Damage resulting from single and multiple waterdrop impacts on coated and uncoated LWIR substrates

Lee M. Goldman; P. E. Cremin; T. E. Varitimos; Randal W. Tustison

doi:10.1117/12.130800

14 December 1992 Damage resulting from single and multiple waterdrop impacts on coated and uncoated LWIR substrates

Lee M. Goldman, P. E. Cremin, T. E. Varitimos, Randal W. Tustison

Proceedings Volume 1760, Window and Dome Technologies and Materials III; (1992) https://doi.org/10.1117/12.130800
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

The amount and type of damage a sample receives during waterdrop impact experiments depends not only on the size and impact velocity of the waterdrop, but also on the microstructure of the underlying substrate, and its impact history. The geometry of the ring fractures resulting from single impacts is strongly affected by the morphology (i.e. grain size and orientation) of the substrate material. Furthermore, repeated impacts on or near previously impacted sites will create damage which depends not only on the morphology of the substrate material, but also on nature of the previous damage. Impact resistance refers to a previously unimpacted samples ability to withstand damage from individual waterdrop impacts. Durability refers to a samples ability to withstand extended exposures to high speed rain fields. Rain protective coatings can be applied to substrates to significantly enhance their survivability. Coating have been shown to increase a substrate's Damage Threshold Velocity (DTV) and to significantly reduce the cumulative damage that samples receive during prolonged exposures to high speed rain fields.

Citation Download Citation

Lee M. Goldman, P. E. Cremin, T. E. Varitimos, and Randal W. Tustison "Damage resulting from single and multiple waterdrop impacts on coated and uncoated LWIR substrates", Proc. SPIE 1760, Window and Dome Technologies and Materials III, (14 December 1992); https://doi.org/10.1117/12.130800

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