JPH0226009Y2 - - Google Patents

Description

[Detailed explanation of the device] (a) Industrial application field This device is used to calculate the amount of axial displacement and torsional displacement between the gauge points of the specimen in material tests in which the specimen is deformed in the axial and torsional directions. This invention relates to a gauge-to-gauge two-axis displacement meter that measures the distance between gauges.

(b) Prior art As is well known, when a test piece is subjected to an axial load such as a tensile load and a torsional load at the same time, the test piece is deformed in both the axial and torsional directions and subjected to a combined stress strength test. Can be done.

However, to achieve the purpose of the test,
It is necessary to measure the axial displacement and torsional displacement between the gauge points of the test piece with high precision. Conventionally, it was not possible to extract the axial displacement and torsional displacement with high precision, especially when the axial displacement and torsional displacement between the gauges appeared as large repeated displacements, and the measurement was not carried out. I couldn't do it.

(C) Purpose Therefore, in this type of combined stress strength test, even if the axial displacement between gauge points of the specimen and the torsional direction displacement appear as large repeated displacements, this invention This was designed to allow the amount of displacement and the amount of displacement in the torsional direction to be extracted and measured with high precision.

(d) Configuration This device measures the axial displacement and torsional displacement between gauge points of the test specimen using strain gauges attached to the leaf spring. A leaf spring freely deforms and bends in its direction of deflection, but does not deform in its width direction. This idea was made by paying attention to the properties of this leaf spring.The leaf spring to which the strain gauge is attached is deflected in the same direction as the axial direction of the test piece, and the width direction is the same as the torsion of the test piece. Place it in the same direction as the direction. Then, one end of this spring is attached to a fixing member fixed to one of the gauge points of the test piece.
The other end is brought into contact with a fixing member fixed to the other gauge of the test piece so as to be movable in the twisting direction of the test piece. As a result, the amount of displacement in the torsional direction between the gauge points of the test piece is absorbed, and only the amount of displacement in the axial direction is taken out. Furthermore, another leaf spring with a strain gauge pasted on it was placed so that its width direction was in the same direction as the axial direction of the test piece, and its deflection direction was in the same direction as the test piece's torsional direction. One end of the spring is attached to a fixing member fixed to one gauge of the test piece, and the other end is brought into contact with a fixing member fixed to the other gauge of the test piece so as to be movable in the axial direction of the test piece. As a result, the amount of axial displacement between the gauge points of the test piece is absorbed, and only the amount of displacement in the torsional direction is taken out.

(E) Embodiments Hereinafter, embodiments of this invention will be explained with reference to the drawings.

In the figure, a test piece 1 is in the shape of a round bar extending in the vertical direction. In this embodiment, a pair of upper and lower fixing rings 2 and 3 are used as fixing members that are fixed to the gauge points of the test piece 1. As shown in FIG. 1, each fixing ring 2, 3 has four knife edges 4, which are arranged concentrically with the specimen 1, and each knife edge 4 is equiangularly spaced around the specimen 1. The test piece 1 is placed on the test piece 1 and protrudes inward toward the test piece 1. Each of the fixed rings 2 and 3 consists of a split ring divided into two parts, and the sleeve 5
It is guided in an openable and closable manner by bolts 6 and 6, and is biased in the closing direction by the elasticity of spring 7.
A spring 7 presses each knife edge 4 against the test piece 1. With this, each fixing ring 2, 3
are fixed at each gauge point of the test piece 1. The force with which the knife edge 4 is pressed against the test piece 1 can be arbitrarily adjusted using the adjustment nut 8. Furthermore, each fixing ring 2, 3 has four leaf springs 9 each, each spring 9 being equally angularly spaced around the specimen 1 above the upper ring 2 and below the lower ring 3. The test piece 1 is placed in the same position as the test piece 1 and is pressed against the test piece 1. Leaf spring 9 as test piece 1
The force with which it is pressed can be arbitrarily adjusted using the adjustment screw 10. Each leaf spring 9 is slidably in contact with the test piece 1 in its axial and torsional directions, allowing deformation of the test piece 1 in the axial and torsional directions, and each of the fixing rings 2,
3 is held concentrically with respect to the test piece 1.

In this embodiment, four leaf springs 1 are arranged on both left and right sides and front and rear sides of the upper fixing ring 2.
Strain gauges 15 are attached to each of 1, 12, 13, and 14. The leaf springs 11 and 12 on both the left and right sides are arranged so that their deflection directions are the same as the axial direction of the test piece 1, and their width directions are the same as the twisting direction of the test piece 1. One end of each leaf spring 11, 12 is attached to the upper fixing ring 2, and the other end is pressed against the head 18 of the adjusting screw 17 via a spherical projection 16. The adjustment screw 17 is attached to the mounting bracket 19 of the lower fixing ring 3.
are screwed together. The protrusion 16 is connected to the adjustment screw 1
The test piece 1 is slidably slidable in the torsional direction relative to the head 18 of the test piece 1 at a point. Therefore, the other end of each leaf spring 11, 12 is in contact with the lower fixing ring 3 so as to be movable in the torsional direction of the test piece 1. Leaf springs 13 and 14 on both front and rear sides
, on the other hand, is arranged so that its plate width direction is in the same direction as the axial direction of the test piece 1, and its deflection direction is in the same direction as the twisting direction of the test piece 1. Each leaf spring 13,
One end of 14 is attached to the upper fixing ring 2, and the other end is attached to the adjustment screw 21 through the spherical protrusion 20.
is pressed against the head 22 of. Adjustment screw 2
1 is screwed onto the mounting bracket 23 of the lower fixing ring 3. The protrusion 20 makes point contact with the head 22 of the adjusting screw 21 so as to be slidable in the axial direction of the test piece 1 relative to it. Therefore, each leaf spring 13,
The other end of the test piece 14 is in contact with the lower fixing ring 3 so as to be movable in the axial direction of the test piece 1 .

