Now showing items 1-12 of 12

    • Experimental study of the fragmentation of hard cores of wolfram carbide during penetration in armour steel plates 

      Moxnes, John F.; Frøyland, Øyvind (2004)
      Numerical codes,e.g. Autodyn are widely used for simulation purposes during impact and penetration of projectiles into targets. To validate the computer simulations, an experimental study of fracturing of sintered wolfram ...
    • Friction studies related to wear of gun barrels 

      Moxnes, John F.; Frøyland, Øyvind (2005)
      In this article a study of the wear of the 12.7 mm gun barrel is performed. Two new measuring methods have been developed to study the wear rates. Electron probe microscopy was also used. Theoretical and experimental ...
    • The GREAC cell used to establish constitutive models for powder type materials 

      Moxnes, John F.; Frøyland, Øyvind (2009)
      In this report a theoretical and experimental study of a glass powder (diameter of 40-80 μm) is made to establish a constitutive material model by using the GREAC (Gauged REActive Confinement) cell. The GREAC cell is simply ...
    • Gun barrel wear studies based on physical kinetics 

      Frøyland, Øyvind; Moxnes, John F. (2006)
      In this article a study of the gun barrel wear mechanisms has been carried out. We construct a mathematical model based on the theory of ordinary differential equations. The model includes heat transfer and particle ...
    • Hardness tests used to establish constitutive models 

      Moxnes, John F.; Frøyland, Øyvind (2008)
      In this report a study of the hardness of different materials are performed theoretically and experimentally. The objective was to study whether the hardness test could be used to establish constitutive material models. We ...
    • Material properties of wolfram carbide established by using a simple indentation test 

      Moxnes, John F.; Nilssen, Jan R.; Frøyland, Øyvind; Friis, Eva (2003)
      In this article a study of the fracture stress caused by indentation of wolfram carbide penetrators into steel blocks has been carried out. Experimental data was compared with simulations using the Nike-2D code and with ...
    • Mechanical studies of wolfram carbide 

      Frøyland, Øyvind; Moxnes, John F. (2004)
      In this article a study of the mechanical properties of a sintered wolfram carbide-cobalt penetrator has been carried out. Different penetrators are studied in a compression test to establish the Young’s modulus, the bulk ...
    • Microscopic studies of wolfram carbide after fracturing 

      Frøyland, Øyvind; Moxnes, John F. (2004)
      In this report a study of the microscopic properties of a fractured sintered wolfram carbide-cobalt penetrator has been carried out. Scanning electron microscopy (SEM) and light microscopy are used to study the fracture ...
    • A model for the burn velocity of tracers 

      Frøyland, Øyvind; Moxnes, John F. (2006)
      In this report we perform a study of the burn velocity of tracer compositions. Both the burn velocity during flight and in static conditions is studied. In addition we present results for varying densities of the tracer ...
    • Oxidation and carburisation steel in gun barrels 

      Frøyland, Øyvind; Moxnes, John F. (2006)
      In this report a theoretical and experimental study of some basic gun barrel erosion mechanisms have been carried out. The theoretical analysis of the reaction mechanisms leading to erosion is based on the minimalization ...
    • Studies of wear charactistics of three different gunpowder gases 

      Frøyland, Øyvind; Moxnes, John F. (2006)
      In this report a study of the gun barrel wear characteristicsof three different gunpowders are performed. The three different gunpowders are: Bofors NC 1214 NEXPLO (NEXPLO), BOFORS NC 1214 EURENCO (EURENCO) and PB Clermont ...
    • Tensile tests of Wolfram Carbide hard cores 

      Frøyland, Øyvind; Moxnes, John F. (2007)
      In this report an experimental study of the tensile strength of different hard cores of Wolfram Carbide was performed. A bending test was constructed for the study. We show that the tensile strength and strain is smaller ...