In this paper, we consider the unilateral frictional contact problem of a hyperelastic body in the case of large displacements and small strains. In order to retain the linear elasticity framework, we decompose the deformation into a large global rotation and a small elastic displacement. This co-rotational approach is combined with a primal-dual active set strategy to tackle the contact proble...

Unit cell homogenization techniques are applied on multiple length scales to compute the macroscopic hyperelastic stiffness characteristics of textile-reinforced polymer matrix composites. On the smallest scale (~50μm) the effective transversely isotropic properties of tows (or yarns) are computed based on both fiber and matrix properties. These position-dependent transversely isotropic effecti...

We present a recent existence result concerning the quasistatic evolution of cracks in hyperelastic brittle materials, in the framework of finite elasticity with non-interpenetration. In particular, here we consider the problem where no Dirichlet conditions are imposed, the boundary is traction-free, and the body is subject only to time-dependent volume forces. This allows us to present the mai...

We prove that the Ciarlet-Nečas non-interpenetration of matter condition [9] can be extended to the case of SBV -deformations of hyperelastic brittle materials, and can be taken into account for some variational models in fracture mechanics. In order to formulate such a condition, we define the deformed configuration under an SBV -map by means of the approximately differentiable representative,...

Resume — A muscle-driven model of human lower face was established. Three pairs of facial mimic muscles (ZM Zygomaticus Major, LLS Levator Labii Superioris, LAO Levator Anguli Oris), subcutaneous soft tissues, skin and skull were reconstructed based on segmentation of subject-specific MRI data. FE simulation were performed to reproduce designed facial mimic positions (e.g. pronunciation of soun...

This paper describes the implementation, verification, and comparison of two techniques for updating nonlinear finite-element structural dynamics models using transient time-domain data. The methods are motivated in terms of the intended applications, and the derivations are shown as they relate to the model updating methods for linear finite element models. The application of the two methods t...

This paper presents a dynamic biomechanical model of the face. It is implemented with a finite element method in the ANSYS software environment. A three layered mesh adapted to the description of the complex face muscles’ courses have been defined. Soft tissues are modelled using a hyperelastic law. The variations of muscle tissues’ mechanical properties associated with muscle activation are fu...

Abstract. In this article, we prove that solutions to a problem in nonlinear elasticity corresponding to small initial displacements exist globally in the exterior of a nontrapping obstacle. The medium is assumed to be homogeneous, isotropic, and hyperelastic, and the nonlinearity is assumed to satisfy a null condition. The techniques contained herein would allow for more complicated geometries...

Introduction To overcome the expense and limitations of cadaveric testing, we developed a finite element (FE) foot model. Previous foot models have included hyperelastic materials, plantar fascia, and extrinsic muscle forces [1]. We also included the plantar fat pad and both distal and proximal cartilage in our model. We validated the model by comparing plantar pressures and joint angles to lit...

A 9 year old Libyan boy presented with a history of delayed walking and abnormal gait. The presence of marked muscle under-development with hypotonia led to the initial diagnosis of primary muscle disease; later, he was found to have hyperelastic, fragile skin and hypermobile joints-the cardinal features of Ehlers Danlos syndrome. In this instance the disease seems to have been inherited in an ...