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Small particle erosion of coated and uncoated electro-optical materials
Author(s): Rachel Waxman; W. Howard Poisl; Ibrahim Guven
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Paper Abstract

In this study, effects of coating material and thickness on damage characteristics of an electro-optical material impacted by small particles have been investigated. Six distinct sample types were prepared: (1) multispectral zinc sulfide (MS-ZnS), (2) MS-ZnS with rain erosion protection (REP), (3) MS-ZnS with thin durable antireflection coating (DAR), (4) MS-ZnS with thick DAR, (5) MS-ZnS with REP and thin DAR, and (6) MS-ZnS with REP and thick DAR. The samples were subjected to impact by glass spheres of diameter ranging from 150 micrometers to 700 micrometers at velocities ranging from 40 m/s to 200 m/s. The impact events were captured using two high-speed cameras at a rate of 125,000 frames per second. Taking advantage of the transparency of the samples, one camera captured the impact events from a vantage point normal to the impacted plane, on the other side of the impacted face. The other camera captured the events from a side view. Using the synchronized footage from both cameras, impact sites were paired with the impacting spheres and their velocities were measured. Nearly two hundred impacts were analyzed. The analysis included optical and scanning electron microscopy. Through the characterization effort, impact pit diameter, lateral crack diameter, and radial cracks lengths were measured. When coatings were present, delamination and peeling of the coatings were quantified. The trends in damage morphologies as functions of impacting sphere diameter and inbound velocities were explored. Thresholds for lateral and radial cracking phenomena were identified. The measurements were compared against theoretical values from indentation theory.

Paper Details

Date Published: 13 May 2019
PDF: 13 pages
Proc. SPIE 10985, Window and Dome Technologies and Materials XVI, 109850A (13 May 2019); doi: 10.1117/12.2518525
Show Author Affiliations
Rachel Waxman, Virginia Commonwealth Univ. (United States)
W. Howard Poisl, Raytheon Missile Systems (United States)
Ibrahim Guven, Virginia Commonwealth Univ. (United States)


Published in SPIE Proceedings Vol. 10985:
Window and Dome Technologies and Materials XVI
W. Howard Poisl, Editor(s)

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