HYPERVELOCITY IMPACT CRATER MEASUREMENT METHODS AND ACCURACIES
Abstract
Use has been made of cavities, machined in a typical hypervelocity impact target material, to evaluate methods used to measure volumes, depths, and diameters of impact craters. Depth and diameter measurement techniques in use have been found to produce errors, typically, of 0.1 and 0.5%, respectively. The liquid metering method of volume measurement has been found to produce large errors (7 to 44%) when applied in conjunction with the saturation wetting which is common. Wall coating and selective adjustment of wetting properties of the filling agent have been shown to provide effective means for minimizing meniscus errors; errors smaller than two percent result in cases where diameter is 0.5 in. or more and total volume exceeds 0.06 cc. The latter technique is inapplicable to accurate measurement of the volumes of small craters (diameters of 0.3 in. or less) wherein capillarity predominates; machining away of crater lips and metering level full produces more satisfactory results.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0482376
Entities
People
- J. J. Payne
- P. L. Clemens
Organizations
- Arnold Engineering Development Complex