Computational Modelling of Particle Packing in Concrete

Physical particle packing is becoming a hot topic in concrete technology as more and more types of granular materials are used in concrete either for ecological or for engineering purposes. Although various analytical methods have been developed for optimum mixture design, comprehensive information on particle packing properties is still missing...

A continuous-discontinuous approach to simulate failure of quasi-brittle materials

A continuous-discontinuous approach to simulate failure is presented. The formulation covers both diffuse damage processes in the bulk material as well as the initiation and propagation of discrete cracks. Comparison with experimental data on layered sandstone shows that the modeling strategy accurately captures the physics of the failure process.

Local Buckling Behaviour of a Corrosion Resistant Alloy Liner in Tight Fit Pipe due to Axial Compression

A promising possibility to reduce corrosion resistant pipeline costs is the concept of Tight Fit Pipe, which is a double wall pipe where a Corrosion Resistant Alloy liner is mechanically fitted inside a carbon steel outer pipe. The mechanical bonding of the Tight Fit Pipe is made through a thermohydraulic manufacturing process. Problem...

Experimental and numerical analysis of a beam made of adhesively bonded tailor-made blanks

For aircraft structures, it is clear that the design and the selection of materials play an important role in the performance of the aircraft. The production costs are also important. The concept of tailor-made blanks (TMBs) is based on the use of dedicated blanks, made of different alloys and/or thickness in order to satisfy different demands...

Numerical strategies for corrosion management: Spatial statistics and finite element simulation

The techniques presented in this thesis are focused to improve corrosion management by providing a better insight into the nature of corrosion. Spatial statistics and finite element simulations are applied to different corrosion patterns to study possible interaction among pits. In order to achieve reliable results different spatial techniques...

Computation of reinforcement for solid concrete

Reinforcement in a concrete structure is often determined based on linear elastic stresses. This paper considers computation of the required reinforcement when these stresses have been determined by the finite element method with volume elements. Included are both tension reinforcement and compression reinforcement, multiple load combinations...

Modeling of combined physical-mechanical moisture induced damage in asphaltic mixes

Moisture induced damage in asphaltic mixes is recognized as a major issue, resulting to the need for frequent maintenance operations. This does not only imply high maintenance costs, but also temporary closure of traffic and hence increased road congestion. Given the high costs for the road authorities and the inconvenience for the road users,...

Three dimensional rigorous model for optical scattering problems

We present a three-dimensional model based on the finite element method for solving the time-harmonic Maxwell equation in optics. It applies to isotropic or anisotropic dielectrics and metals, and to many configurations such as an isolated scatterer in a multilayer, bi-gratings and crystals. We shall discuss the applications of the model to high...

A combined BEM/FEM method for IC substrate modeling

The research presented in this thesis was done in the context of the modeling of parasitic physical effects, like field couplings and crosstalk, that may adversely affect the functional performance of Integrated Circuits (ICs). The modeling of parasitic effects, through simulations with the resulting models, provides insight into the performance...

Implementation and evaluation of a binary mixture model and Fe-analysis on water saturated soil

A binary mixture model for soils has been formulated and analyzed. In the model one of the constituents is soil and the other constituent an incompressible liquid. The effects of water are included by formulating a mixture model is formulated as an extension of an existing non-associated elasto-plastic material model for granular materials. This...

Fluid-Solid Coupled Analysis based on ALE GSMAC-FEM

In the present study, the explicit computational method for fluid-solid coupled system is proposed based on ALE (Arbitrary Lagrangian-Eulerian) GSMAC(Generalized-Simplified Marker and Cell)-FEM suitable for low capacity and high speed computation in order to analyze the interaction of fluid and flexible rubber-like solid. The stability of time...

Fictitious Boundary and Moving Mesh Methods for the Numerical Simulation of Particulate Flow

This paper discusses numerical simulation techniques using a moving mesh approach together with the multigrid fictitious boundary method (FBM) for liquid-solid flow configurations. The flow is computed by an ALE formulation with a multigrid finite element solver (FEATFLOW), and the solid particles are allowed to move freely through the...

A monolithic FEM solver for an ALE formulation of fluid-structure interaction with configuration for numerical benchmarking

We investigate a monolithic algorithm to solve the problem of time dependent interaction between an incompressible viscous fluid and an elastic solid. The continuous formulation of the problem and its discretization is done in a monolithic way, treating the problem as one continuum. The Q2/P1 finite elements are used for the discretization and...

A coupling algorithm for high order solids and lattice Boltzmann fluid solvers

In this paper the implementation of the bidirectional coupling approach for the partitioned Lattice Boltzmann (LB) fluid flow and Finite Element (p-FEM) structural mechanics solver will be discussed. Earlier research on a benchmark configuration showed that the explicit coupling algorithm of the two methods was prone to instabilities for some...

Description model Rochussenstraat

Reliability of vibration prognosis by FEM for extensive measurements at test-site Rotterdam North:Input parameters phase 1

Timber-concrete composite beams

In this paper an easy-to-use design model for timber-concrete composite beams is discussed. The model is applicable for computer simulations as well as for hand calculations. A research programme was started in 1992 in co-operation with the University of Karlsruhe, to study the loadbearing capacities of timber-concrete composite beams that are...