Abstract
Stress and strain monitoring is of great significance for wood drying. Using digital image correlation (DIC), this study measured displacement and strain changes during wood drying in real time. The results showed the following: (1) Analysis of tangential and radial shrinkage ratio. In the early stage of drying, the tangential and radial shrinkage ratio was relatively flat. In the middle stage of drying, the shrinkage ratio began to increase gradually. In the later stage of drying, the tangential shrinkage ratio was approximately twice as large as that in the radial direction. (2) Tangential and radial strain distribution. The radial strain distribution was more scattered than that in the tangential direction. The radial strain distribution was compressive strain on both ends of specimen, and the tensile strain was on the center. The tangential strain distribution was tensile strain on the left side of specimen and compression strain on the right. Overall, DIC is stable and reliable, and it can be used to monitor well the stress and strain changes during wood drying.
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