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