Static friction of sinusoidal surfaces: a discrete dislocation plasticity analysis

Discrete dislocation plasticity simulations are carried out to investigate the static frictional response of sinusoidal asperities with (sub)-microscale wavelength. The surfaces are first flattened and then sheared by a perfectly adhesive platen. Both bodies are explicitly modelled, and the external loading is applied on the top surface of...

Plasticity under rough surface contact and friction

The ultimate objective of this work is to gain a better understanding of the plastic behavior of rough metal surfaces under contact loading. Attention in this thesis focuses on the study of single and multiple asperities with micrometer scale dimensions, a scale at which plasticity is known to be size dependent. The asperities have very simple...

Static and fatigue performance of thick laminates test design and experimental compression results

Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules

Spin-transfer torque in magnetic tunnel junctions: Scattering theory

We study the bias-dependent spin-transfer torque in magnetic tunnel junctions in the Stoner model by scattering theory. We show that the in-plane (Slonczewski type) torque vanishes and subsequently reverses its direction when the bias voltage becomes larger or the barrier wider than material and device-dependent critical values. We are able to...

Procedures for parameter estimates of computational models for localized failure

In the last years, many computational models have been developed for tensile fracture in concrete. However, their reliability is related to the correct estimate of the model parameters, not all directly measurable during laboratory tests. Hence, the development of inverse procedures is needed, that provides the parameters estimate minimizing,...

Fracture scaling of concrete under multiaxial compression

The influence of specimen size on measured material properties in solid heterogeneous materials, such as concrete and rock, has been an issue of research and discussions for a few decades. A thorough understanding of the size effect phenomenon and the physical processes involved is imperative. An appreciable amount of experimental data on size...

Size effect of concrete and sandstone

A series of uniaxial tension experiments has been conducted to investigate the size effect on strength and fracture energy of concrete and sandstone. The experiments were carried on specimens of six different sizes in a scale range of 1:32. Depending on the material and the curing conditions a stronger or weaker size effect on the nominal...

Length control of individual carbon nanotubes by nanostructuring with a scanning tunneling microscope

Finite-size effects on the vortex-glass transition in thin YBa2Cu3O7-d films

Fundamental issues in finite element analyses of localization of deformation

A non-linear finite element approach for the analysis of mode-I free edge delamination in composites

Magnetic field effects on switching noise in a quantum point contact

Spontaneous resistance switching and low-frequency noise in quantum point contacts

An Experimental Study of Shear Fracture and Aggregate Interlock in Cementbased Composites

In the present paper the results of an exploratory study with the recently developed biaxial tension/shear apparatus of the Stevin Laboratory of Delft University of Technology are presented. The apparatus is unique in the sense that square double-edgenotched concrete plates up to a size of 200 x 200 mm can be loaded in any combination of tension...