28 May 2015 Peridynamic modeling of damage and fracture in EM windows and domes
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Abstract
The brittle nature of electromagnetic (EM) window and dome materials limits electrical and magnetic performance due to impact of sand particles, hailstones and raindrops. The damage and fracture patterns due to such impacts are well documented with distinct association to the impact type. However, the underlying mechanisms that lead to those patterns are not well understood. Adding to the complexity, multiple layers of coatings with varying thicknesses are applied to the external surfaces of these structures, which affects the extent and nature of the impact damage. A physics -based analysis method that captures correct damage and fracture patterns due to particle impact is well warranted.

In this paper, Peridynamic (PD) Theory is demonstrated as a simulation methodology for fracture analysis of EM windows and domes under particle impact. This theory involves reformulation of classical continuum mechanics in integral form (no spatial derivatives), alleviating the stress singularity problem common to previous fracture analysis approaches. The PD theory enables accurate description of failure events via natural generation and accumulation of defects, cracks, and damage; it can capture complex, 3-D and multiple non-coplanar crack initiation and propagation. The fracture behavior of materials is influenced by an important material parameter, critical stretch, which is specific to PD theory. This study offers a combined experimental-computational method to extract the critical stretch parameter for glass and ceramic materials based on simulations of indentation tests. The critical stretch parameter extracted from indentation simulations is subsequently used for simulations involving sand impact. The predicted damage field is in very good agreement with the experimentally observed fracture patterns.
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Ibrahim Guven, Ibrahim Guven, Brian J. Zelinski, Brian J. Zelinski, } "Peridynamic modeling of damage and fracture in EM windows and domes", Proc. SPIE 9453, Window and Dome Technologies and Materials XIV, 94530V (28 May 2015); doi: 10.1117/12.2202309; https://doi.org/10.1117/12.2202309
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