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The major function of the urinary bladder is the storage and release of urine. Undergoing large deformations while keeping the chemically aggressive urine and maintaining a relatively constant pressure during filling, the bladder shows remarkable mechanical properties. Those properties are based on the highly complex structure of the bladder wall. However, irregularities within the bladder wall may...
This work presents numerical simulations and selected results of the flow over aquatic canopies, consisting of artificial flexible rectangular blades, arranged in a well‐defined order. The results obtained with three different Reynolds and Cauchy numbers are compared with experimental data achieving good agreement. The considered range of Cauchy numbers represents three different types of canopies...
It is well known that classical homogenization schemes, such as the Taylor/Voigt and Reuss/Sachs assumptions, can also be interpreted as energetic bounds. Furthermore, energy relaxation concepts have been established that determine stable effective material responses based on appropriate (convex, quasi‐convex, rank‐one) energy hulls for non‐convex energy landscapes associated with multi‐phase materials,...
The combination of electric and magnetic materials opens new possibilities in the field of sensor technologies and data storage [1]. These magneto‐electric (ME) materials have the property to change a physical ferroic quantity into another, i.e. a magnetic field can change the electric polarization and vice versa. The combination of multiple ferroic characteristics within materials is called multiferroic...
In the context of mechanical fluid‐structure interaction (FSI) comprising moving or deforming structures, fluid discretizations need to cope with time‐dependent fluid domains and resulting grid deformations in addition to the general challenges regarding e.g. boundary layers and turbulent phenomena. Recent approaches in the simulation of compressible turbulent flow are based on so‐called split forms...
The treatment for Coronary Heart Diseases – caused by the deposition of plaque on arterial walls – which has been the deployment of a metal stent in the blocked artery, poses serious complications in the form of accumulation of blood clots due to the permanent and rigid nature of metals. Meanwhile, Bioresorbable Vascular Scaffolds (BVSs) – made up of poly l‐lactide (PLLA) – are transient implants...
In the present work, the mechanical properties of spider silk are assigned to the airbag fabric material. Finite element simulations were performed on the airbag model in order to study its benefits over the traditional fabric material. We designed the airbag model with spider silk material and performed impact analysis. Finally, the obtained results are compared with the standard airbag test. Our...
Several die casting materials show different mechanical responses for specimens with different thicknesses. This can be observed in the variation of parameters, such as the Young's modulus, the tensile strength or hardness of the material in specimens with different thicknesses. In order to model this effect, we have experimentally investigated a specimen of a zinc die casting alloy. We concentrate...
The Polycrystalline materials grain boundary structure, crystalline texture and grain surface morphology, each plays an important role in interface transport. Among the different surface evolution phenomenas, the objective of the current work is to study the kinetics of grooving by surface diffusion only. Most of the existing theoretical and computational models use two dimensional grooving with one...
Strain‐induced crystallization in natural rubber has been widely investigated in the last decades by scattering techniques. Due to dissipative processes and structural changes in the material, deformation processes are accompanied with a significant amount of heat production/consumption. Time‐resolved wide‐angle X‐ray diffraction (WAXD) was used to characterize the structural changes in natural rubber...
Ferroelectric as well as ferromagnetic materials are widely used in smart structures and devices as actuators, sensors etc. Most of the developed models, describing the nonlinear behavior, are implemented within the framework of the Finite Element Method. Most investigations, however, are restricted to simple boundary value problems under uniaxial or biaxial loading and their goal is the calculation...
In this work we present an upscaling technique for multi‐scale computations based on random microstructures modelled as realisations of lognormally distributed random fields, or described by randomly distributed inclusions in a homogeneous matrix. Their corresponding coarse‐scale model parameters are considered as uncertain, and are approximated by random variables, the distributions of which are...
Mechanical systems have structural properties, e.g. symplecticity, symmetry, and a specific energy behavior, which get lost in standard integration methods. Therefore, symplectic integration methods are used in simulation and control of mechanical systems. This paper combines two methods of the class of structure‐preserving control methods, namely a recently developed feedback control method and open...
In this paper an image‐based control for an optomechanical image derotator is implemented. A derotator is an optical system to support measurements on rotating components by tracking their rotational movement. As a consequence, the position and rotational velocity of the measurement object has to be known continuously. In general this would be accomplished by measuring these variables using a rotary...
The static equilibrium of porous elastic materials with triple‐porosity is considered in the case of an elastic Cosserat medium. A two‐dimensional system of equations of plane deformation is written in the complex form and its general solution is represented by means of three analytic functions of a complex variable and three solutions of Helmholtz equations. The constructed general solution enables...
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