We investigate propagating fronts in disordered media that belong to the universality class of wetting contact lines and planar tensile crack fronts. We derive from first principles their nonlinear equations of motion, using the generalized Griffith criterion for crack fronts and three standard mobility laws for contact lines. Then we study their roughness using the self-consistent expansion. W...

The problem of dynamic symmetric branching of a tensile crack propagating in a brittle material is studied within Linear Elastic Fracture Mechanics theory. The Griffith energy criterion and the principle of local symmetry provide necessary conditions for the onset of dynamic branching instability and for the subsequent paths of the branches. The theory predicts a critical velocity for branching...

In this paper, the inclinometer is used to control the balance of a humanoid robot on a miniature surfboard. GHR (Griffith University Humanoid Robot) is the humanoid robot developed in the Robotics and Games laboratory, at Griffith University. In order to measure the angle of the inclining surfboard, the inclinometer is attached to the back of the right foot of the GHR. To remove the high frequ...

After second world war, we have seen a very rapid development of Thermoelasticity stimulated by various engineering sciences. As we know, structures behave in different fashion under climate variation and the most responsible factor for these variations is heat which falls through and causes deformation of the body. A considerable progress in the field of aircraft and machine structures, mainly...

We investigate the scattering of plane harmonic compression and shear waves by a Griffith crack in an infinite isotropic dielectric polymer. The dielectric polymer is permeated by a uniform electric field normal to the crack face, and the incoming wave is applied in an arbitrary direction. By the use of Fourier transforms, we reduce the problem to that of solving two simultaneous dual integral ...

The Brazilian test has been extremely popular while prompting significant debate. main source of controversy is rooted in its indirect nature; the material tensile strength inferred upon assuming that cracking initiates at centre sample. Here, we use Griffith criterion and finite element analysis to map conditions (jaws geometry properties) result nucleation a crack. Unlike previous studies, do...

Abstract-Transonic interfacial crack growth in bimaterial systems is analysed, and the asymptotic field around the moving crack tip is obtained by the straightforward approach of analytic continuation. The power of singularity is less than l/2 for anti-plane shear deformation. For in-plane deformation, the power of singularity can be real or complex, depending on the speed of the crack tip. Acr...

Within the last 5 years, increasing numbers of children exposed prenatally to cocaine and crack have been evaluated in the preschool and school-age years. Although there are few published reports to date about the findings of longitudinal followup efforts beyond the first 12 to 24 months of age (Chasnoff et al. 1992; Griffith et al. 1994), sufficient data are beginning to emerge from animal and...

Cracks in thin layers are influenced by what lies beneath them. From buried craters to crocodile skin, crack patterns are found over an enormous range of length scales. Regardless of absolute size, their substrates can dramatically influence how cracks form, guiding them in some cases, or shielding regions from them in others. Here we investigate how a substrate's shape affects the appearance o...

The initiation of a crack in a sound body is a real issue in the setting of Griffith’s theory of brittle fracture. If one uses the concept of critical energy release rate (Griffith’s criterion), it is in general impossible to initiate a crack. On the other hand, if we replace it by a least energy principle (Francfort–Marigo’s criterion), it becomes possible to predict the onset of cracking in a...