The boundary conditions in direct simple shear tests: Developments for peat testing at low normal stress

More than the half of the Netherlands is under the high level of sea and rivers. Therefore, evaluating the safety of dykes is primordial. A specific interest is given to peat dykes safety which suffer of a lack of knowledge which manifested recently by some peat dykes failures (Van Baars 2005). The behaviour of peat is also of interest in others...

Finite element modelling of a shear box experiment on ice rubble

Analytical and numerical analysis of laboratory-scale shear box experiments on ice rubble have been performed. The experiments were done at NTNU in 2010 (Serré et al., 2011 and Repetto and Høyland, 2011). Three phases in the force-time history of the tests were identified (similar to what Serré et al., 2011 did). The first phase lasted about 2...

Error analysis of 3D shearography using finite-element modelling

This paper describes the development of an opto-mechanical simulation of a complete shearography system, including the shearography instrument, the samples and the test environment. This simulation is applied to the measurement of 3D strains in engineering samples. The samples are a cylinder loaded by internal pressure and a flat plate under...

Error analysis of 3D shearography using finite-element modelling

This paper describes the development of an opto-mechanical simulation of a complete shearography system, including the shearography instrument, the samples and the test environment. This simulation is applied to the measurement of 3D strains in engineering samples. The samples are a cylinder loaded by internal pressure and a flat plate under...

Freeze-bond strength: Analysis of experiments and FE modeling of a shear test on freeze bonds

The objective of this study was to contribute to the knowledge on ice-ridges structures interactions. This work is a follow-up of previous research on simulations of ice-structure interaction using finite element method (Gürtner, 2009b; Konuk, et al., 2009a,b) and a preliminary study of freeze-bond (FB) shear strength (Repetto-Llamazares, et al....

The mechanical behavior of orbital fat in a finite element model of orbilat mechanics

Numerical modelling on super-diffusion of carbon-dioxide in coal

Case II (super)-diffusion is characterized by a diffusion like process that goes faster than the square root of time. Superdiffusion can occur in polymeric structures if a stress gradient enhances the diffusion process. In such a case the part of the polymer invaded by the penetrant, e.g. CO2, undergoes a transition in structure from the glass...

Blijvend vlakke wegen - CROW-werkgroep integraal wegontwerp - evaluatie van schadecases uit de praktijk

This report presents an inquiry into cases of pavement design, construction and maintenance in which distress has been observed instigated by deeper subgrade or by inadequate attention for the interaction between subgrade and pavement structure. Almost all cases are situated in areas with subgrade of poor to marginal bearing capacity. The cases...

Hypoplasticity Investigated: Parameter Determination and Numerical Simulation

Due to the weak soil deposits in the Netherlands, pile foundations consisting of driven displacement piles are often used to support the superstructure. The influence of pile installation process on the stresses and the soil properties is large. In geotechnical practise the effect of the pile installation and the interaction with neighbouring...

Virtual thermo-mechanical prototyping of microelectronics devices

Microelectronics have pervaded our lives for the past fifty years, with massive penetration into health, mobility, safety and security, communications, education, entertainment and virtually every aspect of human lives. The main technology drivers that enabled this expansion are miniaturization and integration. The combination of these two has...

Local Cooling during Welding: Prediction and Control of Residual Stresses and Buckling Distortion

One of the major problems during welding of thin plate structures is the occurrence of buckling distortion. This type of distortion is caused by the formation of compressive welding stresses; when these stresses exceed a certain critical stress level, the structure will buckle. Most methods for eliminating the welding induced buckling distortion...

Biomechanics of the pelvic floor musculature

The present thesis was motivated by two main goals. The first research goal of the thesis was to understand the complex biomechanical behaviour of the pelvic floor muscles. The second goal was to study the mechanism of the pelvic organ prolapse (genital prolapse). The pelvic floor in humans is a very complex muscular structure. It is largely...

Methods to Reduce Oblique Bending in a Steel Sheet Pile Wall, A 3D numerical simulation

For over three quarters of a century steel sheet pile walls are applied in geotechnical practice. For example in quay walls and construction pits in urban surroundings. Steel sheet pile walls are often composed of so called double U-profiles. These profiles consist of two single U profiles fixed in the common interlock by welding or crimping. A...

A 3D numerical simulation of oblique bending in a steel sheet pile wall - A quantification of soil influence

In geotechnical practice frequently use is made of steel sheet pile walls for soil and/or water retaining constructions. High demands are made with respect to the deformations, in particular in urban surroundings. Often these walls are composed of V- or Z-shaped profiles, whereby both profiles have their specific advantages and disadvantages. A...

Lumped impulses, discrete displacements and a moving load analysis

Finite element models are usually presented as relations between lumped forces and discrete displacements. Mostly finite element models are found by the elaboration of the method of the virtual work - which is a special case of the Galerkin's variational principle -. By application of Galerkin's variational principle to time dependent problems,...

Reliability Related Research on Plastic IC-Packages: A Test Chip Approach : A Research in the Development of Silicon Test Dies for Measurement and Comparison of Molded IC-Package Reliability, Een onderzoek gericht op de ontwikkeling van silicium test-chips geschikt voor het meten en vergelijken van de bedrijfszekerheid van plastic IC omhullingen