Modulus continued time-dependent

Creep modulus A measure of the continued, time-dependent strain for a constant applied stress. 

Thus, the center deflection of the beam is a product of the maximum stress at the outer elements of the beam, and at the center a geometrical term (L / 6h)) divided by Young s modulus E(i), which is now time-dependent because of the viscoelastic relaxations in the beam, and decreases with time under stress as additional inelastic strains build up. However, the stresses in the viscoelastic beam continue to remain unaltered since they depend only on the applied forces and moments, which remain constant. 

The total resilient modulus is calculated using total recoverable deformation, which includes both the instantaneous recoverable and the time-dependent continuing recoverable deformation during the rest period portion of one cycle. 

Dependence of relaxation modulus upon time for linear continuous line] and cross-linked broken line) polymers, showing four regions of viscoelastic behavior... 

Chain stretching is governed by the covalent bonds in the chain and is therefore considered a purely elastic deformation, whereas the intermolecular secondary bonds govern the shear deformation. Hence, the time or frequency dependency of the tensile properties of a polymer fibre can be represented by introducing the time- or frequency-dependent internal shear modulus g(t) or g(v). According to the continuous chain model the fibre modulus is given by the formula... 

Figure 7 shows swelling and mechanical data in dependence on concentration of acetone a in mixtures for networks A, B, C, D, E, F, G and H, cured for 0.13,3,6,12,24,48,78 and 97 days, with mole fraction Xcoo- = 0,0.0024,0.0056, 0.0100,0.0172,0.0320,0.0450 and 0.0500. For samples cured for a short time (A-C) the dependence of X on the acetone content is continuous for other gels, phase transition may be found. The extent of the collapse and also the acetone content in the mixture at which the transition takes place, ac, increase with increasing time of aging. For networks A-C, also the dependence of modulus G on a is continuous for other networks there is a discontinuity which increases with the time of curing. 

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