A continuous loading indentation type stress corrosion test machine and test method

Abstract

The invention relates to a continuous loading indentation stress corrosion tester and a test method therefor. The continuous loading indentation stress corrosion tester is used for researching hysteresis growth and related mechanical behaviors of material cracks and especially for researching rules of the influence produced by different stresses, environmental mediums and temperatures on crack nucleation and growth, and clearly expounds the rule and the mechanism of material invalidation under the stress-environment coupling condition. The test method comprises the following steps of 1, through contact between a pressure head and a test sample under a certain load, determining fracture toughness of a brittle material, and observing the influence produced by the environment on crack growth under the continuous loading condition, 2, determining threshold stress of hysteresis growth of cracks of the brittle material by radial cracks having certain length under a certain environmental condition, 3, in a solution medium, researching crack growth of a toughness material by indentation, and 4, observing a change of electrochemical parameters in crack growth by connection with an electrochemical workstation. The continuous loading indentation stress corrosion tester can be operated conveniently and simply, realize control of an experimental environment and a load, is especially suitable for long-term loading in different environments, has a simple structure, is convenient for operation and has a large application prospect.

Description

technical field [0001] The invention is an experimental device for studying the hysteresis expansion of material cracks and related mechanical behaviors. It is especially suitable for long-term continuous loading in different environments. It can also observe the changes in the electrochemical parameters of the sample as the cracks expand during the loading process, and then reflect the resistance of the material. corrosion performance. Background technique [0002] In practical applications, poor toughness limits the application of brittle materials (ceramics, hard films), such as surface coatings, especially the surface coating system used to improve the hardness and wear resistance of the material surface and provide special functions, compared to Most of the matrix materials are brittle layers. Affected by the preparation process, use and storage environment (such as temperature gradient, humidity, contact and friction and wear, etc.), microcracks often occur on the sur...

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Problems solved by technology

CN200410020516.9 proposes a continuously loaded Vickers hardness tester, CN201210240785.0 proposes a height-adjustable fixture for a hardness tester, and CN201010161619.2 proposes a thin film based on a nanoindentation continuous stiffness curve and an inaccessible interface Physical property test method, but the above-mentioned patents cannot be tested under multiple coupling factors such as temperature, continuous load, solution medium, etc., which cannot meet the experimental requirements we need, so there is an urgent need for a continuous loading multi-function in different environments Indentation stress corrosion test machine

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