Browsing by Author "Moxnes, John F."

Now showing items 1-20 of 26

    • Analytical cavity expansion penetration models compared with numerical simulations 

      Teland, Jan Arild; Moxnes, John F. (2003)
      Penetration models for rigid projectiles based on cavity expansion theory (CET) are widely used. In this article we performed several hydrocode simulations and compared with analytical results from CET-based theories for ...

    • Cavity expansion theory applied to the penetration of high speed spheres into weak targets 

      Martinussen, Svein Erlend; Moxnes, John F. (2002)
      As a first attempt at identifying a tissue model for use in wound ballistic simulations a study of the deceleration of spherical steel projectiles in soap has been carried out. Experimental data were compared to numerical ...

    • Combustion of RS-41 

      Moxnes, John F.; Nevstad, Gunnar Ove; Eriksen, Svein W. (2000)
      The pyrotechnic composition RS-41, a mixture of 49 wt.% KClO4, 49 wt.% Al/Mg and 2 wt.% Calcium Resinate, is an important ingredient in the MP (Multipurpose) ammunition. RS-41 placed in the front of the projectile ignites ...

    • Comparison between analytical shock mechanic solutions and numerical solutions from the autodyn hydro code 

      Moxnes, John F.; Lilleberg, Bjørn (2004)
      Numerival codes, i.e. Autodyn are widely used for simulations purpose during impact and penetration of prosjectiles into targets. To check the validity of the simulations during shock compression we first study the axiomatic ...

    • Contact surface area of a pyrotechnical granular material 

      Moxnes, John F.; Eriksen, Svein W. (2002)
      The pyrotechnic composition RS-41, a mixture of 49wt% KCLO4, 49wt% Al/Mg and 2wt% Calcium Resinat, is an important ingredient in the Multipurpose (MP) ammunition. RS-41 is placed in front of the projectile and ignites due ...

    • Contact surface area of RS-41 

      Moxnes, John F.; Rysjedal, Jan H. (2000)
      The pyrotechnic composition RS-41, a mixture of 49wt% KCLO4, 49wt% Al/Mg and 2wt% Calcium Resinat, is an important ingredient in the Multipurpose (MP) ammunition. RS-41 is placed in front of the projectile and ignites due ...

    • Development of material models for semi-brittle materials like tungsten carbide 

      Moxnes, John F.; Teland, Jan Arild; Skriudalen, Stian; Bergsrud, Svein Morten; Sundem-Eriksen, Lasse; Fykse, Haakon (2010)
      Tungsten carbide is a very special material that exhibits both brittle and ductile properties. While purely brittle and ductile materials in general are well understood, a theory for describing the properties of a hybrid ...

    • 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 ...

    • Gap test experiments used to study the sensivity of granular explosives 

      Eriksen, Svein W.; Moxnes, John F.; Strømgård, Monica (2004)
      Explosives are widely used in medium to large calibre projectiles to increase the damage on a target. The ammunition produced by Nammo Raufoss, has superb qualities concerning penetration and fragmentation in a target. ...

    • 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 ...

    • Inverse modeling of penetration into 12.7 cartridges 

      Moxnes, John F.; Nilssen, Jan R. (2002)
      In this article a study of the forces caused by penetration of steel penetrators into cartridges of brass has been carried out. Experimental data was compared with simulations using the Nike-2D code and with solutions ...

    • Material properties of Wolfram Carbide established by using a bending test 

      Nilssen, Jan R.; Moxnes, John F.; Sagsveen, Bendik (2002)
      In this article a study of the stresses caused by bending of penetrators made of Wolfram Carbide has been carried out. Experimental data was compared with simulations using the Marc-3D code and with solutions from a simple ...

    • 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 ...

    • A model of internal ballistics properties in gun tubes 

      Moxnes, John F. (2002)
      In this report a study of the pressure generated by burning of gunpowder in gun barrels has been carried out. Calculations using the model were compared with experimental results and with results from the standard ...