Natural exposure experimental device, system and method for components under variable amplitude load

Abstract

The invention relates to a natural exposure experimental device, system and method for components under variable amplitude load. The natural exposure experimental device for components under variableamplitude load comprises a plurality of strip-shaped test pieces, two ground beams arranged in parallel, a loading water tank and a control device, wherein the plurality of test pieces are placed on the two ground beams, the distance between the two ground beams is adapted to the length of the test pieces, a digital display strain gauge and a displacement meter are arranged in the middle of the bottom of the test pieces, the loading water tank is disposed on the top of the test pieces, two parallel loading heads are arranged between the loading water tank and the test pieces, a liquid level sensor is arranged at the bottom of the inner side of the loading water tank, the water tank is provided with an inlet pipe and an outlet pipe, and the natural exposure experimental device further comprises a water storage device, a controller, a water supply pump, a drainage pump, a main inlet pipe and a main outlet pipe. The natural exposure experimental device for components under variable amplitude load provided by the invention can realize the natural exposure experiment of the components under the coupling / co-action of various environments and variable amplitude loads, and has good versatility and wide application range.

Description

technical field [0001] The invention relates to the field of material and structural mechanics experiments, in particular to an experimental device, system and method for natural exposure of components under variable amplitude loads. Background technique [0002] Major equipment or major engineering structures in the fields of aerospace, land transportation, civil engineering, ships, ocean engineering, water conservancy and hydropower, ports, wind power generation, construction machinery, etc., often bear external loads that vary with time and space even random loads. For the anti-fatigue / durability design and safety evaluation of these major equipment and major engineering structures, most of the experimental data currently based are from constant-amplitude fatigue acceleration experiments of indoor materials (small specimens) and a very small number of variable-amplitude loads. Accelerate experiments. These experimental conditions (environment and load) are obviously qui...

AI Technical Summary

Problems solved by technology

However, carrying out natural exposure experiments of structures or components under variable amplitude loads faces the following main difficulties: 1) It is difficult to set, apply and precisely control variable amplitude loads in long-term exposure experiments

For the long-term, continuous, precise application and control of variable amplitude loads in natural exposure experiments, there is no good method at present; 2) The natural exposure experimental devices and methods of structures or components under variable amplitude loads have not been reported, but can be applied to The natural exposure test methods and devices of structures or components under multi-environment and multi-specimen variable amplitude loads are even more unheard of; 3) It is difficult to continuously and accurately test and collect experimental data under the coupling / joint action of natural exposure environments and variable amplitude loads

The static deformation of materials or small specimens in natural exposure experiments reported so far is tested by strain gauges, etc., but the test method using strain gauges is difficult to do because of its short service life, environmental influences, and difficult safeguards such as electricity. to long-term continuous testing and collection; 4) long-term operational difficulties in experimental sites, experimental conditions and devices, etc.

The cycle of natural exposure experiments generally takes decades or even hundreds of years. In such a long cycle, maintaining the set experimental conditions (environment, force, etc.), ensuring the function and stability of the experimental device, maintaining the experimental site, etc. Extremely difficult; 5) In a natural exposure environment, the stress and deformation test methods of structures or components (specimens) under variable amplitude loads need to be improved

On the one hand, the current test methods cannot adapt to the test of the deformation and force changes of the specimens caused by the changes in the environment, and can neither capture the deformation and stress of the specimens as the environment changes in a complete, real-time, and high-precision manner. And changing data, it is difficult to accurately measure the deformation of the specimen at the moment of drastic load changes

On the other hand, the previous natural exposure experimental devices cannot carry out natural exposure experiments under the same environment and load on multiple or a batch of specimens at the same time, which is not conducive to the statistical analysis of their long-term mechanical properties

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