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http://dx.doi.org/10.5658/WOOD.2013.41.6.535

Analysis of residual drying stress in Larix Kaempferi wood used as glulam laminar  

Han, Yeonjung (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Chang, Yoon-Seong (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Park, Yonggun (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Jeong, Gi-Young (Division of Forest Resources, College of Agriculture and Life Sciences, Chonnam National University)
Hong, Jung-Pyo (SK Forest)
Lee, Jun-Jae (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Yeo, Hwanmyeong (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.41, no.6, 2013 , pp. 535-543 More about this Journal
Abstract
The objective of this study was to analyse the residual stress in Larix kaempferi board during and after kiln-drying. The boards were primarily intended for using as laminar of cross laminated timber (CLT). In this study, the equivalence of moisture content by equalizing treatment was proved and reduction of residual stress by conditioning treatment was quantified. Prong test and slice test were carried out to analyse the residual stress in wood during drying. Transverse casehardening was measured immediately after making prong sample. Residual stress of four parts in wood from surface to center was analyzed quantitatively based on elastic deformation after just cutting slices from board. Tensile stress and compressive stress on the surface of board during drying did not exceed 2.2 MPa when boards were dried by kiln-drying schedule of T10-C4 and T12-D5. Because the tensile strength and compressive strength of transverse direction of Larix kaempferi lumber are 2.65 MPa and 4.60 MPa, application of more severe drying schedule can be recommended. Cup and twist were reduced by about 40% by equalizing and conditioning treatments after drying.
Keywords
kiln-drying; larch; moisture gradient; residual drying stress; warpage; equalizing; conditioning;
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