Abstract:

When wood bears load, damage in its meso-structure in material would grow, and the evolving behavior of damage and crack determines its micro-mechanics behaviors. Meso-damage elements of wood could be devided into four kinds: 1)cell or cell wall interface damage; 2)cell wall bucking and local landslide damaged zone; 3)micro-cavity damage and converge; 4)micro-cracks damage. Follow-up analyzing the entire process from deformation, damage to fracture and proving up the relationship between micro-structure evolution and micro-behavior would be useful to reveal the mechnism of wood rupture from which gains the new cognition of the interrelation between wood structure and its function of strength and toughness. They have a guiding for researching and developing new types of wood-based composite materials that would overcome the flaw of wood and have a special capability of strength and toughness.

Key words: wood damage-fracture, meso-damage elements, phenomenologi research