Advances in Mechanical Engineering Research; Volume 2 by David E. Malach

By David E. Malach

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10) for the same crack length and now the energy of crack extension is equal to the decrease of elastic energy in the beam. 11) where again V 1 / 2 is the increase of the elastic energy and V (  1 ) the plastic energy of the flow of the joint. 11) then follows: 44 T. A. C. M. 8), despite of the plastic deformation. For connections, plastic deformation in the last case will not yet occur because it is coupled with crack extension. When the dowels of the joint are pressed into the wood, the crack opening increases and thus also crack extension.

The notched specimen discussed here also shows the low concentration reaction by the strong softening behaviour. Probably the coupled processes are the numerous small-cracks growing towards the macro notch, providing the site for the macro crack to grow as second low (crack-) concentration process. This failure mechanism thus applies for every bond breaking process at any level. 7. M van der Put, Deformation and damage processes in wood, Delft University Press, The Netherlands, (1989). W. M van der Put, A new fracture mechanics theory of orthotropic materials like wood, Engin.

A. C. M. van der Put The standard compact tension tests of [4] did show a stress intensity K Ic of 330 kNm3/ 2 . This result is independent on the chosen stiffness as follows from the calculation according to the series solution or according to the energy method. This is verified in [4] by comparing the series solution with a finite element compliance calculation using the isotropic and theorthotropic stiffness and the quite different orthotropic stiffness of [5]. The value of K Ic = 330 kNm3/ 2 , found in all cases, thus also should follow from the area under the softening curve of that compact tension test.

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