Creep rupture of fiber bundles: A molecular dynamics investigation
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
The creep deformation and eventual breaking of polymeric samples under a constant tensile load F is investigated by molecular dynamics based on a particle representation of the fiber bundle model. The results of the virtual testing of fibrous samples consisting of 40000 particles arranged on Nc=400 chains reproduce characteristic stages seen in the experimental investigations of creep in polymeric materials. A logarithmic plot of the bundle lifetime τ versus load F displays a marked curvature, ruling out a simple power-law dependence of τ on F. A power law τ∼F-4, however, is recovered at high load. We discuss the role of reversible bond breaking and formation on the eventual fate of the sample and simulate a different type of creep testing, imposing a constant stress rate on the sample up to its breaking point. Our simulations, relying on a coarse-grained representation of the polymer structure, introduce new features into the standard fiber bundle model, such as real-time dynamics, inertia, and entropy, and open the way to more detailed models, aiming at material science aspects of polymeric fibers, investigated within a sound statistical mechanics framework.
Originalsprog | Engelsk |
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Artikelnummer | 022405 |
Tidsskrift | Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) |
Vol/bind | 92 |
Udgave nummer | 2 |
ISSN | 1539-3755 |
DOI | |
Status | Udgivet - 10 aug. 2015 |
Eksternt udgivet | Ja |
ID: 170017231