wood failure

wood failure

In plywood, the area of wood fiber remaining at the glueline following completion of a specified shear test.
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Substrate or wood failure was recognized when the failure happened at the wood substrate side.
This is because the tendency of wood failure near the bolts of the two-bolt connections is higher than that of single-bolt connections.
A weak joint, exhibiting little or no wood failure, might result from poor machining or under-cured or frosted joints, whereas too abrasive a grit or dull saw blades are typical culprits behind weak joints that fail along the glue lines.
The shear strength is calculated with relation 1 and the cohesive wood failure of shear area is determined.
The failure types included: glue failure (failure of the epoxide at the pin/paint interphase), cohesive coating failure, cohesive wood failure, failure between the coating layers, and failure of the wood-coating interphase (Figure 1).
He notices that there is very little wood failure, but that there is a crystal-like appearance to the glue that is present on the edges of the glued pieces.
6 Tear strength, pli 336 500 210 Brittle Table 7 -- Adhesion of Aliphatic Polyurea to Various Substrates Adhesion, Substrate Psi at Failure Method of Failure Concrete with aged epoxy sealer 876 Adhesive, intercoat Bare concrete, 25[degrees]C 876 Concrete failure Bare concrete, applied and cured at 0[degrees]C 836 Concrete failure 2 X 4 wood with latex sealer 815 Wood failure 2 X 4 wood with latex sealer (wet on wet) 958 Wood failure Steel with zinc rich epoxy/urethane topcoat 1447 Adhesive, intercoat Steel with flexible epoxy primer 937 Adhesive, intercoat Steel with epoxy amine protective coating >1835 No failure Aluminum, smooth, untreated 692 Adhesive, from substrate Blasted steel, 1.
Furthermore, the amount of wood failure increased for the PRF-bonded samples and decreased for the PU-bonded samples after accelerated aging tests.
Values of shear stress (a, c, e) and wood failure (b, d, f) determined for three species glued as part of an inside-out (moving the pith out) test.
Most adhesives were found to bond wood well enough to give wood failure under dry conditions.
Additional PRF tests were stopped after the initial series of glue-line tests showed unacceptable bonding results with respect to very shallow wood failure modes critical not only for maximum shear load capacity but for durable structural performance over time.