Mechanical Properties MAJOR PROPERTIES: 1.Strength 2.Stiffness Defects are not controllable in large sized pieces Full sized members are not homogenous.

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Presentation transcript:

Mechanical Properties MAJOR PROPERTIES: 1.Strength 2.Stiffness Defects are not controllable in large sized pieces Full sized members are not homogenous Controllable factors: 1.Size of the specimen 2.Shape of the specimen

Relevant ASTM Standards ASTM D 143: Tests for small clear samples ASTM D 198: Tests for large samples ASTM D 2555: Tests establishing clear wood strength

Factors affecting strength Density: Directly proportional Growth: 1.Late wood: More strength 2.Early wood: Less strength Reaction wood : 1.Compression wood: in soft wood trees under side 2.Tension wood: in hard wood trees upper side Effect of moisture : Decrease in moisture below fiber saturation point increases strength and stiffness

Factors affecting strength Orientation: 1.Longitudinal “L” 2.Tangential “T” 3.Radial “R” Modulus of elasticity : Three moduli of elasticity E L : Elastic modulus along longitudinal direction E T : Elastic modulus along tangential direction E R : Elastic modulus along radial direction Poisson ratios : Six Poisson ratios

Modulus of elasticity Longitudinal direction Radial direction

Utilization 1.Structural timber 2.Plywood 3.Glued laminated timber 4.Manufactured wood products

Structural timber Roof truss Bridge truss Beams Columns 1.Posts 2.Poles 3.Piles

Roof truss

Bridge truss

Beams Tests as beam Bending test for Flexural strength

Columns Test Compression test For compressive Strength