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Proceedings Paper

Multiple Impact Jet Apparatus (MIJA): Application To Rain Erosion Studies
Author(s): P. N. H. Davies; J. E. Field
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Paper Abstract

The advantages of jet methods over other forms of impact, for single impact studies, have been well documented. The recent development of a multiple jet impact apparatus (MIJA) at the Cavendish Laboratory now allows us to study multiple impact in a controlled way. Using the same nozzle design as the previous single impact devices, MIJA produces jets by pneumatically accelerating a titanium shaft into the rear water chamber of the nozzle. The shock-accelerated jets are of the high quality (spherically fronted, symmetrical and with a coherent core) necessary for simulating 2 to 10 mm diameter drop impact. Impact velocities in the range up to ca. 250 m s-1 have been achieved. A major advantage of the equipment is that the velocity and position of impact of each jet can be controlled and repetition rates of ~10 min-1 can be maintained for extended periods of time. Computer control is used to ensure that the chosen impact velocity is maintained; to control the specimen position (single site or linear and random arrays are possible) and to maintain an accurate impact record. The first part of the paper describes the design, construction and performance of MIJA. The final sections present experimental data, for a range of "window" materials, on threshold velocities and damage development.

Paper Details

Date Published: 11 September 1989
PDF: 14 pages
Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); doi: 10.1117/12.960790
Show Author Affiliations
P. N. H. Davies, University of Cambridge (England)
J. E. Field, University of Cambridge (England)

Published in SPIE Proceedings Vol. 1112:
Window and Dome Technologies and Materials
Paul Klocek, Editor(s)

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