Accession Number : ADA260187


Title :   A Literature Survey of Airborne Vehicles Impacting with Water and Soil: Head Injury Criteria and Severity Index Development of Computer Program KRASH


Descriptive Note : Final rept. Nov 1987-May 1989


Corporate Author : LOCKHEED AERONAUTICAL SYSTEMS CO BURBANK CA


Personal Author(s) : Wittlin, G ; Gamon, M A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260187.pdf


Report Date : Jul 1992


Pagination or Media Count : 99


Abstract : This report describes a two part study to identify KRASH code requirements for analyses of: Structure/terrain interaction; Head/structure Interaction. The literature survey of water and soil impact methodology is presented. The reports are reviewed with regard to incorporation of code modifications to program KRASH. A total of 28 water impact reports were reviewed. In the area of water impact, the representation of a transport airplane lower fuselage as a wedge-shaped planing surfaced is discussed. A relationship is developed between vertical force and depth of fuselage penetration. Forty soil impact related reports were reviewed in the survey. For soil impact the two potential approaches described include: Empirical definition of soil pressure versus depth. Theoretical definition of soil as a viscoelastic medium. For the head/structure impact assessment, the Head Injury Criteria (HIC) and Severity Index (SI) calculations are added to program KRASH. The approach, equations, and flow diagrams associated with a simple, single degree-of freedom model of a mass impacting a surface with a given velocity is described.... Occupant injury assessment, HIC, SI, Water impact, Soil impact, Analysis, KRASH.


Descriptors :   *LITERATURE SURVEYS , *AVIATION ACCIDENTS , *WOUNDS AND INJURIES , *HEAD(ANATOMY) , VELOCITY , REQUIREMENTS , METHODOLOGY , AIRCRAFT , MILITARY AIRCRAFT , MODELS , INTERACTIONS , MODIFICATION , WATER , MILITARY VEHICLES , STRUCTURES , TERRAIN , DEPTH , SURFACES , PENETRATION , FUSELAGES , TRANSPORT , PRESSURE , WEDGES , LANDING IMPACT , DIAGRAMS , AVIATION INJURIES , INDEXES(RATIOS)


Subject Categories : Military Aircraft Operations
      Anatomy and Physiology
      Weapons Effects(biological)


Distribution Statement : APPROVED FOR PUBLIC RELEASE