Fracture energy approach for the identification of changes in the wood caused by the drying processes

Hermann Pleschberger; Christian Hansmann; Ulrich Mueller; Alfred Teischinger

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Fracture energy approach for the identification of changes in the wood caused by the drying processes

机译：断裂能方法，用于识别由干燥过程引起的木材变化

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Specific fracture energy measurements were applied to identify changes caused by wood-drying processes of solid wood. Specimen design and geometry as well as parameters and specifications for a fracture energy test were determined experimentally. The specific test set-up was applied on plantation teakwood sample sets of standard as well as alternating convection kiln dryings and one oven drying. The results show that alternating changes of the drying temperature along with the equilibrium moisture content (EMC) in a kiln schedule have a small but significant decreasing effect on the specific fracture energy in the radial/longitudinal as well as the tangential/longitudinal testing direction. Furthermore, oven drying at constant high drying temperature along with low EMC did not result in a significant change of specific fracture energy compared with standard drying, but caused greater scattering values in both transverse crack propagation systems.

机译：应用特定的断裂能测量来确定由实木的木材干燥过程引起的变化。实验确定了试样设计和几何形状以及断裂能测试的参数和规格。将特定的测试设置应用于标准的人工林柚木样品组，以及对流窑干燥和一次烤箱干燥的交替进行。结果表明，干燥温度的变化以及窑炉时间表中的平衡水分含量（EMC）的交替变化对径向/纵向以及切向/纵向测试方向上的比断裂能具有很小但明显的降低作用。此外，与标准干燥相比，在恒定的较高干燥温度下进行的烤箱干燥以及较低的EMC不会导致比断裂能的显着变化，但是会在两个横向裂纹扩展系统中引起更大的散射值。

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《Wood Science and Technology》 |2013年第6期|1323-1334|共12页
作者
Hermann Pleschberger; Christian Hansmann; Ulrich Mueller; Alfred Teischinger;
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Wood K plus, Competence Centre for Wood Composites and Wood Chemistry, Altenberger Strasse 69, 4040 Linz, Austria;

Wood K plus, Competence Centre for Wood Composites and Wood Chemistry, Altenberger Strasse 69, 4040 Linz, Austria;

Wood K plus, Competence Centre for Wood Composites and Wood Chemistry, Altenberger Strasse 69, 4040 Linz, Austria,Department of Material Science and Process Engineering, Institute of Wood Technology and Renewable Resources, University of Natural Resources and Life Science. Vienna, Austria;

Wood K plus, Competence Centre for Wood Composites and Wood Chemistry, Altenberger Strasse 69, 4040 Linz, Austria,Department of Material Science and Process Engineering, Institute of Wood Technology and Renewable Resources, University of Natural Resources and Life Science. Vienna, Austria;

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Fracture energy approach for the identification of changes in the wood caused by the drying processes

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