Determining mode I cohesive law of Pinus pinasterby coupling double cantilever beam test withdigital image correlation

Frattura ed Integrità Strutturale

M. Oliveira¹  J. Xavier¹  J.J.L. Morais¹  M.F.S.F. de Moura² 

[1] Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes and Alto Douro, UTAD;INEGI, FEUP, University of Porto;

关键词: Wood;    Mode I fracture mechanics;    Double cantilever beam test;    Cohesive law;    Digital image correlation;   

DOI  :  10.3221/IGF-ESIS.31.02

来源: DOAJ

【 摘 要 】

The direct identification of the cohesive law in pure mode I of Pinus pinaster is addressed. The approach couples the double cantilever beam (DCB) test with digital image correlation (DIC). Wooden beam specimens loaded in the radial-longitudinal (RL) fracture propagation system are used. The strain energy release rate in mode I ( ) is uniquely determined from the load-displacement ( ) curve by means of the compliance-based beam method (CBBM). This method relies on the concept of equivalent elastic crack length ( ) and therefore does not require the monitoring of crack propagation during test. The crack tip opening displacement in mode I is determined from the displacement field at the initial crack tip. The cohesive law in mode I is then identified by numerical differentiation of the relationship. Moreover, the proposed procedure is validated by finite element analyses including cohesive zone modelling. It is concluded that the proposed data reduction scheme is adequate for assessing the cohesive law in pure mode I of P. pinaster

【 授权许可】

Unknown