The fracture toughness of medium density fiberboard (MDF) including the effects of fiber bridging and crack–plane interference

✍ Scribed by Noah Matsumoto; John A. Nairn

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 552 KB
• Volume: 76
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/j.engfracmech.2009.04.007

✦ Synopsis

The fracture toughness of medium density fiberboard (MDF) as a function of crack length (R curve) was measured. Fracture toughness was determined from force-displacement and crack length data using a new energy analysis procedure that avoids the scatter of prior discrete analysis methods. Because crack lengths were difficult to observe, they were measured using digital image correlation (DIC). The R curves for two different densities of MDF, two thicknesses, and for both in-plane and through-the-thickness cracks all increased linearly with crack length. The increase was interpreted as the development of a fiber-bridging process zone. Numerical modeling methods were used to determine the cohesive stress of the fiber-bridging zone.