The paper proposes a method of strength analysis for materials thin-walled shell structures reinforced with stiffeners. shells under consideration were made orthotropic materials. authors analyze the applicability following seven criteria: maximum stress criterion, Mises-Hill Fisher Goldenblatt-Kopnov Liu-Huang-Stout Tsai-Wu and Hoffman criterion. During study, doubly-curved shallow square in p...

The aim of this study was to investigate the potential application metal foams in shell-tube recuperators. A356 aluminium foam cast around internal and external surfaces a thin-walled copper tube enhance heat transfer between separated water streams at different temperatures. results demonstrated that drastically increased efficiency due its large volumetric surface area high thermal conductivi...

The paper presents the choice and method of calculating thin-walled structures that adequately reflect deformation in compensator example. When choosing a design model, influence structural elements their mechanical characteristics on its behavior various operating conditions is taken into account since sometimes small changes model can significantly impact analysis results. complete scheme mos...

Owning to their unparalleled sensitivity resolution, nanomechanical resonators have excellent capabilities in design of nano-sensors for gas detection. The current challenge is to develop newdesigns of the resonators for differentiating distinct gas atoms with a recognizably high sensitivity. In this work, the characteristics of impulse wave propagation in carbon nanotube-based sensors are inve...

As known from nearly incompressible elasticity selective reduced integration (SRI) is a simple and effective method to overcome the volumetric locking problem in 2D and 3D solid elements. The aim of this contribution is to discuss this method for finite deformation elastoviscoplasticity, though it is well known that there are limits, which will be investigated in more detail. In this context an...

The size of electronic devices becomes smaller and smaller and the utilized components and materials are subjected to complex environments including high temperatures, electrical current, mechanical stresses, and others. We need to evaluate the performance of these small-scale materials that are used in such devices. We have shown that these small-scale materials may suffer structural degradati...

Carbon nanotubes (CNTs) have been found as the promising semiconducting material for the future high performance nanoelectronics. As an important property for applications of a semiconductor, the band gap of a multi-walled CNT is related to its diameter. The capability of adjusting the material band gap is extremely important in sensor and electronics manufacturing. This paper discusses a real-...

Isogeometric cohesive elements are presented for modeling two and three dimensional delaminated composite structures. We exploit the knot insertion algorithm offered by NURBS (Non Uniform Rational B-splines) to generate cohesive elements along delamination planes in an automatic fashion. A complete computational framework is presented including pre-processing, processing and post-processing. Th...

Buckling of single-walled and multiwalled carbon nanotubes SWNTs and MWNTs, respectively due to axial compressive loads has been studied by molecular mechanics simulations, and results compared with those from the analysis of equivalent continuum structures using Euler buckling theory and the finite element method. It is found that a MWNT of large aspect ratio length/diameter buckles as a colum...

In this paper, individual and combined effects of distributed and local geometrical imperfections on the limit load of an isotropic, thin-walled cylindrical shell under axial compression are investigated. First eigen affine mode shape imperfection pattern (FEAMSIP) is taken as distributed geometrical imperfections and dent as local geometrical imperfections. Limit load of the cylindrical shells...