Numerical simulations of rubber networks at moderate to high tensile strains using a purely enthalpic force extension curve for individual chains
- Los Alamos National Laboratory
We report the results of numerical simulations of random, three-dimensional, periodic, tetrafunctional networks in response to a volume-preserving tensile strain. For the intranode force, we use a polynomial fit to a purely enthalpic ab initio force extension curve for extended polyisoprene. The simulation includes a relaxation procedure to minimize the node forces and enforces chain rupture when the extension of a network chain reaches the ab initio rupture strain. For the reasonable assumption that the distribution of network chain lengths is Gaussian, we find that the calculated snap-back velocity, temperature increase due to chain ruptures and predicted tensile stress versus strain curve are consistent with experimental data in the moderate to high extension regime. Our results show that a perfect tetrafunctional polyisoprene network is extremely robust, capable of supporting tensile stresses at least a factor of 10 greater than what is observed experimentally.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 970961
- Report Number(s):
- LA-UR-09-06021; LA-UR-09-6021; JCPSA6; TRN: US201003%%305
- Journal Information:
- Journal of Chemical Physics, Vol. 131, Issue 22; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Similar Records
A new paradigm for the molecular basis of rubber elasticity
The bond rupture force for sulfur chains calculated from quantum chemistry simulations and its relevance to the tensile strength of vulcanized rubber