Computational modeling of polymer composites : a study of by Samit Roy

By Samit Roy

''This booklet presents a greater figuring out of the theories organization with finite point versions of elastic and viscoelastic reaction of polymers and polymer composites. according to the authors unique paintings within the topic zone over the past 3 many years, it covers computational modeling of polymers and polymeric composites. It starts off with a assessment of mathematical preliminaries, equations of anisotropic elasticity, Read more...

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Extra resources for Computational modeling of polymer composites : a study of creep and environmental effects

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Do not overlap), and their sum is the total boundary Γ. Let u be the displacement vector corresponding to the equilibrium configuration of the body, and let σ be the Cauchy stress tensor and ε be the strain tensor. The set of admissible configurations is defined by sufficiently differentiable functions that satisfy the geometric boundary ˆ on Γu . conditions u = u If the system is in equilibrium, then of all admissible configurations, the actual one corresponding to the equilibrium configuration makes the total virtual work done zero.

N = 3) in a plane and a typical displacement component varies between any two points according to ueh (x) = ce1 + ce2 x + ce3 y. 2 uniquely along any of the three segments. 2 shows linear triangular and rectangular elements with the two displacement degrees of freedom (ujx , ujy ) at the nodes. u 3y u3y 3 u 4y u 2y u x3 2 4 u x2 u1y u x4 u 2y u 2y u1y 1 2 1 u1x (a) u x3 3 u x2 u1x (b) Fig. 3 (b) Rectangular Virtual Work Statement The 2n nodal values (ujx , ujy ), j = 1, 2, · · · , n, in Eq. 11) must be determined such that the approximate solution (ueh , vhe ) satisfies the dynamic version of the principle of virtual displacements over the element Ωe .

40) separates the strain into the part that would occur if the total stress σ(t) were applied at time t and additional strain produced due to creep. It is possible to include the initial part due to σ0 into the integral. For example, Eq. 41) 24 EQUATIONS OF SOLID MECHANICS The fact that D(t) = 0 for t < 0 is used in writing the above integral, which is known as Stieljes integral. Arguments similar to those presented for the creep compliance can be used to derive the hereditary integrals for the relaxation modulus Y (t).

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