Fine Characterization and Analysis of Drying Strain of the ELM Board via DIC Technology

In this paper, the occurrence and development mechanism of strain on cross-section during wood drying is explored. Therefore, regularity 50 mm thickness elm (Ulmus rubra) board at temperature 40°C 80°C detected via digital image correlation technology. Hence, difference between tangential radial surface core layers was denoted. The results showed that distribution in width direction uneven. Moreover, a large shrinkage occurs near-core layer, while maximum reaches 4.08%. cracked along direction. higher than early stage drying, these strains are reversed later drying. related to board. These differences layer larger those layer. conducted research provide theoretical basis for process optimization.