NDLI: Moisture content effect on the fracture characterisation of Pinus pinaster under mode I

Content Provider	Springer Nature Link
Author	Xavier, J. Monteiro, P. Morais, J. J. L. Dourado, N. Moura, M. F. S. F.
Copyright Year	2014
Abstract	A moisture content effect on fracture characterisation of Pinus pinaster under mode I is addressed. The double cantilever beam test is selected for mode I loading, based on specimens scaled down to the growth ring level. Specimens are stabilised using aqueous solutions at several equilibrium moisture contents ( $$ M_{\text{e}} $$ ) ranging from 0 % to about 13 %. The strain energy release rate ( $$ G_{\text{I}} $$ ) is evaluated by applying the compliance-based beam method, from which the Resistance-curve is determined directly from load–displacement (P–δ) data without crack length measurement. The crack tip opening displacement in mode I ( $$ w_{\text{I}} $$ ) is determined by post-processing the displacements at the initial crack tip determined from digital image correlation. $$ G_{\text{I}} $$ and $$ w_{\text{I}} $$ are then combined for the direct identification of the cohesive law, $$ \sigma_{\text{I}} = {\text{f}}(w_{\text{I}} ) $$ , which is assumed in cohesive zone modelling. Experimentally, crack propagation consistently occurs in the earlywood layer. The increase of $$ M_{\text{e}} $$ does not show any influence on the initiation stage of the fracture process zone. However, a statistical correlation exists for the critical ( $$ G_{\text{I,max}} $$ ) and at maximum load ( $$ G_{{{\text{I,}}P_{ \hbox{max} } }} $$ ) values of $$ G_{\text{I}} $$ with regard to $$ M_{\text{e}} $$ . Consistently, the area under the identified cohesive curve increases with $$ M_{\text{e}} $$ , although high scatter and low correlation between maximum cohesive strength ( $$ \sigma_{\text{Iu}} $$ ) and $$ M_{\text{e}} $$ are observed. The methodology is also validated using finite element analysis including cohesive elements and taking into account the growth rings heterogeneity. The numerical results show that the identification of the cohesive law is insensitive to the variability of the growth ring structure observed experimentally.
Starting Page	7371
Ending Page	7381
Page Count	11
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	49
Issue Number	21
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2014-07-22
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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