs 100U and 100D in surface contact. Attach to part 32. That is, after the split groove 51 of the split sleeve 50 is hooked on the load portion 32, the split sleeve 50 is rotated by approximately 90 degrees to obtain the state shown in FIG. 1 (c). As described above, in this embodiment, since the opening is provided, the split sleeve 50 can be mounted extremely easily as compared with the conventional case.

After mounting the split sleeve 50, when the load rod 2 of the tester body is driven to lower the lower jig 100D, the load portion 32 of the upper and lower thin plate members 30 relatively moves and the tip of the acute angle portion 32a moves to the load axis l.
Line contact is made with the inner surface of the split sleeve 50. When the lower jig 100D is further lowered in this state, a radial load is applied to the split sleeve 50. In this way, since the contact portion of the vertical load portion 32 with the split sleeve 50 is located on the load shaft l,
Accurate test results can be obtained without the eccentric load acting on the split sleeve 50. In addition, the load part 32 is a thin plate member 30.
Since it is formed integrally with, the rigidity is strong and this part does not deform.

In the above, a thin plate member is provided between the jig body 10 and the reinforcing member 20.
Although the configuration is such that the load portion 32 is formed integrally with the thin plate member 30 by sandwiching the thin plate member 30, the jig body 10 is not provided, for example.
The load portion may be formed integrally with the.

G. Effect of the Invention With the configuration of the present invention as described above, the split sleeve can be attached more easily than before, and the rigidity of the load part can be increased to prevent deformation of the load part. In addition, since the vertical load portion makes line contact with the split sleeve on the load shaft, an accurate test result can be obtained without an eccentric load acting on the split sleeve.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, and FIG. 1 (a) is a front view showing a split sleeve test jig used in a material testing machine according to the present invention, and FIG. 1 (b). ) Is a side view thereof, FIG. 1 (c) is an enlarged sectional view taken along line cc of FIG. 1 (a), FIG. 2 is a view showing a thin plate member, and FIG. 3 is a perspective view showing a split sleeve. . 10: Jig body, 12: Flat plate part 12a, 21: Notch 20: Reinforcement material, 30: Thin plate member 31: Opening, 32: Load part 32a: Sharp corner part, 50: Split sleeve

Claims (1)

[Scope of utility model registration request] 1. A material testing machine having a split sleeve test jig used when a split sleeve is loaded in a radial direction by a loading means, wherein the split sleeve test jig comprises:
There is provided a pair of plate members mounted on the load means such that their tips are in surface contact with each other in a plane including the load shaft, and an opening for mounting a split sleeve is formed in the plate members. The material testing machine is characterized in that the edge portion on the contact portion side is formed at an acute angle so as to make line contact with the split sleeve.