Hello everyone
I am looking forward to carrying out experiments using DIC to detect cracks widths, spacing, deflection of the beam, and strain of reinforced concrete beams under load. Being a novice in photography, I have gathered some of the basics of DIC, but I still have some doubts about the procedure. Can somebody please help? The following are my questions.
1. How to estimate the required resolution of the camera based on the experimental requirements?
2.How to find out the camera sensor to specimen distance?
3. How to get an idea of the perfect lighting required?
It would be really great if you can share your experiences and challenges encountered while using DIC in the field of reinforced concrete structures design.
Thank you.
Best Regards
Naveen
Hi,
Not an expert in structural buildings but as an optical scientist, your question sent me down the rabbit hole and I found this possible useful paper. Good Luck!
Cheers,
Brian
Article Application of Digital Image Correlation (DIC) Method for Ro...
Hi Naveen,
It´s hard to say a specific setup, but you can try to set it backwards. DIC relies on pores and imperfections of a few mm to do the analysis. It means that each of those should be covered by some pixels. This determines the pixel size, which in your case should be maybe 0.5 mm/pixel. It means that with a pixel width of the picture of 2500 pixels your imaged area will have a width of around 1.25 m. The distance between the camera and the sample will depend on the focus, just place it in aposition capable to photograph this area. And finally, the lighting should be enough to avoid shadows and to see clearly those features. Remember that always everything is designed around those features.
Luis
Dear Brian W. Taylor
Thank you very much for the link. It really helps.
Naveen
Dear Luis Saucedo Mora
The explanation was really what I was looking for, I hope this will help in the DIC setup. Thank you very much.
Naveen
I am not sure about reinforced concrete structures. However, you can see an interesting analysis using the DIC technique in this article:
Article Assessment of Notch Effect Based on Finite Element Analysis ...
Dear Abhay Kumar
Interesting article, thanks for sharing. Could you please elaborate on the speckle stickering that was utilised in the above work?
Thank you
Naveen
Dear Naveen Revanna
Interesting query! Thanks for asking.
Kindly check the images of the printed speckle stickers onto the specimen in supporting information of the article.
Article Assessment of Notch Effect Based on Finite Element Analysis ...
The printed speckle stickers consist of a large number of randomly distributed speckles of the same dot sizes. The sticker white portion shine when the light is fallen on the surface. This effect shows a surface with only black dots visible as can be seen in Fig. S2 of the supporting information. These stickers were capable of tracing the deformation path efficiently.
For the complete details of the DIC procedure, Kindly check section 2.3 of the article.
Hope this information helps you with your work.
Dear Abhay Kumar
Thank you very much for your kind explanation.
Naveen.
Dear Dario Ambrosini
Thank you for your suggestion. A Good Practices Guide for DIC is a handy document.
Best Regards,
Naveen
This paper open free could be useful:
Zollini, S., Alicandro, M., Dominici, D., Quaresima, R., Giallonardo, M. (2020). UAV photogrammetry for concrete bridge inspection using object-based image analysis (OBIA). Remote Sensing, 2020, 12(19), pp. 1–16, 3180
Best regards
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