Ultra-high-temperature strain field-temperature field synchronous measurement system and measurement method based on ultraviolet imaging

Abstract

The invention relates to an ultra-high-temperature strain field-temperature field synchronous measurement system and measurement method based on ultraviolet imaging. The strain field-temperature fieldsynchronous measurement system comprises an ultraviolet camera (1), a lens (2), a coaxial ultraviolet light source (3), a narrow-band-pass filter (4) corresponding to the wavelength of the ultraviolet light source, and a computer (6) for processing an image to obtain a strain field-temperature field. Before a strain field-temperature field is measured, a high-temperature-resistant speckle (9) ismanufactured on the surface of a test piece (10); a high-temperature mechanical testing machine is used for applying force and thermal load to the tested piece; the coaxial ultraviolet light is adopted for active illumination of the test piece; the ultra-high-temperature strain field-temperature field synchronous measurement system based on ultraviolet imaging is used for collecting surface imagesof the test piece; and a digital image correlation method and a system calibrated by a blackbody furnace in advance are used for measuring the strain field-temperature field of the surface of the test piece in a high-precision millimeter-to-micron view field mode. The principle is simple, the structure is compact, and the strain field-temperature field of the surface of the test piece in the environment from the room temperature to the 3273K ultrahigh temperature is synchronously measured in a high-precision mode through cooperation of the high-temperature mechanical test device.

Description

technical field [0001] The invention relates to the field of experimental solid mechanics, especially the full-field strain field-temperature constant synchronous measurement method under the coupling of force and heat, which is applied to ultra-high temperature strain in the fields of aerospace, engine hot-end parts superalloys, ceramic matrix composite materials, etc. Field-temperature field simultaneous measurement. Background technique [0002] As key high-temperature structural materials, superalloys, ceramics, and ceramic matrix composites are more widely used in aero-engines, firepower, and nuclear power plants. Due to serving in the extreme environment of heat and force coupling, this extreme high temperature will reduce the strength limit of the material and the bearing capacity of the structure, and cause thermal deformation of the structure and destroy the safety of the structure. Therefore, measuring and analyzing the change of high-temperature performance param...

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Problems solved by technology

[0007] In order to solve the problem existing in the prior art that cannot meet the requirement of ultra-high temperature strain field-temperature field synchronous measurement, the present invention proposes an ultra-high temperature strain field-temperature field synchronous measurement system and measurement method based on ultraviolet imaging

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