Project summary The objective of this research proposal is to develop a computational framework that can be used to understand the failure behavior or polymer coating materials subjected to cavitating environments. The effects of elastomer chemistry, chain length, and cross linking will be studied with all-atom and coarse-grained molecular dynamics simulations. From these simulations, the homogenized material response will be used to calibrate viscoelastic constitutive relationships for finite element simulation of stress evolution in a coating subject to a micro-impact event. The effectiveness of introducing micron-scale structure in the coating through additive manufacturing and incorporation of micro-inclusions will also be investigated. This research will attempt to answer the following questions: 1) How can materials be tailored to optimize the time scale for stress relaxation and can the energy dissipated during this relaxation be increased without melting the material? 2) From the continuum-scale, what viscoelastic behavior or distribution of material properties is optimal for dissipation? This proposal is innovative and significant because it will advance the state-of-the-art in computational design of materials, and develops new coarse-grained methods for predicting polymer behavior at extreme loads. The outcomes of this project will help future designers develop lighter, stronger, and multifunctional polymer materials to meet future Navy requirements. Furthermore the new methodologies and numerical tools resulting from this work can be more broadly used to design new damage and wear resistant coatings across a wide spectrum of applications.
|Effective start/end date||7/30/13 → 6/30/15|
- DOD-NAVY: Office of Naval Research (ONR): $140,000.00