The dielectric relaxation modes in low bismuth doped SrTiO3 were studied at temperatures 1.5–300 K and frequencies up to 1.8 GHz. We observe two modes, at 8 K ~mode I! and 65 K ~mode V!, which also occur in single-crystalline SrTiO3. With Bi doping, two further dielectric peaks, 18 K ~mode II! and 30 K ~mode III!, are induced in both real and imaginary parts of the permittivity on the quantum p...

The interlaminar fracture toughness in pure mode II (GIIc) of a Carbon-Fibre Reinforced Plastic (CFRP) composite is characterized experimentally and numerically in this work, using the End-Notched Flexure (ENF) fracture characterization test. The value of GIIc was extracted by a new data reduction scheme avoiding the crack length measurement, named Compliance-Based Beam Method (CBBM). This meth...

A cohesive element formulation is proposed that provides a general framework to approximate experimentally measured Traction–Separation Law (TSL) shapes. Unlike other approaches, it does not assume specific TSL shapes, such as bi-linear or exponential. The shapes are defined generally, in piecewise-linear fashion, and Mode I shear (Mode II III) TSLs can have different Furthermore, added general...

The fracture mechanics examines the development and expansion of cracks in solids and how they affect the deformation of materials. The stress intensity factors at the tip of the crack and the critical stress intensity factors or fracture toughness of materials are considered in the relevant criteria. There are three main modes of applying forces to a crack including the tensile mode, shear mod...

The crack-propagation form may appear as an arbitrary mixed-mode fracture in engineering structure due to irregular internal crack. It is of great significance research the materials with cracks. coupling effect multiple variables (crack height ratio, horizontal deflection angle and vertical angle) on parameters such stress intensity factors T-stress are key points this paper. A three-point ben...

A problem of an edge crack with a fracture process zone in semi-infinite orthotropic planes under the pure- and mixed-mode loading (I II modes) was studied. cohesive different lengths opening sliding modes (multiple zone) used to simulate zone. The smooth closure condition defines two modes. that is normal plate formulated terms integral equations for unknown displacement discontinuity along cr...

Ceramic/metal interfaces were studied that fail by atomistic separation accompanied by plastic dissipation in the metal. The macroscopic toughness of the specific Ni alloy/Al2O3 interface considered is typically on the order of ten times the atomistic work of separation in mode I and even higher if combinations of mode I and mode II act on the interface. Inputs to the computational model of int...

ABSTRACT Alfven wave is the single most important physical phenomenon of magneto-hydrodynamic (MHD) turbulence and has far-reaching impact to almost all studies related astrophysical magnetic field. Yet restoration fluctuations from a given field, aka local problem, never properly addressed in literature albeit its importance. Previous works model fluctuation as perturbation along straight-line...

In this research, an efficient Galerkin Finite Volume Method (GFVM) along with the h–refinement adaptive process and post–processing error estimation analysis is presented for fracture analysis. The adaptive strategy is used to produce more accurate solution with the least computational cost. To investigate the accuracy and efficiency of the developed model, the GFVM is compared with two versio...