The scaled boundary finite element method (SBFEM) is extended for shape sensitivity analysis of stress intensity factors (SIFs) with respect to the crack geometry. The procedure combines the finite element formulations with the boundary discretization. The original equations of the SBFEM are reformulated as functions of the so-called scaling centre, synonymous to the crack tip. The variation in...

In this paper, the authors use Spatial Interaction Filters (SIF) to simulate human experts’ visual process in tracking spatial interactive objects. The algorithm includes spatial density based pixel clustering and object interaction descriptions, such as Contact Area Index (CAI) and correlation filter. The algorithm is designed to automatically track the Harmful Algae Bloom (HAB) targets. In th...

The serious adverse health consequences associated with illicit drug use in Vancouver has brought international attention to the city. It is now widely recognized that innovative and bold strategies are required to confront epidemics of drug overdose, HIV and Hepatitis C infections, and injection-related bacterial infections. The establishment of North America’s first supervised injection facil...

In this paper the axisymmetric problem on a semi-infinite cylindrical crack is considered. On the surfaces of the crack, the normal and tangential components of the traction are prescribed whereas the displacement vector components are unknown and supposed to be discontinuous. The problem is reduced to a 2 × 2 matrix Wiener–Hopf factorization. The solution is found by quadratures. Thus, this is...

Residual stresses are usually associated with induced by heterogeneous deformations as a cause of phase transition and thermal stress. The residual can appear during the manufacturing process, repair or in some cases due to operational loads. These should be taken into account structural integrity evaluation low-toughness materials case fatigue and/or stress corrosion cracking (SCC) situations....

At crack tip the stress distribution has singularities (i.e intensity is infinite) which physically impossible. Irwin realised that stresses at are finite and subsequently introduced Stress Intensify Factor(SIF). This factor used to determine this plastic zone size. The a special case of notch. Around notch, fracture needs volume develop according volumetric approach. characterised by distance ...

NASA is developing a "tool box" that includes a number of advanced structural analysis computer codes which, taken together, represent the comprehensive fracture mechanics capability required to predict the onset of widespread fatigue damage. These structural analysis tools have complementary and specialized capabilities ranging from a finite-element-based stress-analysis code for twoand three-...

We herein report an unusual CO(2) adsorption behavior in a fluoro-functionalized MOF {[Zn(SiF(6))(pyz)(2)]·2MeOH}(n) (1) with a 1D channel system, which is made up of pyrazine and SiF(6)(2-) moieties. Surprisingly, desolvated 1 (1') adsorbs higher amounts of CO(2) at 298 K than at 195 K, which is in contrast to the usual trend. Combined Raman spectroscopic and theoretical studies reveal that sl...

Introduction Satellite observations of sun-induced chlorophyll fluorescence (SIF) are increasingly considered a “probe” for photosynthesis. In recent years the emergence SIF has facilitated regional and global monitoring vegetation On one hand, there is still controversy about liner or non-linear SIF-GPP relationship whether high-temperature events will change linear relationship. other it uncl...