Transverse mechanical behavior of wood under high temperature and pressurized steam

Document Type

Article

Publication Date

12-1-2008

Abstract

Transverse mechanical behavior of Japanese sugi (Cryptomeria japonica D. Don) under high temperature and pressurized steam environment was investigated. Measured tensile strength was compared with published data of transverse shrinkage, compression yield, and relaxed compression yield stresses. The results showed that at 100 percent relative humidity (RH), tensile strength of the wood along both radial and tangential directions gradually decreased, and the destructive tensile strain increased with increase in temperature. The increase in the destructive strain was more significant when temperatures increased above 100 °C. The relationship between tensile strength and temperature was similar to that of the maximum shrinkage stress and temperature from drying under high RH and different temperatures. Tensile strength and relaxed compression yield stress decreased at a similar rate with increase in temperature. The relationship of radial tensile strength and temperature agreed well with that of compressive yield stress and temperature in a temperature range from 80 to 180 °C at 100 percent RH. The maximum shrinkage stress values from drying were similar to those of relaxed compression yield stresses at the same temperature and RH conditions. The significant reduction of shrinkage stresses during drying under high temperatures and pressurized superheated steam was caused by stress relaxation. © Forest Products Society 2008.

Publication Source (Journal or Book title)

Forest Products Journal

First Page

63

Last Page

67

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