Constant-load tensile test device

Abstract

The invention belongs to the technical field of metal material test equipment and relates to a constant-load tensile test device. The constant-load tensile test device is characterized in that a rectangular cavity is formed in a force-bearing framework with A, B, C and D side surfaces, wherein circular-arc-shaped grooves capable of dispersing load on four right angles of the rectangular cavity are formed in four vertexes of the rectangular cavity; a sleeve type upper chuck is arranged on a perpendicular central axis at the inner side of an upper beam of the force-bearing framework; a threaded end of the upper chuck penetrates through the force-bearing framework and is provided with an insulating gasket, a loading spring and a loading nut in a sleeved mode; a lower chuck of a sleeve structure is arranged on a perpendicular central axis at the inner side of a lower beam of the force-bearing framework; a threaded end of the lower chuck is fixedly connected with the force-bearing framework; U-shaped slot structures are arranged at the clamping ends of the upper chuck and the lower chuck respectively; insulating gaskets are arranged in the centers at the two sides of each U-shaped slot structure. The constant-load tensile test device is small and light, easy to carry, assemble and fix, freely spliced to realize batch test of a tested part, safe and reliable, simple and convenient in a manual loading mode, and accurate and constant in loaded load.

Description

Technical field: [0001] The invention belongs to the technical field of metal material test equipment, and relates to a constant load tensile test device, which is suitable for batch testing and testing of metal materials in actual marine environments and laboratory simulated marine environments. Background technique: [0002] Corrosion of metal materials in the marine environment is quite serious, which makes marine engineering and equipment materials have a great risk of stress corrosion cracking under stress, and may even cause metal materials to suddenly Fractures, major safety accidents, and economic losses caused by corrosion in the world are as high as trillions of dollars every year; therefore, it is very important to accurately evaluate the safety of marine engineering and equipment materials under the synergistic effect of corrosion factors and stress states in the marine environment. Important; the current constant load stress corrosion test is realized by large-s...

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Problems solved by technology

[0002] Corrosion of metal materials in the marine environment is quite serious, which makes marine engineering and equipment materials have a great risk of stress corrosion cracking under stress, and may even cause metal materials to suddenly Fractures, major safety accidents, and economic losses caused by corrosion in the world are as high as trillions of dollars every year; therefore, it is very important to accurately evaluate the safety of marine engineering and equipment materials under the synergistic effect of corrosion factors and stress states in the marine environment. Important; the current constant load stress corrosion test is realized by large-scale special equipment, such as stress corrosion testing machine, universal testing machine, stress ring and spring device. Although this type of device can accurately measure the load, it is bulky, expensive and expensive. The stress corrosion test of a single specimen can only be carried out by professionals under laboratory conditions, and it is impossible to realize the batch test of multiple sets of specimens and the long-term exposure test in the actual marine environment

Chinese patent 201210222014.9 (application date July 2, 2012) discloses a high-temperature, high-pressure, constant-load stress corrosion test method and device. Constant load stress corrosion test under constant load. During the experiment, the metal material is subjected to the comprehensive action of constant stress, high temperature and high pressure gas phase, and liquid phase corrosion medium. The device has realized the miniaturization of the stress corrosion test device, but its preloading process requires the use of a tensile testing machine, which is inconvenient to operate, and no insulation measures are taken for the connection between the test piece and the clamping end , so that the test piece and the clamping end must use the same material, which limits the scope of use of the device; Chinese patent 201320180412.9 (application date April 11, 2013) discloses a portable axial tensile stress loading device, including a rectangular The load-bearing frame, the interior of the rectangular load-bearing frame is provided with more than one hollow structure arranged in parallel, and the hollow structure is equipped with slot holes symmetrically located on the upper and lower bottom central axes, the upper chuck is sleeved in the upper slot hole, and the lower slot hole A lower chuck is set in the middle sleeve, and one threaded end of the upper chuck passes through the slot hole above the frame to fit the loading nut, and the threaded end of the lower chuck passes through the slot hole below the frame to fit the lock nut; this device solves the problem of Accurate loading and simultaneous testing of multiple test pieces, but its frame structure is not disassembled, the loading method is complicated and cumbersome, it is impossible to realize the batch test of metal materials, and the test pieces are easy to fall off and lose after breaking; The constant load tensile test device for batch testing of metal materials under the actual marine environment and laboratory simulation conditions has great application prospects and social value

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