Characterization of Wood Fracture Using Optical Full Field Methods

Abstract:

In this paper a new formalism based on the complementarity between the optical full field techniques and integral invariant Mtheta is proposed in order to evaluate the fracture parameters in cracked specimen made of wood, under mixed mode loadings. The coupling between the experimental and numerical approaches allows identifying the fracture parameters in terms of energy release rate without any the material elastic properties such as the elastic modulus and the Poissons ratio. The proposed formalism allows also determining, in addition with the fracture parameters, the local elastic properties in terms of reduced elastic compliance. The fracture mixed mode tests are realized using a Single Edge Notch sample made in Douglas with the Arcan fixtures and dried to 11% moisture content and the crack is cutting in Radial-Longitudinal system.

• Periodical: Advanced Materials Research (Volume 778)
• Pages: 440-447
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.778.440
• Online since: September 2013
• Authors: Octavian Pop, Frédéric Dubois, Mamadou Méité, Joseph Absi
• Keywords: Digital Image Correlation (DIC), Energy Release Rate, Fracture Mechanics, Mixed Mode, Wood

References

[1] F. Mc Clintock, A criterion for ductile fracture by the growth of holes, Journal of Applied Mechanic. 35 (1968) 363–371.

[2] F. McClintock, On the plasticity of the growth of fatigue cracks. in: Drucker DD and Gilman JJ (Eds. ), Fracture of solids. John Wiley, New York, 1963, p.65–102.

[3] A. Pineau, Global and local approaches of fracture -Transferability of laboratory test results to components. in: Argon AS (Eds. ), Topics in Fracture and Fatigue. Springer, New-York, 1992) pp.197-234.

DOI: 10.1007/978-1-4612-2934-6_6

[4] A. Pineau A, P. Joly, Local versus global approaches to elasticplastic fracture mechanics : Application to ferritic steels and a cast duplex stainless steel. in: Blauel JC and Schwalbe K-H (Eds), Assessment in Components - Fundamentals and Applications, ESIS/EGF9. Mechanical Engineering Publications, London, 1991, pp.381-414.

[5] D. Guitard, Mécanique du matériau bois et composites, France, Cepadues – Edition, (1987).

[6] M. Méité, O. Pop, F. Dubois, J. Absi., Evaluation of mixed-mode integral invariant for polymer material trough the couple experimental-numerical Process, 14th International Conference on Experimental Mechanics (ICEM14), Poitiers, (2010).

DOI: 10.1051/epjconf/20100631007

[7] O. Pop, M. Meite, F. Dubois, J. Absi, Identification algorithm for fracture parameters by combining DIC and FEM approaches, International Journal of Fracture, 170 (2011) 101-114.

DOI: 10.1007/s10704-011-9605-y

[8] M. Meite, O. Pop, F. Dubois, J. Absi, Characterization of mixed-mode fracture based on a complementary analysis by means of full-field optical and finite element approaches, International Journal of Fracture, 180 (2013) 41-52.

DOI: 10.1007/s10704-012-9794-z

[9] M.A. Sutton, W.J. Wolters, W.H. Peters, W.F. Ranson, S.R. McNeil, Determination of Displacements Using an Improved Digital Correlation Method, Image and Vision Computating, 1 (1983) 133-139.

DOI: 10.1016/0262-8856(83)90064-1

[10] H.A. Bruck, S.R. McNeill, M.A. Sutton, W.H. Peters, Digital image correlation using Newton–Raphson method of partial differential correction, Experimental Mechanics, 29 (1989) 261–267.

DOI: 10.1007/bf02321405

[12] J. Réthoré, S. Roux, F. Hild, Optimal and noise-robust extraction of Fracture Mechanics parameters from kinematic measurements, Engineering Fracture Mechanics, 78 (2011) 1827-1845.

DOI: 10.1016/j.engfracmech.2011.01.012

[13] F. Dubois, C. Chazal, C. Petit, Viscoelastic crack growth process in wood timbers: an approach by the finite element method for mode I fracture, International Journal Fracture, 113 (2002) 367–882.

[14] F. Dubois, C. Petit, Modeling of the crack growth initiation in viscoelastic media by the Gθ integral, Engineering Fracture Mechanics, 72 (2005) 2821–2836.

DOI: 10.1016/j.engfracmech.2005.04.003

[15] N.I. Muskhelishvili, Some basic problem of mathematical theory of elasticity, English translation, Noordhoff, (1933).

[16] M. Williams, On the stress distribution at the base of a stationary crack. ASME, Journal of Applied Mechanic, 24 (1957) 109-114.

[17] S. Yoneyama, Y. Morimoto, M. Takashi, Automatic Evaluation of mixed-mode stress intensity factors utilizing digital image correlation. Strain, 42 (2006) 21-29.

DOI: 10.1111/j.1475-1305.2006.00246.x

[18] S. Yoneyama, T. Ogawa, Y. Kobayashi, Evaluating mixed-mode stress intensity factors from full-field displacement obtained by optical methods. Engineering Fracture Mechanic, 74 (2007) 1399-1412.

DOI: 10.1016/j.engfracmech.2006.08.004

[19] R. Moutou Pitti, Découplage des modes de rupture dans les matériaux viscoélastiques orthotropes : modélisation et expérimentation, PhD thesys, University of Limoges, (2008).

DOI: 10.1016/j.crme.2009.10.008

[20] R. Moutou Pitti, F. Dubois, C. Petit, N. Sauvat, Mixed mode fracture separation in viscoelastic orthotropic media: numerical and analytical approach by the Mθv –integral, International Journal of Fracture, 145 (2007) 181–193.

DOI: 10.1007/s10704-007-9111-4