A proposed mixed-mode fracture specimen for wood under creep loadings

作者：Pitti Rostand Moutou^*; Dubois Frederic; Pop Octavian

来源：International Journal of Fracture, 2011, 167(2): 195-209.

DOI：10.1007/s10704-010-9544-z

• Mixed modes fractures
• Wood specimen
• M integral
• Finite element analysis

A mixed-mode fracture specimen was designed in this paper. This geometry is a judicious compromise between a modified Double Cantilever Beam specimen and Compact Tension Shear specimens. The main objective is to propose a specimen which traduces a stable crack growth during creep loading taking into account viscoelastic behaviour under mixed-mode loadings. The numerical design is based on the instantaneous response traduced by a crack growth stability zone. This zone is characterized by a decrease of the instantaneous energy release rate versus the crack length. In order to obtain a mixed-mode separation, the paper deals with the use of the M-integral approach implemented in finite element software, according to energetic fracture criterions. In these considerations, a numerical geometric optimization is operated for different mixed-mode ratios. Finally, a common specimen which provides to obtain fracture parameters, viscoelastic properties and creep crack growth process for different mixed-mode configurations is proposed.

• 出版日期2011-2