| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
Wood was explained as a quasi-brittle material. The method to analyze the fracture process of a wood specimen was tried to be established using image analysis. The crack development of specimens in a wedge splitting test and a SENB test was observed with digital image correlation technique. We succeeded in obtaining the stress-strain curve with strain-softening branch in a wide range of strain.
An effect on the crack development by thermally modifying was investigated to model a kiln drying. An obvious effects was not found using SEM observation, but differences among the species was found on the fracture surfaces. The effect on the fracture toughness and stress-relaxation behavior by thermo-wood process was also investigated. By heating processes in high temperature over 180°C, the fracture toughness decreased strongly and the stress-relaxation time increased. We thought that thermal degradation of polysaccharide and condensation of lignin affected on the behavior of the thermo-wood.
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