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Digital image correlation technical experimental device based on X-ray transmission imaging

A technology of digital images and related technologies, applied in measurement devices, using wave/particle radiation, and using radiation for material analysis, etc., can solve problems such as measurement errors, and achieve the effects of reliable optical speckle, uniform distribution, and high imaging quality.

Inactive Publication Date: 2018-01-26
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual erection of equipment, it is impossible to ensure that they are completely vertical, and the sample will inevitably be deformed during the loading process, causing off-plane displacement, which changes the object distance (the distance between the sample surface and the camera) , leading to changes in image magnification, causing additional compression and tension virtual strains, resulting in measurement errors

Method used

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  • Digital image correlation technical experimental device based on X-ray transmission imaging
  • Digital image correlation technical experimental device based on X-ray transmission imaging
  • Digital image correlation technical experimental device based on X-ray transmission imaging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Two dog bone-shaped aluminum samples with a thickness of 0.5 mm were cut, one of the samples was polished, immersed in hydrofluoric acid for 1 min, and then ultrasonically cleaned for 30 min to remove residual particles on the surface. The sample is only polished and not corroded. The effect of etching is to roughen the surface of the specimen, enabling it to produce X-ray spots on the XPCI image. Next, XPCI and scanning electron microscopy (SEM) were performed on the two samples to obtain original images, such as image 3 As shown, the XPCI image of the corroded sample ( image 3 (a)) Abundant X-ray spots appear on the surface, which is due to the roughening of the surface by corrosion, which produces subtle thickness differences in the transmission direction of X-rays; this feature is more prominent in the SEM image, from image 3 (b) It can be seen that the corroded aluminum surface has a rich microstructure. However, the uncorroded aluminum sample is r...

Embodiment 2

[0038] The experimental material is the AZ31 magnesium alloy in the rolled state. A thin sheet sample with a size of 2.6mm×2.0mm×1.0mm was prepared and polished, and then the prepared sample was subjected to quasi-static compression experiments under X-ray irradiation, and was analyzed by CCD The camera records the entire loading process, and some representative XPCI images of the sample before and during deformation are displayed on the Figure 5 (a). Figure 5 Time t0 in (a) is the image of the sample before deformation, and t1~t4 are the images of different deformation stages with the increase of the deformation amount, where the fixed compression direction of the right end of the sample is along the positive direction of the x-axis when loading.

[0039] From Figure 5 (a) It can be seen that there are abundant and clear X-ray spots on the XPCI image of the magnesium alloy sample, which is due to the existence of many second phases in the magnesium alloy itself, and the e...

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Abstract

The invention discloses a digital image correlation (DIC) technical experimental device based on X-ray transmission imaging. The experimental device includes an X-ray light source, a scintillator, a reflector, a CCD camera and a computer. The X-ray generated by the X-ray light source passes through a test sample and carries the internal information of the test sample to the scintillator, the scintillator transforms the X-ray into visible light and transmits the light to the CCD camera, the CCD camera is connected to the computer, a phase contrast image of the test sample can be acquired through image acquisition software in the computer, and the computer processes the phase contrast image by DIC analysis method to acquire the displacement field and strain field of the test sample. The experimental device provided by the invention applies X-ray imaging technology to the traditional DIC experimental method, can represent the mechanical behavior of the material during loading to acquire full-field displacement and strain distribution, can achieve higher imaging quality, and is suitable for representation of microscale material deformation. In addition, with the help of X-ray penetration power, the XPCI (X-ray phase contrast imaging) image can also provide some additional material internal deformation information.

Description

technical field [0001] The invention belongs to the technical field of digital image correlation, in particular to an experimental device for digital image correlation technology based on X-ray transmission imaging. Background technique [0002] Strain and displacement are very critical parameters in the study of solid deformation and fracture mechanics. However, it is always difficult for researchers to choose traditional methods and techniques to measure these parameters in experiments, because they always have to balance accuracy and simplicity. and balance between cost and other factors. Digital Imaging Correlation (DIC) is a non-contact optical measurement method developed in the early 1980s. It is very suitable for the study of crack propagation and material deformation. Accurate and easy-to-operate research method. Since this method does not require complex optical systems, it can be easily measured. Furthermore, unlike other methods utilizing light wave interferen...

Claims

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Application Information

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IPC IPC(8): G01N23/04G01B15/06G01B15/00
Inventor 罗胜年宋广军范端卢磊别必雄
Owner SOUTHWEST JIAOTONG UNIV
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