Tone Burst Eddy current Thermography (TBET) is a new hybrid, non-contacting, nondestructive evaluation method with a wide range of applications including aircraft. Aircraft can have structural cracks or other defects which can lead to failure. The safe life of structural members can be evaluated by determining the size and orientation of critical cracks. For understanding cracks, fundamental kn...

We present an experimental study of the dynamics of rapid tensile fracture in brittle amorphous materials. We first compare the dynamic behavior of “standard” brittle materials (e.g. glass) with the corresponding features observed in “model” materials, polyacrylamide gels, in which the relevant sound speeds can be reduced by 2-3 orders of magnitude. The results of this comparison indicate unive...

0026-2714/$ see front matter 2012 Elsevier Ltd. A http://dx.doi.org/10.1016/j.microrel.2012.06.140 ⇑ Corresponding author. E-mail address: [email protected] Through-silicon vias (TSVs), being one of the key enabling technologies for three dimensional (3D) integrated circuit (IC) stacking, silicon interposer technology, and advanced wafer level packaging (WLP), has attracted tremend...

SiC/SiC composites are studied for their potential use in the next generation of nuclear reactors. A multiscale approach is under development to construct a predictive modelling of their complex damageable mechanical behaviour due to their heterogeneous microstructure. This paper focuses on the damage characterisation of the composite at the scale of the tow at room temperature, both in terms o...

This paper presents an overview of our recent enhanced 3D extended finite element toolkit for Abaqus (XFA3D) for fatigue damage assessment of welded aluminum structures under block loading. To alleviate the computational burden associated with the insertion and propagation of arbitrary cracks in the presence of a welding induced residual stress field, a nodal enriched displacement field coupled...

THE ACTIVATION energy for dislocation nucleation from a stressed crack tip is calculated within the Peierls framework, in which a periodic shear stress vs displacement relation is assumed to hold on a slip plane emanating from the crack tip. Previous results have revealed that the critical G (energy release rate corresponding to the “screened” crack tip stress field) for dislocation nucleation ...

the cracked brazilian disc (cbd) specimen is widely used in order to determine mode-i/ii and mixed-mode fracture toughness of a rock medium. in this study, the stress intensity factor (sif) on the crack-tip in this specimen is calculated for various geometrical crack conditions using the extended-finite element method (x-fem). this method is based upon the finite element method (fem). in this m...

Automatic crack identification for pipeline analysis utilizes three-dimensional (3D) image technology to improve the accuracy and reliability of identification. A new technique that integrates a deep learning algorithm 3D shadow modeling (3D-SM) is proposed automatic corrosion cracks in pipelines. Since depth below surrounding area crack, projected when exposed under light sources. In this stud...