microcrack


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microcrack

A linear defect in the calcified layer of articular cartilage.
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Finally, it also occurs via microcracks in the matrix that result from swelling of the natural fibers [14].
In order to study the cause of nonlinear effects manifestation during the flow of Newtonian and non-Newtonian fluids in microcrack, stationary and non-stationary fluids flow in plane-parallel and plane radial cracks the experimental investigations were conducted at the unit allowing creation of the plane and radial cracks with different opening [8-10].
They found microcracks were significantly more likely to initiate but not necessarily to propagate.
That means that there are smaller microcracks in the cement matrix of specimens with NST additive.
26) Increased osteocyte apoptosis with glucocorticoid therapy causes disruption of the canalicular system resulting in the failure to detect microcrack signaling and subsequent repair.
i) the samples are considered to be statistically uniform and microcracks of various sizes are distributed in a statistically uniform way within them; (ii) the volume of every sample is sufficiently large to accommodate several elements of equal volume each of which is sufficiently large to contain a representative sample of microcracks; (iii) there is no interaction between microcracks so that the stress fields surrounding the microcracks are mutually independent; (iv) the strength of each volume element is determined by the level of stress required to extend the weakest microcrack within it (this will usually be the largest microcrack); (v) the strength of the total sample is determined by the strength of the weakest (largest) microcrack within it.
The presence of microcracks in the multifield model, represented by the additional field d, can then be interpreted as a disturbance spread along the bar that, different from the classical continuum, alters the shape of travelling waves, depending on the microcrack density.
Any one microcrack alone is not enough to cause a stress fracture.
He begins by describing osteoporosis, how it begins and progresses, and the conditions and injuries it causes, then examines BMUS ("the microcrack fixers"), the relationship between menopause and bone loss, the work of the bone-anabolic PTHs and how they might stimulate bone growth, the possibilities of the osteogenic growth peptide and the stains, the nature of surface signaling steroids, whether as real anabolics or pseudo-anabolics, and the possible contributions of strontium.
It's subjected to impact and thermal shock, all of which combines to produce a microcrack in the coating.
Lawn et at (5) showed that for these materials, during Hertzian contact, deformation occurs in the form of an expanding microcrack damage zone instead of the usual single propagating microcrack for common brittle ceramics On this context, these glass ceramics materials appear to be a candidate material for fabricating dental restorations, as the main problem of all the dental ceramics is the premature failure during in vivo operational conditions due to the presence of surface flaws or cracks resulting during complex CAD/CAM operation (4) Thompson et al (6) shows that Coming MGC is superior in terms of hardness and fracture toughness than Vita mark II which is mainly a dental porcelain, another leading material for dental use.
In a simple model the microcrack is described as a flat, rotation symmetric surface, a so-called penny-shaped crack.