In this article, we derive the balance of linear and angular momentum equations for geometrically exact Cosserat rods from a two dimensional Lagrangian field approach in space and time. As we use a full quaternion description for the rotatory part of the balance equations, they constitute a system of nonlinear hyperbolic partial differential algebraic equations. We prove their equivalence to th...

A circular elastic disk is coated with an beam, absorbing shear and normal forces without deformation linearly reacting to a bending moment change in curvature. The inextensibility of the beam introduces isoperimetric constraint, so that length initial circumference constrained remain fixed during loading disk/coating system. mechanical model for this system formulated, solved general loading, ...

هدف: پژوهش حاضر با هدف شناسایی پیامدهای تحمل ابهام رهبران و طراحی الگوی جامعی از این پیامدها صورت ­گرفته ­است.طراحی/ روش‌شناسی/ رویکرد: رویکرد کیفی روش تحلیل­ مضمون انجام­ شده­ است. جامعه­ آماری عبارتند خبرگان دانشگاهی اجرایی وزارت نفت که تجربه تصمیم‌­گیری مدیریت در شرایط عدم اطمینان را دارند. نمونه نوزده نفر بوده ­است. نمونه‌­گیری پژوهش، هدفمند گلوله‌برفی انجام ­شد. داده‌ها نیز طریق مصاحبه گرد...

In this report, an algorithm for the detection of collision between two vehicles is presented. The mechanical models used for the vehicles are based on the theory of a Cosserat point. Here, we nd it convenient to establish the corresponding models using the theory of a pseudo-rigid body. This theory facilitates the development of our collision-detection algorithm. The report concludes with four...

We consider a thin curved film made of a martensitic material. The behavior of the film is governed by a free energy composed of a bulk energy term and an interfacial energy term. We show that the minimizers of the free energy converge to the minimizers of an energy depending on a two-dimensional deformation and one Cosserat vector field when the thickness of the curved film goes to zero. using...

Deformation microstructure is studied for a 1 D-shear problem in geometrically nonlinear Cosserat elasticity. Microstructure solutions are described analytically and numerically zero characteristic length scale.