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Materials 2012, 5(8), 1495-1507; doi:10.3390/ma5081495
Article

Strain Measurements within Fibre Boards. Part II: Strain Concentrations at the Crack Tip of MDF Specimens Tested by the Wedge Splitting Method

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Received: 27 June 2012; in revised form: 17 August 2012 / Accepted: 21 August 2012 / Published: 23 August 2012
(This article belongs to the Special Issue Creep and Fracture of Engineering Materials and Structures)
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Abstract: This is the second part of an article series where the mechanical and fracture mechanical properties of medium density fiberboard (MDF) were studied. While the first part of the series focused on internal bond strength and density profiles, this article discusses the fracture mechanical properties of the core layer. Fracture properties were studied with a wedge splitting setup. The critical stress intensity factors as well as the specific fracture energies were determined. Critical stress intensity factors were calculated from maximum splitting force and two-dimensional isotropic finite elements simulations of the specimen geometry. Size and shape of micro crack zone were measured with electronic laser speckle interferometry. The process zone length was approx. 5 mm. The specific fracture energy was determined to be 45.2 ± 14.4 J/m2 and the critical stress intensity factor was 0.11 ± 0.02 MPa.
Keywords: electronic laser speckle interferometry; wedge splitting; medium density fiber board; fracture mechanics; process zone electronic laser speckle interferometry; wedge splitting; medium density fiber board; fracture mechanics; process zone
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Sinn, G.; Müller, U.; Konnerth, J.; Rathke, J. Strain Measurements within Fibre Boards. Part II: Strain Concentrations at the Crack Tip of MDF Specimens Tested by the Wedge Splitting Method. Materials 2012, 5, 1495-1507.

AMA Style

Sinn G, Müller U, Konnerth J, Rathke J. Strain Measurements within Fibre Boards. Part II: Strain Concentrations at the Crack Tip of MDF Specimens Tested by the Wedge Splitting Method. Materials. 2012; 5(8):1495-1507.

Chicago/Turabian Style

Sinn, Gerhard; Müller, Ulrich; Konnerth, Johannes; Rathke, Jörn. 2012. "Strain Measurements within Fibre Boards. Part II: Strain Concentrations at the Crack Tip of MDF Specimens Tested by the Wedge Splitting Method." Materials 5, no. 8: 1495-1507.


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