An Investigation Into The Aerodynamics And Structural Integrity Of The 155 Mm M898 Projectile
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An Investigation Into The Aerodynamics And Structural Integrity Of The 155 Mm M898 Projectile
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Author :
language : en
Publisher:
Release Date : 1999
An Investigation Into The Aerodynamics And Structural Integrity Of The 155 Mm M898 Projectile written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
The M898 sense-and-destroy armor (SADARM) projectile is a 155-mm counterbattery artillery projectile that ejects two submunitions against battlefield combat vehicles. The U.S. Army Armament Research, Development, and Engineering Center (ARDEC) recently funded an experiment designed to analyze the structural integrity and aerodynamic characteristics of the projectile. In particular, the experiment sought to investigate the possibility of a compromise in integrity at the base-body juncture. No evidence of this was discovered. The secondary aim of obtaining a complete set of aerodynamic coefficients for the M898 was related to recent minor design changes made to the round. The objective was to ensure that these changes did not result in a noticeable change in flight characteristics. All shots were temperature-conditioned to 120 deg F, thus providing a higher-than-normal launch Mach number. This resulted in an extension of the Mach-number regime of the existing spark range database. When compared with existing spark range data, no significant differences were noted. Aerodynamically, the M898 projectile is very similar to the M483A1. Despite a large existing aerodynamic database, three M483A1 projectiles were fired concurrently with the M898's in an effort to solidify the close comparison of the two round types. Comparison of the new M898 and M4S3A1 data confirms the aerodynamic similarity noted previously.
Analysis Of Free Flight Aerodynamic Range Data Of The 155mm M549 Projectile
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Author : United States. Army Armament Research and Development Command
language : en
Publisher:
Release Date : 1980
Analysis Of Free Flight Aerodynamic Range Data Of The 155mm M549 Projectile written by United States. Army Armament Research and Development Command and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Experimental Investigation Of Projectile Integrity While Driving Through An Axisymmetric Baffled And Railed Ram Accelerator
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Author : Chase Roumain Smith
language : en
Publisher:
Release Date : 2021
Experimental Investigation Of Projectile Integrity While Driving Through An Axisymmetric Baffled And Railed Ram Accelerator written by Chase Roumain Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Investigations of the operational envelope of a baffled and railed axisymmetric ram accelerator occasionally yield anomalous results where large pressure spikes precede a large drop in performance. Using experimentally obtained pressure data in tandem with ANSYS structural analysis modules, Finite Element Analysis (FEA) was per- formed to assess the structural integrity of the ram accelerator projectile. Utilizing pressure fields from experiments, FEA indicated that the polycarbonate sub-caliber projectiles used in these tests experience plastic deformation and compromised struc- tural integrity. Similar analysis was also conducted using a sturdier 6061 aluminum projectile which resulted in no deformation or factors of safety below 1; however, these projectiles are significantly heavier and less scientifically useful. A 2-piece shell projectile made of 7075 aluminum was then designed in order to reduce weight and maintain the increased strength of the aluminum relative to the polycarbonate. The shell style projectile showed minimal internal deformation and no external plastic de- formation when subjected to the same high pressure as the polycarbonate, suggesting this projectile be used in future experiments where high pressures occur.