Effect of Fibre Orientation on the Bond Properties of Softwood and Hardwood Interfaces

Increasing concerns regarding carbon emissions and climate change are prompting a shift toward the use of sustainable materials in construction industry. Engineered timber products gaining attention industry due to advancements lamination techniques adhesives as well renewable characteristics wood. Bond properties play significant role engineered products. In Australia, Radiata Pine (RP, softwood) Shining Gum (SG, hardwood) share large proportion local native plantation forest resources. The present paper investigates bond behaviours Australian softwoods (RP–RP), hardwoods (SG–SG) hybrid-wood (RP–SG) combinations both parallel (PAL) perpendicular (PER) bonding directions using one-component polyurethane adhesives. results indicate that most softwood samples were subjected wood-side (timber) failure, whereas hardwood failed delamination but exhibited higher strength stiffness regardless direction. contrast, direction had effect on hybrid configurations. Improved observed when bonded PAL directions; however, negative effects seen PER directions. Obtained characteristic (5th percentile) shear strengths for RP–RP–PAL, RP–SG–PAL SG–SG–PAL 3.88 MPa, 6.19 MPa 8.34 whilst those RP–RP–PER, RP–SG–PER SG–SG–PER 3.45 2.96 7.83 respectively.