In the gauge-to-gauge biaxial displacement meter configured as described above, when an axial load such as a tensile load is applied to the test piece 1 and a torsional load is applied at the same time, the test piece 1 is deformed in the axial and torsional directions. and can be subjected to a composite stress strength test. When the specimen is deformed in the axial and torsional directions between its gauge points, each fixing ring 2, 3 is relatively displaced in the axial and torsional directions of the specimen.

The left and right leaf springs 11 and 12 can be freely deformed and deflected in the direction of deflection. Therefore, when each fixing ring 2, 3 is relatively displaced in the axial direction of the test piece 1, each leaf spring 11, 12 deforms accordingly, and the strain thereof changes. The strain gauge 15 is connected to each leaf spring 1.
Detect distortions of 1 and 12. In this way, the amount of axial displacement between the gauge points of the test piece 1 is measured. It is also possible to extract and measure the average value of the detected amount detected by the strain gauge 15 of each leaf spring 11, 12 as the amount of axial displacement between the gauge points.

Each leaf spring 11, 12 does not deform in the width direction thereof. Therefore, even if the fixing rings 2 and 3 are relatively displaced in the torsional direction of the test piece 1, the strain in the leaf springs 11 and 12 is not affected by this. When each fixing ring 2, 3 is relatively displaced in the torsional direction of the specimen 1, each protrusion 16 slides on the head 18 of the adjusting screw 17 in the torsional direction of the specimen 1. As a result, the amount of displacement in the torsional direction between the gauge points of the sample specimen 1 is absorbed. Therefore, only the amount of axial displacement between the gauge points is taken out by the strain gauge 15. Since each protrusion 16 only makes point contact with the head 18 of the adjusting screw 17, the friction between them is small. Therefore, the protrusion 16 slides smoothly on the head 18 of the adjusting screw 17, and accurately absorbs the amount of displacement in the torsional direction between the gauge points.

Similarly, the front and rear leaf springs 13 and 14 are also freely deformed and bent in the direction of deflection, but do not deform in the width direction. When the fixing rings 2 and 3 are relatively displaced in the torsional direction of the test piece 1, the leaf springs 13 and 14 are deformed accordingly, and the strain thereof changes. The strain gauge 15 is connected to each leaf spring 1.
3.14 distortion is detected. Therefore, the amount of displacement in the torsional direction between the gauge points of the test piece 1 is measured.
The average value of the detection values detected by the strain gauges 15 of each of the leaf springs 13 and 14 can also be extracted and measured as the amount of displacement in the torsional direction between the gauge points. Furthermore, when the fixing rings 2 and 3 are relatively displaced in the axial direction of the test piece 1, each protrusion 20 slides on the head 22 of the adjusting screw 21 in the axial direction of the test piece 1. Therefore, the amount of displacement in the axial direction between the gauge points of the test piece 1 is absorbed, and only the amount of displacement in the torsional direction is extracted. Each protrusion 20 corresponds to the head 2 of the adjusting screw 21.
2, the friction between them is small, and the protrusion 20 is in contact with the head 2 of the adjusting screw 21.
2 Slide smoothly on the top.

Therefore, even if the axial displacement and torsional displacement between the gauge points of test piece 1 appear as large repeated displacements, these axial displacement and torsional displacement should be extracted with high precision and measured respectively. be able to.

In addition, in this embodiment, each leaf spring 11, 12,
Although one end of each of 13 and 14 is attached to the upper fixing ring 2 in the above description, it may be attached to the lower fixing ring 3 depending on the case. and,
Similar effects can be obtained even if the other end of each leaf spring 11, 12, 13, 14 is movably brought into contact with the upper fixing ring 2 in the torsional or axial direction of the test piece 1. . Each leaf spring 11,1
Among the leaf springs 2, 13 and 14, one end of some of the leaf springs may be attached to the upper fixing ring 2, and one end of the other leaf springs may be attached to the lower fixing ring 3.

(f) Effects As explained above, this device can extract and measure the axial displacement and torsional displacement between the gauge points of the test piece with high accuracy, and achieves the intended purpose. It is something that can be done.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of this invention, Fig. 2 is a front view of Fig. 1, and Fig. 3 is a - of Fig. 1.
FIG. 1... Test piece, 2, 3... Fixing ring, 11,
12, 13, 14... leaf spring, 15... strain gauge.

Claims (1)

[Scope of utility model registration request] A leaf spring with a strain gauge attached is arranged so that its deflection direction is in the same direction as the axial direction of the test piece, and the board width direction is in the same direction as the torsion direction of the test piece, and one end of this leaf spring is attached to the test piece. The test piece is attached to a fixing member fixed to one gauge point of the test piece, the other end is movably in contact with the fixing member fixed to the other gauge point of the test piece in the torsion direction of the test piece, and a strain gauge is attached. On the other hand, place another leaf spring attached so that its width direction is in the same direction as the axial direction of the test piece, and its deflection direction is in the same direction as the torsion direction of the test piece, and one end of the other leaf spring is Each of the leaf springs is attached to a fixing member fixed to one gauge point of the test piece, and the other end is brought into contact with the fixing member fixed to the other gauge point of the test piece so as to be movable in the axial direction of the test piece. A biaxial displacement meter between gauges, characterized in that the strain gauge measures the axial displacement and torsional displacement between the gauges of a test piece.