Strain measurement wire with two-dimensional code marks at two ends

Abstract

The invention belongs to the field of structural strain measurement of engineering mechanics and provides a strain measurement wire with two-dimensional code marks at both ends. One end of the strain measuring wire is connected to the strain gauge, and the strain gauge is on the test piece 1, and there is a two-dimensional code mark near the strain gauge, and the two-dimensional code mark has a corresponding relationship with the number of the strain measuring point; The other end is connected to the resistance strain gauge, and the end close to the resistance strain gauge has another two-dimensional code mark, and the two-dimensional code mark is corresponding to the measurement port of the resistance strain gauge. The present invention can improve the efficiency and accuracy of this type of strain measurement experiment, and make the strain gauge and the measurement port correspond efficiently and accurately in the large-scale structure strain measurement experiment of missile and heavy launch vehicle shell, thereby reducing the number of ports in the wiring process. Recorded workload.

Description

technical field [0001] The invention relates to the field of structural strain measurement of engineering mechanics, and proposes a strain measurement wire with two-dimensional code marks at both ends. Background technique [0002] Generally, an elastic object will produce a certain deformation under the action of external force, and the degree of deformation is called strain. There are normal strain (linear strain), shear strain (angular strain) and volume strain. Among them, the positive strain formula is ε=ΔL / L, where L is the length before deformation, and ΔL is the elongation after deformation. [0003] At present, the electrical measurement method is widely used in the strain measurement method. The electrical measurement method utilizes the principle that the resistance of a metal resistance wire will change when it is stretched or compressed. The resistance wire can be made into a resistance strain gauge by winding the resistance wire back and forth into a special...

AI Technical Summary

Problems solved by technology

However, based on the country's increasing demand for the development of large-scale structures for missiles and heavy-duty launch vehicle shells, the widespread use of large-scale structures in engineering problems, and the increasingly complex engineering problems, the number of strain measurement points in current structural strain measurement experiments has also increased greatly, often as many as This leads to too many connecting wires between the resistance strain gauge and the measurement port of the resistance strain gauge, which makes the corresponding relationship between the strain measurement point and the resistance strain gauge port very complicated. It is not realistic and efficient to obtain the corresponding relationship between the resistance strain gauges at the two ends of the connecting wire and the resistance strain gauge ports, and the risk of error in this operation is very high

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