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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...

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Related Experiment Video

Updated: Sep 23, 2025

Three-Dimensional Shape Modeling and Analysis of Brain Structures

Three-Dimensional Shape Modeling and Analysis of Brain Structures

Published on: November 14, 2019

Three-dimensional shape and deformation measurement on complex structure parts.

Zhoujie Wu¹, Wenbo Guo¹, Zhengdong Chen¹

¹College of Electronics and Information Engineering, Sichuan University, Chengdu, 610065, China.

Scientific Reports

|May 11, 2022

Summary

This study introduces a novel single-camera method combining fringe projection profilometry and digital image correlation for accurate 3D shape and deformation measurement. This approach overcomes limitations of stereo-DIC for complex structures.

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Area of Science:

Optical Measurement
Mechanical Engineering
Materials Science

Background:

Stereo digital image correlation (stereo-DIC) is a powerful tool for 3D shape and deformation analysis.
However, stereo-DIC struggles with complex geometries due to perspective distortion.

Purpose of the Study:

To develop a robust method for precise 3D shape and deformation measurement of complex structures.
To overcome the limitations of traditional stereo-DIC in handling severe perspective distortions.

Main Methods:

A single-camera system integrating fringe projection profilometry (FPP) and digital image correlation (DIC) was employed.
Gray-coded FPP was used for pixel-wise 3D geometry reconstruction, followed by DIC for temporal matching and tracking.
Speckle pattern design and fringe denoising were optimized for accuracy.

Main Results:

The proposed method successfully reconstructed complete 3D geometry and tracked full-field deformation pixel-to-pixel.
Simultaneous in- and out-of-plane deformation measurements were achieved with high accuracy.
The technique proved effective for complex components like honeycomb structures and braided composite tubes.

Conclusions:

The DIC-assisted FPP method offers an effective solution for 3D shape and deformation measurement on challenging complex parts.
This approach surpasses traditional stereo-DIC limitations, enabling measurements previously considered impossible.