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Crack Propagation and Fracture Process Zone (FPZ) of Wood in the Longitudinal Direction Determined Using Digital Image Correlation (DIC) Technique

1
Department of Civil Engineering, Shantou University, Shantou 515063, China
2
Department of Civil Engineering, Beijing Forestry University, Beijing 10083, China
3
College of Civil Engineering and Architecture, Zhejiang University, Hanghzou 310027, China
4
Department of Civil and Environmental Engineering, University of Wisconsin, Platteville, WI 53818, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(13), 1562; https://doi.org/10.3390/rs11131562
Received: 6 May 2019 / Revised: 27 June 2019 / Accepted: 28 June 2019 / Published: 2 July 2019
(This article belongs to the Special Issue Vision-Based Sensing in Engineering Structures)
As a state-of-the-art method, the digital image correlation (DIC) technique is used to capture the fracture properties of wood along the longitudinal direction, such as the crack propagation, the strain field, and the fracture process zone (FPZ). Single-edge notched (SEN) specimens made of Douglas fir (Pseudotsuga menziesii) from Canada with different notch-to-depth ratios are tested by three-point-bending (3-p-b) experiment. The crack mouth opening displacements (CMOD) measured by the clip gauge and DIC technique agree well with each other, verifying the applicability of the DIC technique. Then, the quasi-brittle fracture process of wood is analyzed by combing the load-CMOD curve and the strain field in front of the preformed crack. Additionally, the equivalent elastic crack length is calculated using the linear superposition hypothesis. The comparison between the FPZ evolution and the equivalent elastic crack shows that specimens with higher notch-to-depth ratios have better cohesive effect and higher cracking resistance. View Full-Text
Keywords: wood; mode I fracture; digital image correlation (DIC), fracture process zone (FRP), crack propagation wood; mode I fracture; digital image correlation (DIC), fracture process zone (FRP), crack propagation
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MDPI and ACS Style

Yu, Y.; Zeng, W.; Liu, W.; Zhang, H.; Wang, X. Crack Propagation and Fracture Process Zone (FPZ) of Wood in the Longitudinal Direction Determined Using Digital Image Correlation (DIC) Technique. Remote Sens. 2019, 11, 1562.

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