A Method of Heterotopic Digital Volume Correlation Based on Image Registration
A digital volume correlation and image registration technology, applied in the field of ectopic digital volume correlation, can solve the problems of difficulty in in-situ online experiments, temperature deformation, etc., and achieve the effect of easy implementation and expansion of application space.
Inactive Publication Date: 2015-10-07
SOUTHEAST UNIV
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Problems solved by technology
Although there are some in-situ loading tools, such as Chinese invention patent ZL201110163456.6 (in-situ loading device based on X-ray tomography), they can only be used for simple loading after all.
Moreover, in-situ online experiments on some deformation problems are very difficult, such as impact deformation, temperature deformation, chemical deformation, etc., which are difficult to perform in situ in 3D imaging equipment
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[0027] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0028] Such as figure 1 As shown, the heterotopic digital volume correlation method based on image registration of the present invention comprises the following steps:
[0029] Step 1, the sample II to be tested and the marker I for registration are fixed on a rigid substrate III to obtain state (1); (the marker I for registration can adopt the same material as the sample II to be tested, and the rigid substrate III must have sufficient rigidity to ensure that it cannot be deformed in subsequent steps, and the fixation between the sample II to be tested, the registration marker I and the rigid matrix III is not loose and deformed;)
[0030] Step 2, set the experimental parameters, use the X-ray tomography method to perform the first X three-dimensional imaging of the test sample II, the registration marker I and the rigid m...
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The invention discloses an ectopic digital volume correlation method based on image registration. The ectopic digital volume correlation method comprises the following steps: fixing a sample and a marker for registration on a rigid base body; carrying out first-time three-dimensional imaging on the marker for the registration and the whole body of the rigid base body to obtain a three-dimensional image datum G1 (x, y, z) which is obtained by the first-time three-dimensional imaging; carrying out ectopic deformation on the sample and keeping that the marker for the registration and the rigid base body do not deform; carrying out second-time three-dimensional imaging on an ectopically-deform sample and the marker for the registration and the whole body of the rigid base body which do not deform to obtain three-dimensional image datum G2 (x, y, z) which is obtained by the second-time three-dimensional imaging; registering the three-dimensional image data G1 (x, y, z) and G2 (x, y, z) of the marker for the registration to obtain six rigid body freedoms of motion; calculating the data G1 (x, y, z) by freedoms obtained in the step 5 to obtained a simulated three-dimensional image datum G3 (x, y, z); and carrying out normal position digital volume correlation calculation on the G2 (x, y, z) and the G3 (x, y, z) to obtain three-dimensional displacement fields before and after the sample deforms.
Description
technical field [0001] The invention relates to an image registration-based heterogeneous digital volume correlation method, which belongs to the field of optical measurement experiment mechanics. Background technique [0002] The digital volume correlation method (English full name: Digital Volume Correlation, abbreviation: DVC) was first developed by B.K.Bay et al. (Bay B K, Smith T S, Fyherie D P, et al. Digital volume correlation: Three-dimensional strain) from the University of California in 1999. mapping using X-ray tomography [J]. Experimental Mechanics, 1999, 39 (3): 217-226) was invented on the basis of the traditional digital image correlation method DIC (English full name: Digital Image Correlation, abbreviation: DIC). It obtains the displacement value of each point in the sample by performing correlation calculation on the three-dimensional digital images collected before and after deformation, that is, the three-dimensional displacement field; under the premise ...
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IPC IPC(8): G01N3/00G01N33/00
Inventor 万克树杨鹏
Owner SOUTHEAST UNIV