Now showing items 21-40 of 41

    • A new standard for predicting lung injury inflicted by Friedlander blast waves 

      van der Voort, M.M.; Holm, Knut B.; Kummer, P.O.; Teland, Jan Arild; van Doormal, J.C.A.M.; Dijkers, H.P.A. (2016)
      An important blast injury mechanism is the rupture of the lungs and the gastrointestinal tract. In explosives safety studies and threat analysis the empirical model of Bowen is often used to quantify this mechanism. The ...
    • Numerical simulation of light armour piercing ammunition against ceramics 

      Teland, Jan Arild (2005)
      Using the hydrocode Autodyn we perform numerical simulations of penetration into various combinations of ceramic armour and backing material. In particular we look at the penetration performance of two common 7.62 x 51 ...
    • Numerical simulation of light armour piercing ammunition against steel 

      Teland, Jan Arild (2005)
      Numerical simulations using the hydrocode Autodyn of two different armour piercing projectiles are performed against steel and ceramic targets. The results are compared with some experimental data available. A major problem ...
    • On the study of ricochet and penetration in sand, water and gelatin by spheres, 7.62 mm APM2, and 25?mm projectiles 

      Moxnes, John Fredrik; Frøyland, Øyvind; Skriudalen, Stian; Prytz, Anne K.; Teland, Jan Arild; Friis, Eva; Ødegårdstuen, Gard (2016)
      We examine the ricochet and penetration behavior in sand, water and gelatin by steel spheres, 7.62 mm APM2 and 25 mm projectiles. A threshold impact angle (critical angle) exists beyond which ricochet cannot occur. The ...
    • Penetration into concrete - analysis of small scale experiments with 12 mm projectiles 

      Sjøl, Henrik; Teland, Jan Arild; Kaldheim, Øyvind (2002)
      The analytical approach for predicting penetration of rigid projectiles into concrete targets indicates that the scaled penetration depth is a function of only two non-dimensional parameters. This report analyses experiments ...
    • Penetration into concrete by truncated projectiles 

      Teland, Jan Arild; Sjøl, Henrik (2000)
      In this report we examine the penetration into semi–infinite concrete targets by truncated projectiles. Forrestal’s semi–analytical penetration formula for ogive–nosed projectiles has earlier been seen to give good ...
    • Penetration into modular targets 

      Olsen, Åge Andreas Falnes; Sjøl, Henrik; Teland, Jan Arild (2002)
      Penetration into modular targets (i.e. a wall or similar structure consisting of several target blocks) is examined using a variety of methods. Full Autodyn-3D simulations are performed and supported by analytical calculations. ...
    • Penetration into rock-rubble overlays 

      Teland, Jan Arild (2024-01-15)
      Rock-rubble overlays can be used for protection against projectiles. Due to the asymmetric and stochastic properties of a rock-rubble overlay, incoming projectiles can be deflected or may even ricochet. In this report we ...
    • Perforation of concrete targets 

      Sjøl, Henrik; Teland, Jan Arild (2003)
      During construction of concrete buildings for military purposes, one is interested in minimizing the potensial damage caused by an impacting projectile. To achieve this, it is necessary to use a wall thickness that either ...
    • Plasticity computation in hydrocodes compared with analytical theory 

      Teland, Jan Arild; Moxnes, John F. (2000)
      Associated analytical plasticity theory is reviewed and compared with the approach to plasticity used in hydrocodes such as Autodyn and Dyna. In general, the two methods are seen to be quite different, but for certain special ...
    • Prediction of concrete penetration using Forrestals formula 

      Teland, Jan Arild; Sjøl, Henrik (2000)
      The various existing empirical formulas for predicting penetration into concrete targets are seen to give different results. Explaining the difference is difficult since most of the original empirical data behind the ...
    • Rapid Autodyn-3D penetration simulations using a virtual target 

      Olsen, Åge Andreas Falnes; Teland, Jan Arild (2002)
      By taking advantage of the possibilities for developing user subroutines in Autodyn-3D, we implement a method that uses a virtual target to decrease runtimes for 3D problems by several orders of magnitude. The new method ...
    • Review of blast injury prediction models 

      Teland, Jan Arild (2012-03-14)
      Methods for predicting human injury from shock waves are studied in detail. The theoretical foundation of the Bowen and Bass lethality curves is examined and the basic hypotheses of the models are studied numerically. ...
    • A review of empirical equations for missile impact effects on concrete 

      Teland, Jan Arild (1998)
      The literature on empirical equations for predicting penetration, perforation and scabbing is examined, and the relevant equations are given. These formulas are written in a nondimensional form in order to simplify comparison. ...
    • Shock attenuation by porous materials 

      Teland, Jan Arild (2015-03-24)
      Shock waves from explosions can do great damage to humans, buildings and other structures. Protective measures may therefore be useful to attenuate the effect of the shock waves. Porous materials have traditionally been ...
    • Shock attenuation experiments using a Hopkinson bar method : summary of experimental results 

      Teland, Jan Arild; Skriudalen, Stian (2009)
      Close-in attenuation of the pressure wave from a detonation is desirable in several applications. Porous materials are often assumed to have good shock damping properties. In this report an experimental set-up using a ...
    • Simple methods of estimating the hazardous area for a multiple blast situation 

      Skriudalen, Stian; Teland, Jan Arild; Skjold, Arild (2012-08-24)
      Active Protection Systems (APS) may cause injury to personnel nearby. To estimate the potential injury from an APS we examine the general case of two charges detonating in relative proximity. Three different methods for ...
    • Single point methods for determining blast wave injury 

      Teland, Jan Arild; Doormaal, Ans van; Horst, Marike van der; Svinsås, Eirik (2011-01-12)
      Models for calculating human injury from a blast wave are examined. The Axelsson BTD model is able to give injury estimates also for complex shock waves, but is difficult to use in practise since it requires input from ...
    • Sluttrapport for prosjekt 766 - Penetrasjon i betong og fjell 

      Svinsås, Eirik; Teland, Jan Arild (2003)
      The activities within Project 766 – Penetration into concrete and rock are described. The main aim has been to establish "state-of-the-art" methods for predicting the effect of precision guided missiles against hardened ...
    • Støy fra skytefelt 

      Huseby, Morten; Rahimi, Reza; Teland, Jan Arild; Dyrdal Idar (2005)
      Norwegian Defence Estates Agency wants to evaluate noise pollution from army firing ranges. At times there can be some noise heard at neighbors near the firing ranges. Norwegian Defence Estates Agency want to extend their ...