Clamp for high-temperature high-cycle fatigue test of metal plate-shaped sample

Abstract

The invention discloses a clamp for a high-temperature high-cycle fatigue test of a metal plate-shaped sample. The clamp is composed of a clamping head, a clamping head supporting rod, a fastening ring, a standby fastening ring and a base. The clamping head is provided with a clamping head clamping groove to be matched and clamped with a clamping tenon on the inner concave cambered surface of the clamping head supporting rod, the fastening ring is installed at the upper end of the clamping head supporting rod, and the clamping head supporting rod is connected with the base and locked through the standby fastening ring. The clamping head supporting rod is provided with an expanding wrench, a sample is placed at the central position of the clamping head through the expanding wrench, threads of both a threaded hole of the fastening ring and a bolt are coated with high temperature grease, and the sample is fastened through a wrench. The base is provided with a through water outlet to be connected with a water circulation cooling system, so that a good cooling effect can be guaranteed, and the cost of manufacturing a water cooled jacket can be reduced. The clamp is simple in structure, a clamping method is convenient to operate, an axial fatigue test of the plate-shaped sample under the test conditions of a maximum high temperature environment of 1100 DEG C, a maximum axial load of 600 MPa and a frequency range of 90-110 Hz can be guaranteed, and the clamp has good reliability and clamping performance.

Description

technical field [0001] The invention relates to a high-temperature high-cycle fatigue test clamping device for material testing, in particular to a high-temperature high-cycle fatigue test fixture for a metal plate sample. Background technique [0002] Existing published literature, "Research on High Cycle Fatigue Properties of DZ468 Alloy" ("Acta Metals", 2010, No. 6, pp. 708-714) and "High Cycle Fatigue Behavior of DD98M Nickel-based Single Crystal Superalloy at 900°C" (" Acta Metall Sinica, 2012, No. 2, pp. 170-175") introduced a test method for testing the high-temperature high-cycle fatigue performance of metals, that is, using rod-shaped specimens connected to the PLG-100 high-frequency fatigue testing machine. The test method described in the literature is the method used in the fatigue test of the traditional bar-shaped sample, and the fatigue test technology of the bar-shaped sample has been matured at present. However, the disadvantage of the rod-shaped sample is ...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the rod sample is that due to the shape limitation, some special structural parts cannot be simulated, and the rod sample will cause material waste for metal materials with a small original ingot size

[0003] Invention patent 201410100602.4 proposes a fixture for fatigue testing of flat specimens. The main principle is to perform fatigue tests by clamping and fixing the specimen with wedge-shaped blocks. Although the fixture can be used for clamping plate specimens, the The clamping effect is limited. When the temperature rises to about 600°C, due to the stress relaxation caused by metal creep at high temperature, the clamp and the specimen will loosen when the load exceeds 200MPa and the high-frequency oscillation environment of 90Hz-110Hz causes clamping. Sustained failure, unable to meet the test requirements

At present, the vibration frequency of the high-cycle fatigue test equipment is 60Hz-180Hz, and the test usually uses a smooth round bar sample with threads, while the high-frequency test for plate samples is still in a blank state

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