Strain brick and preparation method thereof

Abstract

The invention discloses a strain brick suitable for a model test and a preparation method thereof. The strain brick comprises a strain brick matrix, a polyurethane plate and a strain gauge. A base material of the strain brick is a similar material in a model test, the similar material is poured on the surface of a measurement component, and after a certain strength is reached, a strain brick basebody is generated through cutting and can be perfectly attached to the surface of a complex measurement component. The cut polyurethane plates are pasted on the surface of the base body one by one, and the base body can be partially or completely wrapped according to test requirements. Finally, the strain gauges are installed on the polyurethane plate, and manufacturing of the strain brick is completed. The strain brick is attached to the surface of the complex measurement component to accurately measure the pressure of the component surface; the polyurethane plate partially wraps the strain brick base body so that the strength of the strain brick can be guaranteed, the influence of strain brick embedding on a model test can be reduced, the test error is reduced, and the measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of model tests, in particular to a strain brick and a preparation method thereof. Background technique [0002] With the rapid development of economic construction, my country's scientific research has made great progress, which has greatly accelerated my country's modernization process. As an important research method, model test can control the main parameters of the test object without being restricted by external conditions and natural conditions, and obtain test results with qualitative or quantitative nature. In the process of carrying out model tests, it is usually necessary to measure the stress state at a certain location inside the model. Currently, commonly used measuring elements include earth pressure cells and strain bricks. [0003] The earth pressure cell is a metal product. After being stressed, a plate-beam structure will be formed above the pressure cell, which will cause the measurement...

AI Technical Summary

Problems solved by technology

[0008] Most of the existing strain bricks are regular rectangles. In the model test, when it is necessary to test the normal pressure of the measuring member with irregular surface shape, the measurement result may deviate because the strain brick cannot fit well with the surface of the measuring member. True results, resulting in experimental errors;

[0009] (3) High production cost and long production cycle

For larger-sized strain bricks (such as 25mm×25mm), the central polyurethane solidification process is slow, which prolongs the production cycle of strain bricks

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