In this study the authors propose to take into account nonlinear effects induced by presence of a transverse crack carry out vibratory monitoring and detect cracks in rotating systems subject model uncertainties. More precisely, we focus more particularly on global complexity dynamic behaviour cracked rotors evolution their harmonic components as function parameters breathing (its position dept...

The shaping of dispersion characteristics in a variant of disc-loaded circular waveguide was studied through electromagnetic analysis for assessing the structure for wideband coalescence of the beamand waveguide-mode dispersion characteristics that entails the wideband gyro-travelling-wave tube (gyro-TWT) performance. In this variant of disc-loaded circular waveguide, the alternate dischole rad...

A hybrid finite-discrete element method (FDEM) is proposed to model rock fracture initiation and propagation during a three-point bending test under quasistatic dynamic loading conditions. Three models have been implemented in the FDEM transition from continuum discontinuum through fragmentation. The rate effect on behaviour has taken into account by implementation of relationship between stati...

A multiscale (micro-macro) approach is proposed for the establishment of the full thermal and induced stress fields in cracked composites that are subjected to heat flow. Both the temperature and stresses distributions are determined by the solution of a boundary value problem with one-way coupling. In the micro level and for combined thermomechanical loading, a micromechanical analysis is empl...

In this paper, several transversely cracked RC beams, self-anchored in a three-point bending mode, were prepared and subjected to NaCl solution drying–wetting cycles. Based on two experimental results obtained after 15 and 30 cycles, respectively, the profiles of free chloride concentration at different sections of sound and cracked concretes were presented and analyzed. The depth of surface co...

PURPOSE To provide an overview of the clinical features, diagnosis, classification and management of cracked teeth which may be a diagnostic challenge in clinical practice. RESULTS Cracks may initiate from coronal tooth structure or from within the root and affect healthy or root treated teeth. There are many terminologies and classifications in the literature for cracked teeth that can be as...

BACKGROUND To assess the prevalence and factors associated with the occurrence of cracked nipples in the first month postpartum. METHODS This was a cross-sectional study nested in a cohort of mothers living in Feira de Santana, state of Bahia, northeastern Brazil. Data from 1,243 mother-child dyads assessed both at the maternity ward and 30 days after delivery were analyzed. The association b...

Background: A cracked tooth may be challenging for dentists because it may present with varied intensities, may be asymptomatic, and may still not be clinically visible. The transilumination method can facilitate diagnosis and ensure appropriate treatment in such cases. The aim of the present article was to report a clinical case of an anterior cracked tooth with a nonesthetic class IV restorat...

Based on the reference stress approach, two sets of the crack opening displacement (COD) estimation equations are proposed for a complex cracked pipe. One set of equations can be used for the case when full stressstrain data are known, and the other for the case when only yield and tensile strengths are available. To define the reference stress, a simple plastic limit analysis for the complex c...

Studying the dynamic properties of rocks in complex environments is great significance to sustainable development deep-sea metal mineral resource extraction. To investigate influence dry–wet cycles on tensile and energy dissipation red sandstone, a series Brazilian disc tests was carried out through split Hopkinson pressure bar (SHPB) apparatus. The behaviors distribution sandstone specimens af...