Abstract
Holographic interferometry is used to observe the components of displacement fields and detect crack initiation and its subsequent growth in a number of notched specimens of wood subjected to wedge-splitting tests. The technique allows for a continuous real-time observation of the evolution of the deformation behavior of wood specimens with the increase in the notch opening. The displacement maps show the highly anisotropic and non-homogeneous nature of wood. It is found that in the pine wood specimen the force at which the crack begins is about two-thirds of the peak load. The iso values of the in-plane displacement on the same specimen type are computed numerically by applying finite element analysis based on the concept of linear fracture mechanics, to each step of crack opening. The numerically generated displacement maps are compared with those obtained by holographic interferometry on real specimens. The presence of monotonie and non-monotonic displacement behavior of crack surfaces during crack growth in wood specimens is identified from the interferometrically obtained results. A discussion of the phenomena is given based on numerical simulation.
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