The development of protective elastomeric coatings for marine equipment subjected to erosive cavitating flows is hindered by the lack of physics-based models that can predict or explain the wide variation of performance exhibited by different coating materials. To address this shortcoming, the development of a multiscale erosion model for elastomeric coatings is proposed that can incorporate polymer structure, substrate composition and polymer/substrate interfacial chemistry, to predict the performance and durability of coatings subject to intense hydrodynamic loads such as shock waves generated from bubble collapse in cavitating flows. The primary objective of this research is to explain the wide range of performance exhibited by differing elastomer coatings, and provide a tool for the design of more resistant coatings. In the proposed method, the mechanical response of different elastomer materials will be modeled by a new method of coarse-grained molecular dynamics that enables simulation at strain rates comparable to that from bubble collapse. The elastomer response can be characterized across a range of impact load intensities and homogenized into a physically-based continuum constitutive relationship. This homogenized response can then be incorporated into micromechanics based simulations of single bubble collapse so that propagation of bubble collapse-induced shock can be modeled through the coating, and the resulting destructive energy transferred to the substrate can be quantified and compared with other coatings. A final aspect of the investigation is a coupled atomic-to-continuum model of the substrate to coating interface to determine the coating bond strength as a function of the type of chemical interactions at the interface.
|Effective start/end date||4/1/12 → 9/30/13|
- DOD-NAVY: Office of Naval Research (ONR): $129,750.00
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