• A Lode-dependent Gurson model motivated by unit cell analyses 

      Dæhli, Lars Edvard; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2017)
      In this study, the effects of including a dependency on the third deviatoric stress invariant in the void evolution equation of the Gurson model are examined using unit cell calculations and imperfection band analyses. ...
    • Aluminum structures exposed to blast loading 

      Hustad, Tore Andre; Lindland, Andreas Lyngtveit (Master thesis, 2014)
      Design of blast resistance in structures is an important aspect in modern society. Plated structures are used in a lot of constructions that can be especially vulnerable to explosions. This includes e.g. protective, offshore ...
    • A Multi-Scale Approach for Modelling of Fracture in Aluminium Alloys under Impact Loading 

      Valle, Heidi; Frodal, Bjørn Håkon (Master thesis, 2015)
      The main objective of this thesis was to investigate the ballistic properties of an isotropic AlMgSi aluminium alloy both experimentally and numerically. Uncoupled and coupled fracture models were calibrated using ...
    • A nano-scale material model applied in finite element analysis of aluminium plates under impact loading 

      Johnsen, Joakim; Holmen, Jens Kristian; Myhr, Ole Runar; Hopperstad, Odd Sture; Børvik, Tore (Journal article, 2013)
      Finite element simulations of AA6070 aluminium plates struck by ogival-nose projectiles are performed. The aluminium plates are 20 mm thick and heat treated to temper O, T4, T6 and T7. A nano-scale material model, consisting ...
    • An experimental-numerical method to determine the work-hardening of anisotropic ductile materials at large strains 

      Khadyko, Mikhail; Dumoulin, Stephane; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)
      The determination of work-hardening for ductile materials at large strains is difficult to perform in the framework of usual tensile tests because of the geometrical instability and necking in the specimen at relatively ...
    • An experimental study on the deformation and fracture modes of steel projectiles during impact 

      Rakvåg, Knut Gaarder; Børvik, Tore; Westermann, Ida; Hopperstad, Odd Sture (Journal article, 2013)
      Previous investigations of the penetration and perforation of high-strength steel plates struck by hardened steel projectiles have shown that under certain test conditions the projectile may fracture or even fragment upon ...
    • Anisotropic failure modes of high-strength aluminium alloy under various stress states 

      Fourmeau, Marion; Børvik, Tore; Benallal, A; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2013)
      The influence of stress state and plastic anisotropy on the fracture behaviour of a rolled AA7075-T651 aluminium plate under quasi-static loading conditions is studied both experimentally and numerically. Material tests ...
    • A numerical study on the deformation and fracture modes of steel projectiles during Taylor bar impact tests 

      Rakvåg, Kristian Gaarder; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2014)
      A heterogeneous material model based on macro-mechanical observations is proposed for simulation of fracture in steel projectiles during impact. A previous experimental study on the deformation and fracture of steel ...
    • A physically-based constitutive model applied to AA6082 aluminium alloy at large strains, high strain rates and elevated temperatures 

      Vilamosa, Vincent; Clausen, Arild Holm; Børvik, Tore; Holmedal, Bjørn; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2016)
      This paper presents a physically-based constitutive model applied to an AA6082 aluminium alloy subjected to large strains, high strain rates and elevated temperatures. The model accounts for thermo-elasticity, thermo-vis ...
    • A shock tube facility to generate blast loading on structures 

      Aune, Vegard; Fagerholt, Egil; Langseth, Magnus; Børvik, Tore (Journal article; Peer reviewed, 2016)
      This study evaluates the performance of a new shock tube facility used to produce blast loading in controlled laboratory environments. The facility was found to generate a planar shock wave over the tube cross section by ...
    • A study of the influence of precipitate free zones on the strain localization and failure of the aluminium alloy AA7075-T651 

      Fourmeau, Marion; Marioara, Calin Daniel; Børvik, Tore; Benallal, Ahmed; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2015)
      Age-hardened aluminium alloys have various degrees of precipitate-free zones (PFZs) along grain boundaries (GBs). The PFZs are weak zones and their existence promotes combined transgranular and intergranular fracture, thus ...
    • Ballistic impact of layered and case-hardened steel plates 

      Holmen, Jens Kristian; Solberg, Jan Ketil; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2017)
      We investigated the ballistic resistance of hot-rolled structural steel plates with a nominal yield stress of 355 MPa in this study. Ballistic tests were conducted with 7.62mm armor piercing bullets on monolithic and ...
    • Ballistic Penetration and Perforation of Steel Plates 

      Børvik, Tore (Dr. ingeniøravhandling, 0809-103X; 2000:124, Doctoral thesis, 2001)
      Situations involving impact, i.e. the collision between two or more solids, were at one time primarily of concern to the military. Nowadays, as safety is highlighted within most branches of industry, the field of impact ...
    • Ballistic Perforation of Surface Hardened Mild Steel Plates 

      Thorsen, Henrik; Orthe, Erlend (Master thesis, 2014)
      The main objective with this thesis was to investigate experimentally and numerically the effect surface hardening has on the ballistic properties of monolithic and laminated mild steel plates. 300x300 mm^2 plates of ...
    • Behaviour and Modelling of Flexible Structures Subjected to Blast Loading 

      Aune, Vegard (Doctoral theses at NTNU;2017:101, Doctoral thesis, 2017)
      The last two decades have seen a significant increase in the research activity on blast-loaded structures. This is to a large extent related to the increased threat of deliberate use of high explosives against civilian ...
    • Behaviour of Al-Mg-Si alloys at a wide range of temperatures and strain rates 

      Vilamosa, Vincent; