The paper investigates the effect of the biaxial loading on crack deflection/ penetration at a bi-material ceramic interface. A biaxially loaded geometry was numerically investigated using Finite Element Analysis in order to determine the energy release rate. The obtained results could be used in conjunction with a fracture criteria at interface for estimating the path of the crack after the interface was reached.

In order to discuss the transport mechanisms in cracked concrete, a small workshop was organised in the framework of the bilateral scientific cooperation between the Magnel Laboratory for Concrete Research, Ghent University, Belgium and the Department of Strength of Materials of the Polytechnic University of Timisoara, Romania. In this research project, the influence of crack formation on chloride penetration in reinforced concrete was studied experimentally

This paper presents a classification of repeated impact tests, and starting from this a series of parameters used for durability estimation will be analyzed. The high number of parameters used by different authors creates difficulties in comparison the different laboratories results. The importance of the shape and dimensions of specimens, and the stiffness of bearing are highlighted. In order to avoid these influences the authors proposed an experimental

This paper presents a methodology to study the fatigue strength of shafts under repeated impacts. The equipment for repeated impacts was designed for torsion tests of shafts for the same loading conditions as in service. The stress concentration effect, due to a fillet radius between square and circular cross-sections of the axle, was emphasized. Five groups of shafts with radius between 0.5 and 3.2mm from a number of 100 shafts with different notch

Stress intensity factors for a kinked crack originating at interface of two bonded dissimilar materials subjected to normal tension are found by the finite element method.

The problem of the small-scale yielding plane-strain asymptotic fields for the interfacial free-edge joint singularity is examined in detail, and comparisons are made with the interfacial crack tip. The geometries are idealized as isotropic elasto-plastic materials with Ramberg-Osgood power-law hardening properties bonded to a rigid elastic substrate. The resulting fields are shown to be singular and are presented in terms of radial and angular distributions

The problem of the small-scale yielding (SSY) plane-strain asymptotic fields for the interfacial free-edge joint singularity is examined in detail and comparisons are made with the interfacial crack tip. The geometries are idealised as isotropic elasto-plastic materials with Ramberg-Osgood power-law hardening properties bonded to a rigid elastic substrate. A fourth-order Runge-Kutta numerical method provides solutions to fundamental equations of

In this paper, complex stress intensity factors (SIFs) at an interface crack are determined for a range of applied loads, crack lengths and remote mode mixes using automated photoelasticity. The specimen geometries comprise epoxy resin and aluminium alloy halves bonded together, and are loaded in either compact tension in mixed-mode conditions or in three-point bend under mode I conditions. In the experiments, full-field isochromatic data were obtained

An investigation is presented on the suitability and accuracy of a thermoelastic technique for the analysis of fatigue cracks. The stress intensity factor ranges DeltaK(I) and DeltaK(II) are determined from thermoelastic data recorded from around the tip of a sharp slot in a steel specimen under biaxial load, in order to assess the accuracy of the technique. DeltaK(I) and DeltaK(II) are determined to within 4% and 9% of a theoretical prediction,

The utilisation of infra-red detectors is presented for determination the mixed mode stress intensity factors. The methodology involves the thermoelastic stress analysis using focal plane array thermal detectors, as DeltaTherm system. The range of the mixed mode stress intensity factors are obtined by fitting the equations describing the stress field around the crack tip, based on Muschelishvili's approach to the thermoelastic data. The thermoelastic