Considering the linear constitutive model containing fractional integrals and Riemann-Liouville derivatives, power per unit volume is expressed in time domain terms of stored energy dissipated volume. Relaxation modulus creep compliance corresponding to anti-Zener Zener models are calculated restrictions on parameters narrowing thermodynamical constraints posed order ensure relaxation be comple...

The mathematical model of the distribution of deformation-relaxation and heat-mass fields in capillary-porous materials with fractal structure in the process of drying wood is regarded in the article. We used differential equations in partial derivatives of fractional order in description of this model. To describe the creep of wood fractional exponential Rabotnov’s function was used. The numer...

The role of intakes in deformation twiming of Iamellar TiAl (ywl~l (a*) crystals creep deformed at an ekvated temperature have been investigated. Since the multiplication of lattice dislocations within both y and etzlamellae is very limited as a result of a refined lamekr microstmture, the gliding of interfheii dislocations on both y/a2 and y/y interfaces (i.e. interface sliding) becomes an imp...

We have tested the mechanical properties of isolated canine pericardium at 37°C in Hanks' solution, and compared those results with similar tests on tissue at room temperature, both in Hanks' solution and merely kept moist with saline. Pericardium, which is nearly isotropic due to the layers of collagen aligned in different directions, is a composite material made up of collagen and elastin fib...

PURPOSE During the last decades, derivatives and integrals of non-integer orders are being more commonly used for the description of constitutive behavior of various viscoelastic materials including soft biological tissues. Compared to integer order constitutive relations, non-integer order viscoelastic material models of soft biological tissues are capable of capturing a wider range of viscoel...

A temperature and rate-dependent crystal plasticity framework has been used to examine the temperature sensitivity of stress relaxation, creep and load shedding in model Ti-6Al polycrystal behaviour under dwell fatigue conditions. A temperature close to 120°C is found to lead to the strongest stress redistribution and load shedding, resulting from the coupling between crystallographic slip rate...

Stress relaxation experiments are reported that culminate in energetic failure in rocks analogous to the loading cycle and subsequent localization or reactivation on brittle faults embedded in an elastic medium. Universally, rapid primary deformation arrests and transitions into a long secondary deformation phase that ultimately accelerates to catastrophic rupture. Primary deformation (u) confo...

In this work, a fully three-dimensional constitutive model suitable for the macroscopic description of unidirectional fibre-reinforced composites where the matrix exhibits a time-dependent viscoelastic behaviour is developed. Specifically, we consider a coordinate-free formulation where the stress and strain fields can be decomposed into fibre-directional and volumetric parts on the one hand, a...

Measurements of the relaxation rate QsT d of superconducting currents have been performed on a carefully selected set of dirty and clean high-Tc superconductors for temperatures T down to 100 mK and magnetic fields up to 7 T. The extrapolated relaxation rates Qs0d for the dirty compounds indicate that the viscosity experienced by a tunneling vortex segment is grossly underestimated by the stand...