Manufacturing method of high-temperature speckle

Abstract

The invention relates to a manufacturing method of high-temperature speckles, which belongs to the technical fields of optical device manufacture and photomechanics. The invention has the technical characteristic that high-temperature resistant speckles are manufactured on the surface of a material by utilizing a chemical reaction method. Silver speckles can be generated on the surface of the material put into solution which is prepared from silver nitrate powder, ammonia water, glucose powder and purified water according to a proper proportion in a certain temperature environment. The speckles can resist about 900 DEG C of temperature and can be matched with a digital image correlation method to finish the optical measurement of mechanical performance in multiple complicated loaded states, such as heat shock, fracture and the like of the material in a high-temperature environment. The invention has novel thought, simple and flexible operation and strong feasibility.

Description

technical field [0001] The invention relates to a high-temperature speckle manufacturing method, which belongs to the technical fields of optical device manufacturing and photometric mechanics. Background technique [0002] In recent years, the real mechanical properties of materials under high temperature environment have become a very concerned issue in the design of aerospace structures and a key topic in the research of solid mechanics and materials science. In the field of photomechanics technology, speckle is an important carrier for digital image correlation method to measure the deformation of the object surface. The speckle on the surface of the measured object through transfer or direct etching is an important carrier to reflect the deformation information of the object surface. At present, the commonly used speckle production methods are mostly artificial speckle production methods, such as spray paint method and engraved cross method. Due to the physical propert...

AI Technical Summary

Problems solved by technology

Due to the physical properties of conventional decorative paints, the spraying method cannot withstand high temperatures. When the temperature is lower than 200°C, the decorative paints will start to change color and become brittle, and even peel off and delaminate. Not only will they become loose with the material, but the measurement results will not reflect the material surface correctly. Deformation information, and the volatilization of decorative paint due to heating will cause violent and unpleasant gas, which will cause great harm to the health of experimenters; on the one hand, the method of engraving a cross on the surface of the material can obtain very limited displacement information, and the accuracy is far inferior to that of spray paint. On the other hand, because the engraved cross itself will damage the material and produce pre-cracks, the real mechanical properties of the original material will inevitably be affected, and in some cases this effect cannot be ignored

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