1 TRACT erimental results obtained during fatigue testing of a lded lap-shear structural-joint specimen are d. In these experiments, the electro-mechanical mpedance technique was used for structural health ing, damage detection, and NDE. The test ns were instrumented with piezo-electric wafer ers, and the base E/M impedance signature was over the relevant frequency range. Fatigue testing lied t...

Two different optical configurations were developed and are described. The first is a laser profiling system that is used for transverse profile acquisition for rut detection purposes. The second uses an autosynchronized laser scanning sensor for crack detection Both these systems have been installed on inspection vehicles and have been tested. Tests have shown results that have a very good cor...

A novel method for preparing and testing bending specimens in-situ the TEM has been developed. This method provides high visibility of the crack front and its associated plastic zone. This is significant because energy release rates can now be calculated at many points throughout the test based on crack tip opening displacement (CTOD), crack opening angle (COA), and crack advance. Further refin...

In this work, the plastic deformation mechanisms responsible for mechanical properties and fracture toughness in nanotwinned (NT) magnesium is studied by molecular dynamics (MD) simulation. The influence of twin boundary (TBs) spacing and crack position on deformation behaviors are investigated. The microstructure evolution at the crack tip are not exactly the same for the left edge crack (LEC)...

The paper presents the development of an intelligent image processing algorithm capable of detecting fatigue defects from images of the rail surface. The links between the defect detection algorithm and 3D models for rail crack propagation are investigated, considering the influence of input parameters (materials, vehicle characteristics, loading conditions). The dynamic behaviour at the wheel-...

Diesel engines used in power plants and marine propulsion are especially sensitive to outage events. Any advance in the early detection of failure will increase the reliability of the electricity supply and improve its productivity by reducing costly power outages. Fault detection and diagnosis is important technology in condition-based maintenance for diesel engines. This article presents a cl...

Crack detection in pavements and objects has been a constant field of research in pavement management. Conventionally, humans were engaged to detect cracks in the pavements and they used to present report sheets based on their assessment. But, this process was a time consuming one and was costlier too. So, researchers were trying for some alternate method that would detect cracks, hence minimiz...

PURPOSE The aims of the present study were to compare the image quality and visibility of tooth cracks between conventional methods and swept-source optical coherence tomography (SS-OCT) and to develop an automatic detection technique for tooth cracks by SS-OCT imaging. METHODS We evaluated SS-OCT with a near-infrared wavelength centered at 1,310 nm over a spectral bandwidth of 100 nm at a ra...

Most crack-detection methods adopt a pixel-level segmentation-based approach, which requires considerable time and complexity to detect the pixel area of crack. Unlike in this paper, authors proposed an AugMoCrack network, bounding box-level crack detection approach for weakly supervised achieved by augmenting training data with Poisson blending, as well high-frequency discrete cosine transform...

Surface cracks are typical defects in high-speed rail (HSR) slab tracks, which can cause structural deterioration and reduce the service reliability of track system. However, question how to effectively detect quantify surface remains unsolved at present. In this paper, a novel crack-detection method based on infrared thermography is adopted rail-track slabs. method, thermogram acquired by an c...