Ultrahigh temperature multi-dimensional multi-functional strain measurement system based on ultraviolet imaging DIC and measurement method

Abstract

The invention relates to an ultrahigh temperature multi-dimensional multi-functional strain measurement system based on an ultraviolet imaging digital-image-correlation(DIC) method and measurement method. The strain measurement system comprises ultraviolet cameras (1,5), coaxial long-working distance microscopic lenses (7,15), a monochromatic source (2), narrowband pass filters (6,16) having wavelengths corresponding to that of the monochromatic source, and high temperature speckles or friction scratch spots on a surface of a test piece. A high temperature image observation furnace and a matched high temperature mechanical testing device are used to apply force and thermal load on the test piece having a rectangular cross section or a cylindrical surface. A coaxial ultraviolet light active illumination test piece is adopted, and the ultrahigh temperature multi-dimensional multi-functional strain measurement system based on the ultraviolet imaging digital-image-correlation(DIC) method is used to acquire the surface image of the test piece. By adopting the DIC method, the two-dimensional or three-dimensional measurement of the high-precision real-time millimeter to micron-level visual field of the strain of the surface of the test piece is carried out. A principle is simple, and a structure is compact. By adopting cooperation between a high temperature image furnace and a high temperature stretching device, the real-time, high-precision measurement of the deformation of the surface of the test piece and the mechanical performance of the test piece in environment at a temperature in a range from indoor temperature to ultrahigh temperature of 2000 DEGC is carried out.

Description

technical field [0001] The invention relates to the field of experimental solid mechanics, especially a two-dimensional and three-dimensional deformation measurement method for the whole field under force and thermal coupling, which is applied to ultra-high temperature displacement and strain measurement in various fields such as aerospace and high-temperature composite materials. Background technique [0002] Non-contact, high-precision measurement of the full-field deformation of aerospace materials and structures, as well as various high-temperature alloys and high-temperature ceramic composites caused by force and thermal loads in high-temperature environments. For the safety design, reliability assessment and use of these materials Life prediction is of great significance. At present, there are mainly two types of methods for strain measurement under ultra-high temperature conditions: contact method and non-contact method. Traditional contact methods usually use contac...

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Problems solved by technology

[0004] In order to solve the problem that the existing technology cannot meet the requirements of ultra-high temperature multi-scale multi-functional strain measurement, the present invention proposes an ultra-high temperature multi-scale multi-functional strain measurement system and measurement method based on ultraviolet imaging DIC, which can withstand extremely high temperature, high calculation speed and high precision

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