Strain Measurements within Fibre Boards. Part II: Strain Concentrations at the Crack Tip of MDF Specimens Tested by the Wedge Splitting Method
Abstract
:1. Introduction
2. Experimental Section
2.1. Specific Fracture Energy
2.2. Stress Intensity Factor
2.3. Speckle Measurement
3. Results and Discussion
3.1. Specific Fracture Energy
Panel | GC1 (J/m2) | Slope1 (J/m3) | Gf2 (J/m2) |
---|---|---|---|
609 kg/m3 (19 mm) | 48,2 | 296 | 61,52 |
737 kg/m3 (19 mm) | 48,4 | 303 | 62,04 |
3.2. Stress Intensity Factor
Density, (kg/m3) | Gc, (J/m2) | E, (MPa) | ν, (-) | KIC, (MPam0.5) | |
---|---|---|---|---|---|
MDF 38 | 609 | 59 | 90 | 0.33 | 0.077 |
MDF 46 | 737 | 48 | 200 | 0.33 | 0.104 |
3.3. ESPI Measurement
Specimen | Process zone length in crack forward direction from vertical profiles in (mm); Method 1 | Process zone width in (mm) from horizontal profiles; Method 1 | Process zone width in (mm) from horizontal profiles; Method 2 |
---|---|---|---|
1 (KS 3) | 7.66 | 2.44 | 6.23 |
2 (KS 7) | 5.47 | 2.75 | 6.58 |
3 (KS 12) | 5.83 | 2.57 | 6.12 |
4. Conclusions
Acknowledgments
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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. https://doi.org/10.3390/ma5081495
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. https://doi.org/10.3390/ma5081495
Chicago/Turabian StyleSinn, Gerhard, Ulrich Müller, Johannes Konnerth, and Jörn Rathke. 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. https://doi.org/10.3390/ma5081495
APA StyleSinn, G., Müller, U., Konnerth, J., & Rathke, J. (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(8), 1495-1507. https://doi.org/10.3390/ma5081495