Ridge regression strain measurement method with initial value in digital image correlation

A digital image and strain measurement technology, which is applied in non-contact full-field strain measurement and experimental mechanics, can solve the problems of limited practical application, complex mathematical form, and error of displacement measurement results, so as to improve the level of strain detection and high detection accuracy , the effect of good robustness

Active Publication Date: 2021-10-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, in the actual DIC measurement process, due to many reasons such as noise and pixel interpolation errors, there are certain errors in the displacement measurement results.
When the strain is differentially calculated from the displacement measurement results, the error in the displacement field will be further amp

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  • Ridge regression strain measurement method with initial value in digital image correlation
  • Ridge regression strain measurement method with initial value in digital image correlation
  • Ridge regression strain measurement method with initial value in digital image correlation

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[0033] In order to make the object, technical solution and effect of the present invention clearer and clearer, the following examples are given to further describe the present invention in detail. It should be pointed out that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

[0034] For realizing the purpose of the present invention, the method concrete steps of the present invention are:

[0035] Step 1: Build a digital image correlation measurement system to obtain the reference image of the specimen before deformation and the deformed image after deformation;

[0036] Step 2: Divide the reference image into grid units, and record each unit and node number;

[0037] Step 3: Use unit nodes, unit edge 1 / 3, 2 / 3 points and unit center as unit feature points, use pixel interpolation to obtain the position coordinates of feature points, and use digital image correlation method to calculate the displa...

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Abstract

The invention discloses a ridge regression strain measurement method with an initial value in digital image correlation, and belongs to the fields of experimental mechanics, non-contact full-field strain measurement and digital image correlation, and the method comprises the steps: firstly, building a digital image correlation measurement system, and obtaining digital images before and after deformation of a test piece; dividing grid units and nodes of the image, selecting feature points in the units, and obtaining displacement and strain of the feature points through a digital image correlation method; calculating the average value of the strain of each feature point in the unit; selecting a displacement function type in the unit, performing ridge regression on the displacement field in the unit by taking the strain average value as an initial value, and fitting to obtain the displacement field in the unit; and interpolating the strain of each unit to obtain full-field strain. According to the invention, the strain measurement precision and robustness of a digital image correlation method can be improved.

Description

technical field [0001] The invention relates to experimental mechanics, non-contact full-field strain measurement and a digital image correlation method, in particular to a ridge regression strain measurement method with an initial value in the digital image correlation. Background technique [0002] In many fields such as aerospace and building bridges, ensuring structural reliability is always the top priority. With the development of science and technology, it has become an important goal of many scientists to control and repair structures before irreversible damage occurs. The measurement results of material response load characterization provided by experimental mechanics have rich guiding significance for perfecting design, improving structure and monitoring damage. Displacement and strain, as important parameters of experimental mechanics, play a pivotal role in analyzing the mechanical properties of models, verifying basic assumptions, and identifying features. In ...

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Application Information

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IPC IPC(8): G01B11/16G01N3/00
CPCG01B11/16G01N3/00
Inventor 熊克宋祥帆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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