Wood Static Bend Test | ASTM D143 | Equipment

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Wood Static Bend Test | ASTM D143 | Equipment

The nature of wood fiber and wood particle-based materials gives them many of the desired material properties of wood, with a more uniform structure and more consistent properties. ASTM has published a number of standards, containing collections of test methods for clear wood and wood-based materials, including fiberboard and particle board. Each standard has slightly different requirements for conducting flexural bend tests, which accommodate the specific wood material being tested. ASTM D143 static bend test calls for the use of bearing plates on articulating knife edge support rollers. The bearing plate reduces the risk of load concentrations that could deform and damage the specimen, while the articulating knife edge supports allow the plate to accommodate slight twisting in the wood specimen. It is required that the distance from the support point to the wood specimen mid-plane must not be greater than the specimen depth. Bending loads are applied to the wood beam specimens by a bearing block with 3 in. radius, for 2 x 2 x 30 in. primary specimens, or 1.5 in. radius, for 1 x 1 x 16 in. secondary specimens, at a constant crosshead displacement rate. Crosshead displacement rate is set at 0.10 in/min for primary specimens and 0.05 in/min for secondary specimens.