Simulating stochastic and additively manufactured foams at large strains and high strain rates (Progress Summary)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Understanding the mechanical response of polymer foams is essential in developing system material models and in designing replacements for legacy pads and cushions. Simulations can help elucidate structure-property relationships and compare local stress distributions to understand aging behavior and improve designs. In many applications, these materials experience significant loadings and computations need the capability to reproduce those conditions. We are applying are previously developed material point method (MPM) simulation capability to understand the aging properties of loaded direct ink write resins. Significant particle loading of a stiffer material in siloxane networks exhibit different compression set behavior than unloaded specimens. We are applying our computational mechanics capabilities to understand this difference at the continuum level. Figure 1 highlights preliminary results, depicting renderings of an unloaded DIW filament alongside one containing a 20% volume loading of spherical particles. Also, the stress distribution of a neat filament at 20% compression is shown. We are planning to study this behavior for a range of loading fractions, particle sizes, and material stiffness ratios. We will explore the sensitivity of the stress response to these variables which could inform aging models of these materials.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1548377
- Report Number(s):
- LLNL-TR-768540; 959401
- Country of Publication:
- United States
- Language:
- English
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Progress Summary: Simulating stochastic and additively manufactured foams at large strains and high strain rates
Simulating stochastic and additively manufactured foams at large strains and high strain rates