Abstract:

Wood is elastic and viscous material from the mechanics point of view and the structure is full of aperture.These characters endow wood the ability of simple bending. To obtain small bending semi diameter the plastic of wood will be increased with strengthening the theory of softening. Then study the theory of longitudinal compressing and the technique of compressing. Cellular wall arises longitudinal crease when microsoft fibre slides with the effect of compressive stress. Smaller bending radius will be gained with limited transmutation when the compressing surface is formed to drape and drawing face is on the contrary with the action of bending moment. The result indicates that the specimens with the size of 280 mm×16.5 mm×16.6 mm dealt with water heat softening get the minimum radius 42.5 mm and average radius 56.94 mm with 24% compressing ratio and minimum rebound length 261.74 mm.

Key words: Elm, Wood water-heat softening, Longitudinal compressing, Minimum bending radius