JPH0559278U - Jig for compound load test - Google Patents

Abstract

(57) [Summary] [Purpose] For test pieces under steady stress,
Apply vibration at the same time. [Structure] A fixed clamp device 7 capable of gripping one end of a test piece 29 is fixed on a substrate 1, and the other end of the test piece 29 is gripped relative to the fixed clamp device 7 so that the test piece 29 can move toward and away from the fixed clamp device 7. The moving clamp device 1 is provided with a clamp device 17.
A jig having a restraint device 28 that movably guides 7 toward and away from the fixing device 7 and that can restrain at a desired position is mounted on the vibration table of the vibration tester, and the fixed clamp device 7 is provided. Between test piece 2 and moving clamp device 17
9 is stretched, and the restraint device 28 moves the moving clamp device 17
Is moved in a direction away from the fixed clamp device 7, the movable clamp device 17 is constrained to a predetermined position where a steady stress is generated in the test piece 29, and the vibration table of the vibration tester is vibrated.
The test piece 29 under the steady stress vibrates.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jig for composite load test.

[0002]

[Prior Art]

 For example, in order to rotate at high speed like a turbine blade or an air compressor blade of a jet engine, centrifugal force acts and tensile force acts on the blade itself, and strength evaluation of materials used for parts that are accompanied by vibration In the case of performing the test, a test piece of the material was conventionally subjected to a tensile tester and the two ends of the test piece were pulled away from each other to measure the breaking load of the test piece. After the vibration test, the test piece fixed to the shaking table was vibrated, and the test piece fixed to the shaking table was repeatedly subjected to a bending stress. Based on the strength B, the relationship between the stress amplitude σ ma and the average stress σ m represented by the Goodman diagram as shown by the broken line in FIG. 4 is obtained by calculation.

[0003]

[Problems to be solved by the device]

 However, in the load test described above, there was a problem that the stress acting on the parts of the actual machine (for example, the turbine rotor blade of the jet engine and the air compressor rotor blade) was not reproduced.

In view of the above-mentioned situation, the present invention attaches a jig capable of applying a tensile force to a test piece on a vibration tester to simultaneously vibrate the test piece on which steady stress is applied. The purpose of the present invention is to provide a jig for a combined load test that can be added.

[0005]

[Means for Solving the Problems]

 According to the present invention, a fixed clamp device capable of gripping one end of a test piece is fixed on a substrate that can be mounted on a vibration table of a vibration tester, and the other end of the test piece is fixed in relation to the fixed clamp device. The moving clamp device is provided with a movable clamp device that can be grasped and moved toward and away from the fixed device, and the movable clamp device can be a movable clamp device that guides the movable clamp device in a direction in which the movable clamp device is moved toward and away from the fixed device and can restrain the movable clamp device at an arbitrary position. The configuration is provided close to each other.

[0006]

[Action]

 Therefore, in the present invention, a jig for composite load test is mounted on the vibration table of the vibration tester via the substrate, and a test piece is stretched between the fixed clamp device and the movable clamp device, and the movable clamp device is mounted. While guiding the device with a restraint device, it moves in a direction away from the fixed clamp device to apply tensile force to the test piece and move it to a fixed position where steady stress is generated in the test piece. When the vibrating table is vibrated, vibration is applied to the test piece under steady stress.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an outline of a jig for composite load test of the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a view taken along the line III-III of FIG. is there.

A substrate 1 having a predetermined size that can be mounted on a vibration table of a vibration tester is formed, and the substrate 1 has a predetermined length and width and a width direction of one end of the substrate 1. A base plate 3 having flanges 2 that project to attach guide blocks 26 described later is provided on both sides of the base plate 3.

It has the same width as the base plate 3, slightly projects in the direction orthogonal to the surface near the tip of one side, and the tip side is chamfered at a predetermined angle and has a length over the entire width. A pair of hook blocks 5 having two protrusions 4 are provided, and one of the hook blocks 5 is provided with the tip 4 at the end on the side opposite to the flange 2 on the base plate 3 with the protrusion 4 facing upward. The fixing clamp device 7 is formed by fixing the plate 3 toward the center in the longitudinal direction, stacking another one of the hook blocks 5 on the hook block 5 so that the protrusions 4 face each other, and tightening the bolt 6. To do.

Further, a cubic fixed block 8 having substantially the same height as the fixed clamp device 7, a width narrower than the base plate 3 and a predetermined length is provided on the flange 2 so as to project on the center line in the width direction of the base plate 3. The base plate 3 is fixed at a predetermined position near the center in the longitudinal direction.

A guided portion 9 having substantially the same height as that of the fixed block 8 and extending rearward longer than the length of the fixed block 8 in parallel with each other at intervals such that they can fit in the width direction of the fixed block 8. , A hook portion 11 protruding forward from the lower end of the tip and provided with a protrusion 10 having substantially the same shape as the hook block 5 of the fixed clamp device 7 upward, and a key groove extending in the front-rear direction at the substantially central portion in the height direction on both sides in the width direction. 12 and a movable clamp body 13 having a width substantially the same as that of the base plate 3, and a hook block 14 of substantially the same shape as the hook block 5 of the fixed clamp device 7 and adapted to the hook portion 11. The protrusion 15 is overlapped with the protrusion 10 of the hook portion 11 so as to face it, and the bolt 16 is tightened and combined with the hook portion 11 to form the movable clamp device 17.

