A 10-year old boy, product of a non-consanguineous parents presented with developmental delay and poorly controlled seizures. On examination he had features suggestive of atypical growth of the body. There were asymmetric overgrowth of the skull, downward slanting of the palpebral fissures with ptosis, an epibulbar dermoid in the right eye (Figure 1) and a bony tumour (hyperostosis) of the exte...

The paper gives insights into modeling and well-posedness analysis driven by cyclic behavior of particular rate-independent constitutive equations based on the framework hypoplasticity elastoplastic concept with nonlinear kinematic hardening. Compared to classical elastoplasticity, in there is no need decompose deformation elastic plastic parts. two different types approaches show some similari...

A spontaneous shear localization in granular bodies is investigated with a finite element method based on a hypoplastic constitutive model. To simulate properly the formation of shear zones, a hypoplastic model was extended by polar, non-local and gradient terms to take into account a characteristic length of the microstructure. Two different rate boundary value problems were numerically analyz...

Abstract We investigate rate-independent strain paths in a granular material generated by periodically oscillating stress cycles using particular constitutive model within the hypoplasticity theory of Kolymbas type. It is assumed that irreversible hypoplastic effects decay to zero when void ratio reaches its theoretical minimum, while turn related evolution volumetric through mass conservation ...

Predicting the onset of shear band is significance in understanding failure geomaterials. The prediction accuracy dictated by constitutive model used for description pre-bifurcation behaviour. In this study, we first modify a recently proposed hypoplastic incorporating general strength criterion and stiffness function. We proceed to consider sand under true triaxial conditions. demonstrate that...

In geotechnical engineering, direct simple shear (DSS) tests are used to determine strength and stiffness parameters of a material. DSS predictions constitutive model influence failure mechanisms in plane-strain, finite-element applications. this article, we introduce closed-form solution the Matsuoka–Nakai equivalent critical friction angle from stress normal data. order apply it clay hypoplas...