A mechanical model for the prediction of mode I delamination failure of a laminated double cantilever beam (DCB) type specimen is presented. The volume of material ahead of the crack tip that experiences high stresses due to the presence of the crack tip was replaced by a nonlinear elastic spring foundation. The volume undergoing global deformation due to the external loading was replaced by a ...

A 2-dimensional, elastic-plastic finite element model has been developed to simulate plasticity induced crack closure in slanted and deflected cracks growing outside the small scale yielding (SSY) regime. The finite element model allows for contact between deformable surfaces to capture the complex contact interaction between the crack faces. Coulomb’s friction law has been used to model fricti...

Introduction: To evaluate and compare shear bond strength of self-cure and  light-cure composites using a universal bonding system. Materials and Methods: Superficial coronal dentin of 62 intact extracted  premolars was exposed and bonding agent (All-Bond Universal) was applied over the  dentin surface according to the manufacturer instruction (self-etch mode). Then  samples were distribut...

(Z. Natur forsch. 3 1 a . 8 0 0 8 0 7 [1976] ; received M a y 10, 1976) A two-d imensional Poiseui l le flow in a rad ia l d i rec t ion al lows to study s imul taneously a whole range of flow rates. Three d i f ferent de format ion modes of the d i rector field have been observed, the 'bow' mode, the 'screw' mode, and the 'peak ' mode. Above a c r i t i ca l flow rate the bow mode t ransforms ...