Further, the movable clamp body 13 has a width and a height adapted to the space between the guided portions 9, and the surface facing the fixed block 8 is an inclined surface 18 inclined at a predetermined angle and is anti-fixed. A rear block 20 having a flange 19 which can be attached to the rear end surface of the guided portion 9 by bolting is provided on the block 8 side.

Then, the guided portion 9 of the movable clamp body 13 is externally fitted to the fixed block 8 from the fixed clamp device 7 side, and the rear block 20 is attached to the rear end surface of the guided portion 9. Sometimes, a wedge-shaped space 21 is formed between the front inclined surface 18 of the rear block 20 and the rear surface of the fixed block 8, and a wedge-shaped stopper 22 that fits the space 21 is provided.

Furthermore, an outer surface in the width direction of the guided portion 9 of the base plate 3 and the movable clamp body 13, an inner surface 23 having a shape capable of being circumscribed with the upper surface of the guided portion 9, and a width of the guided portion 9. The key 24 that can be slid into the key grooves 12 provided on both side faces in the direction, and the leg 25 that can be mounted on the flange 2 of the base plate 3 have the length of the guided portion 9 of the movable clamp body 13. A guide block 26 having a suitable length is provided, and in order to push down the stopper 22, two bolts that can move in the vertical direction in parallel with each other with a predetermined space in the width direction at the center of the upper portion of the guide block 26. 27 is provided to form a restraint device 28. Reference numeral 29 is a test piece stretched between the fixed clamp device 7 and the movable clamp device 17, and a gauge (not shown) capable of monitoring steady stress is provided on the side surface thereof.

After mounting the substrate 1 on the vibration table of the vibration tester (not shown), the bolts 6 of the fixed clamp device 7 are loosened, and the ends of the protrusions 4 of the upper and lower hook blocks 5 are caught. Insert one end of the test piece 29 between the two hook blocks 5, tighten the bolt 6 to fix the end of the test piece 29, loosen the bolt 16 of the moving clamp device 17, and move it. The above-mentioned test is performed between the hook portion 11 and the hook block 15 so that the projection 10 of the hook portion 11 of the clamp body 13 and the projection 15 of the hook block 14 located above the hook portion 11 are hooked at their ends. The other end of the piece 29 is inserted, the bolt 16 is tightened to fix the end of the test piece 29, and the test piece 29 is stretched between the fixed clamp device 7 and the movable clamp device 17.

After that, the bolts 27 of the guide block 26 are tightened, and the stopper 22 is forcibly pushed into the wedge-shaped space 21 formed between the fixed block 8 and the rear block 20, so that the rear block 20 is interposed. The moving block main body 13 is moved in the direction away from the fixed block 8 to apply a tensile force to the test piece 29. The bolt 27 is tightened while monitoring the steady stress by a gauge (not shown) provided on the side of the test piece 29, and when the predetermined steady stress is reached, the tightening of the bolt 27 is stopped and the moving clamp The device 17 is restrained in its position.

After that, by vibrating the vibration table of the vibration tester, vibration is applied to the test piece 29 on which the steady stress acts.

According to the composite load / load test jig of the present embodiment, the composite load / load test jig capable of applying a tensile force to the test piece 29 can be attached to the vibration table of the vibration tester. Since it is formed, it is possible to apply vibration to the test piece 29 on which the steady stress is applied, and it is possible to obtain an arbitrary steady stress σm that cannot be obtained from the conventional Gutman diagram shown by the solid line in FIG. It is possible to obtain the stress amplitude σma with respect to, and thus the stress acting on the parts of the actual machine (for example, the turbine blade of a jet engine or the air compressor blade) can be reproduced.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0021]

[Effect of the device]

 According to the compound load test jig of the present invention, the test piece is stretched between the fixed clamp device and the movable clamp device, and the movable clamp device is moved in the direction away from the fixed clamp device. Since a composite load test jig that can apply tensile force to the test piece was provided and the composite load test jig was formed so that it could be attached to the vibration table of the vibration tester via the substrate, It is possible to add vibration to the stressed test piece, and it is possible to achieve an excellent effect of being able to reproduce the stress acting on components such as the turbine blade of a jet engine and the air compressor blade.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a jig for composite load test of the present invention.

2 is a view taken along the line II-II of FIG.

FIG. 3 is a view on arrow III-III in FIG.

FIG. 4 is a Goodman diagram showing the relationship between stress amplitude and average stress.

[Explanation of symbols]

 1 substrate 7 fixed clamp device 17 moving clamp device 28 restraint device 29 test piece

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location G01N 3/08 7414-2J

Claims (1)

[Scope of utility model registration request] 1. A fixed clamp device capable of gripping one end of a test piece is fixed on a substrate that can be mounted on a vibration table of a vibration tester, and the other end of the test piece is opposed to the fixed clamp device. A movable clamp device capable of grasping and moving away from the movable clamp device is provided, and the movable clamp device is movably guided in a direction in which the movable clamp device is moved toward and away from the fixed device and a restraint device capable of restraining the movable clamp device at an arbitrary position is close to the movable clamp device. A jig for combined load test, which is provided by