Coordinate measuring machine-strain joint measuring method for large-scale component

Abstract

The present invention belongs to the strain measurement field in engineering mechanics and provides a coordinate measuring machine-strain joint measuring method for a large-scale component. The method includes the following steps that: corresponding relations between static strain gauge ports T and strain measurement values E, corresponding relationships between line end identification codes M and resistance strain gauge measuring ports T, corresponding relationships between strain measuring points A and the line end identification codes M, and corresponding relationships between measuring point coordinate measuring machine coordinates G and the strain measuring points A are obtained; the obtained corresponding relationships are merged, so that a measuring point comprehensive information database can be obtained; and stress and strain predictive value of an area to be tested is obtained through using the measuring point comprehensive information database. With the method of the invention adopted, real-time single-point calling and multi-point area interpolation can be realized. The method can be applied to experimental sites of large-scale components such as missiles and heavy carrier rockets. According to the method, the strain measuring point comprehensive information database is constructed, so that the change condition of a strain predictive value at a specific position of a structure can be mastered in real time, and therefore, interactive display and processing of data can be realized in a measurement site.

Description

technical field [0001] The invention belongs to the strain measurement field of engineering mechanics, and relates to a three-coordinate-strain joint measurement method for large components. 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] In the actual experiment, the stress cannot be measured, the strain is measured first, and then the stress field is calculated according to Hooke's law ε=σ / E. The strain measurement method adopted in the present invention is strain gauge measurement. However, it is difficult to monitor the construction in real time during the experiment. [0004] However, the real-time monitori...

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Problems solved by technology

The spatial coordinate information of a specific position is obtained during the experiment, and the established comprehensive information database of measuring points is used to output the strain measurement value corresponding to the specific position, so as to solve the problem that the strain of a certain position cannot be monitored in real time during the strain measurement of large components

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