Accession Number : ADA255426


Title :   Strain-Rate Effects in Replica Scale Model Penetration Experiments


Descriptive Note : Interim rept. Jul 1991-Apr 1992


Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX


Personal Author(s) : Anderson, Jr , Charles E ; Mullin, Scott A ; Kuhlman, Chris J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255426.pdf


Report Date : 17 Aug 1992


Pagination or Media Count : 33


Abstract : A computational study has been performed to quantify the effects of strain rate on replica-model (scaled) experiments of penetration and perforation. The impact of a tungsten-alloy long-rod projectile into an armor steel target at 1.5 km/s was investigated. It was found that over a scale factor of 10, strain-rate effects change the depth of penetration, for semi-infinite targets, and the residual velocity and length of the projectile, for finite- thickness targets, on the order of 5%. Although not modeled explicitly in the present study, the time-dependence of damage was examined. Damage accumulation is a strong function of absolute time, not scaled time. At homologous times, a smaller scale will have less accumulated damage than a larger scale; therefore, the smaller scale will appear stronger, particularly in situations where the details of damage evolution are important.


Descriptors :   *NUCLEATION , *PENETRATION , *TUNGSTEN ALLOYS , FUNCTIONS , SIMULATION , ARMOR , THICKNESS , IMPACT , ALLOYS , DEPTH , STRAIN RATE , TUNGSTEN , ACCUMULATION , REPLICAS , RODS , LENGTH , SCALE , RESIDUALS , MECHANICS , TIME , PERFORATION , STEEL , TARGETS , DAMAGE , TIME DEPENDENCE , MODELS , PROJECTILES , RATES


Subject Categories : Ammunition and Explosives


Distribution Statement : APPROVED FOR PUBLIC RELEASE