Accession Number : ADA114018

Title :   Liquid Impact Erosion Mechanisms in Transparent Materials.

Descriptive Note : Interim rept. 30 Sep 80-30 Sep 81,


Personal Author(s) : Zwaag,S van der ; Field,J E

PDF Url : ADA114018

Report Date : Mar 1982

Pagination or Media Count : 57

Abstract : This project has been concerned with developing techniques for the study of liquid impact, with studying the behaviour of various infra-red transparent solids and with analytic work on hard coatings. Damage has been assessed quantitatively by measuring the 'residual' strength after impact and plotting strength against velocity. Section 2 of this report describes an analysis of residual strength curves. The comparison between the analytic predictions and the experimental curves is good. Sections 3 and 4 describe the results of finite element analysis for the case of (i) Hertzian and (ii) uniform pressure loading of substrates with a hard coating. The protection offered by the coating is examined in terms of the elastic properties of the coating and its thickness. (Author)

Descriptors :   *Infrared optical materials, *Optical glass, *Impact tests, *Liquid jets, *Erosion, *Coatings, Fracture(Mechanics), Modulus of elasticity, Transparence, Damage assessment, Finite element analysis, Hardening, Strength(Mechanics), Thickness, Zinc sulfides, Mathematical prediction

Subject Categories : Ceramics, Refractories and Glass
      Coatings, Colorants and Finishes
      Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE