JPH0564743U - Thermocouple mounting jig - Google Patents

Abstract

(57) [Summary] [Objective] To provide a jig for mounting a thermocouple on a test portion of a test piece in a high temperature fatigue test. [Structure] A holder 2 is detachably attached to one end of a test piece 1, an arm 4 is rotatably attached to the holder 2, and a holding metal fitting 7 for holding a thermocouple 6 is attached to a free end of the arm 4, and a spring is attached. Since the thermocouple 6 can be brought into close contact with the test portion 1a of the test piece 1 by pulling the arm 4 with the body 8, it is possible to correctly evaluate the high temperature fatigue characteristics of the test piece.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jig for mounting a thermocouple on a test portion of a test piece in a high temperature fatigue test.

[0002]

[Prior Art]

 Conventionally, when measuring the temperature of a test piece for repeatedly examining fatigue properties under high temperature, the thermocouple is tied to the test piece with a strip or other material, or spot welding is performed on the surface of the test piece. It was general that the method of fixing by fixing was adopted.

[0003]

[Problems to be solved by the device]

 However, when a fatigue test is performed by binding a thermocouple to a test piece with a strip and repeatedly applying a load at high temperature, a large tensile stress acts in the axial direction of the test piece, resulting in a thin test piece. There is a problem that the tied material often becomes loose, and as a result, the thermocouple moves away from the surface of the test piece and its temperature cannot be accurately measured.

Further, in the method of spot welding the thermocouple to the surface of the test piece, the thermocouple does not separate from the surface of the test piece even if the test piece is largely deformed. As a result, there is a problem that it becomes extremely hard and fatigue cracks occur from that part, making it difficult to correctly evaluate the fatigue life of the material. The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a thermocouple mounting jig that can correctly evaluate the high temperature fatigue fracture characteristics of a test piece.

[0005]

[Means for Solving the Problems]

 The present invention is a jig for mounting a thermocouple on a test portion of a test piece in a high temperature fatigue test, and includes a holder detachably attached to one end of the test piece, and an arm rotatably attached to the holder. A holding metal fitting attached to the free end of the arm for holding the thermocouple, and a spring body attached between the arm and the holder to adhere the thermocouple to the test site. It is a characteristic thermocouple mounting jig.

[0006]

[Work]

 According to the present invention, the thermocouple is brought into close contact with the surface of the test piece by using the spring body, so that even if the test piece is largely deformed, the thermocouple can always be pressed against the surface of the test piece according to the deformation. Yes, this allows accurate temperature measurements.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a side view thereof. In the figure, 1 is, for example, a round bar test piece, and a test portion 1a is formed between the grip portions 1b. Reference numeral 2 denotes an annular holder, which is detachably attached to one outer peripheral surface of the grip portion 1b of the test piece 1 with a fixing bolt 3. An arm 4 is rotatably attached to the holder 2 via a pin 5. Reference numeral 6 denotes a metal fitting for holding the thermocouple 7, which is tiltably attached to the free end of the arm 4 via a pin 8. Reference numeral 9 is a spring body having one end attached to the holder 2 and the other end attached to the arm 4 to urge the arm 4.

By configuring the thermocouple mounting jig in this way, the thermocouple 6 can be pressed against the test site 1a of the test piece 1 by the urging force of the spring body 8. Even if the thermocouple 6 is largely deformed by the load, the thermocouple 6 can always be brought into close contact with the test portion 1a without being separated from the surface thereof. Although the case where the test piece 1 is a round bar has been described in the above embodiment, the present invention is not limited to this, and may be applied to a test piece having a rectangular cross section or a flat plate-like test piece, for example. Needless to say.

[0009]

[Effect of the device]

 According to the present invention, the thermocouple is brought into close contact with the surface of the test piece by using the spring body, so that even if the test piece is largely deformed, the thermocouple can always be pressed against the surface of the test piece according to the deformation. Yes, this allows for accurate temperature measurements and therefore the correct assessment of the fatigue life of the specimen.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

[Explanation of symbols]

 1 Test piece 1a Test site 2 Holder 4 Arm 6 Holding metal 7 Thermocouple 9 Spring body

Claims (1)

[Scope of utility model registration request] 1. A jig for mounting a thermocouple on a test portion of a test piece in a high temperature fatigue test, the holder being detachably attached to one end of the test piece, and an arm rotatably attached to the holder. A holding metal fitting attached to the free end of the arm to hold the thermocouple, and a spring body attached between the arm and the holder to bring the thermocouple into close contact with the test site. A thermocouple mounting jig.