Measuring method of dynamic stress field evolution law of complex heterogeneous structure

Abstract

The invention provides a measuring method of a dynamic stress field evolution law of a complex heterogeneous structure. A transparent photosensitive resin model of the complex heterogeneous structure is prepared by 3D (three-dimensional) printing technology to serve as a test piece, the test piece is placed in a light path of a circularly polarized light dark field and subjected to continuous stress loading and picture recording, a plurality of continuously changing full-field stress fringe gray images are acquired according to videos generated by picture recording, gray value change sequences of pixel points at positions in the images are acquired, finally, full-field fringe orders under continuous loading conditions are calculated according to the relation between gray values and the fringe orders, and full-field stress values under the continuous loading conditions are further calculated. Therefore, the global dynamic stress field evolution law of the complex heterogeneous structure subjected to high exterior load under fixed light field conditions can be extracted and quantified by the method.

Description

technical field [0001] The invention relates to the technical field of stress measurement, in particular to a method for measuring the evolution rule of a dynamic stress field of a complex heterogeneous structure. Background technique [0002] Accurately and intuitively displaying and characterizing the stress field evolution of complex heterogeneous materials such as rocks and concrete, as well as engineering structures, is the long-term goal pursued by scientists and engineers in many engineering technology fields, and it is also the basis and key to solving many practical engineering problems. [0003] The existing stress field measurement methods mainly include two aspects: experimental measurement and numerical simulation display. In terms of experimental measurement, it is mainly on-site monitoring, laboratory measurement and other methods, which mainly rely on sensors to measure local points, it is difficult to form the stress distribution of the whole field, and the ...

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Problems solved by technology

[0005] The invention provides a method for measuring the evolution law of the dynamic stress field of a complex heterogeneous structure, so as to solve the problem that the existing digital photoelasticity method cannot realize that the complex structure is continuously loaded with a relatively high external load under the condition of a fixed light field. The problem of global stress field extraction and quantification

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