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- W136969147 abstract "Reaction wood produces very peculiar maturation stresses at the tree periphery, i.e. compressive stress or very high tensile stress, for compression and tension wood, respectively, as compared to moderately high tensile stress for normal wood. This means that both its mechanical state and its mechanical and physical properties differ from normal wood. Compression wood shows big differences from normal wood in conifers, for all physical and mechanical properties: higher density and axial crushing strength (MOR) but lower modulus of elasticity (MOE), far higher axial (longitudinal) shrinkage but lower radial and tangential shrinkage, sometimes even lower than the axial shrinkage. For tension wood things are less simple and can vary a lot from hardwood species to species. Globally there are no systematic differences in density and transverse shrinkage; MOE tends to be a little higher while MOR is slightly lower. However, axial shrinkage is much higher for tension wood with a gelatinous layer (G layer) than normal wood due to the specific gel-like organization of matrix in the G layer. For tension wood without a G layer (which is rather frequent) axial shrinkage is around two times higher than in normal wood. This paradoxical shrinkage is thought to originate from the release of maturation stresses during drying. Overall the very high tensile stress and stored elastic energy in tension wood lead to problems in wood processing (end splitting and board warping), which is far less the case for compression wood. But due to the large difference in properties relative to normal wood, compression wood occurrence is always a big problem for the in service behaviour of timber, which is seldom the case for tension wood." @default.
- W136969147 created "2016-06-24" @default.
- W136969147 creator A5000488180 @default.
- W136969147 creator A5026257232 @default.
- W136969147 date "2013-11-28" @default.
- W136969147 modified "2023-10-12" @default.
- W136969147 title "Physical and Mechanical Properties of Reaction Wood" @default.
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- W136969147 doi "https://doi.org/10.1007/978-3-642-10814-3_6" @default.
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