INDEX stress rupture

PCA fibres, in one way or another, bear mechanical load in real service conditions. That is why, strength indexes and, in the first place, rupture stress and extension are of great... 

Fibres, containing derivatives of bis-aroilenbcnzimidazole, were subjected to ultra-violet light action of the lamp PRK-2. Mechanical properties of the fibres were determined depending on cross section area. Value of rupture stress (o) is the mean value of true rupture stress obtained from indexes of tearing machine. 

Stress induced by high refractive index contrast has been reported to cause the rupturing of the structure (Pavesi and Turan 2010). The stresses are often capillary stresses caused by the evaporation of the electrolyte/rinsing solution. Hence, the quality of the multilayer can be improved by improving drying techniques (see handbook chapter Drying Techniques Applied to Porous Silicon ). 

Creep is the change in shape of a material while subject to a stress it is time-dependent. Elasticity, the ability of a fiber to return to its original dimensions upon release of a deformation stress, is described by the tenacity of the 5deld point on the stress-strain curve. Toughness, the ability of a fiber to absorb work before it ruptures, is evaluated from the area under the total stress-strain curve. The toughness index is defined as one-half the product of the stress and strain at break... 

Now, one can express the kinetic condition of rupturing an individual bond as Uq-AUq = Vb h-kr ln(tfj/to), where the index fr (fracture) implies that the critical average time needed for the bond rupture at a given temperature due to a given stress has been reached. Consequently, tf describes bond durability. By carrying out a transformation from In to exponent, one obtains... 

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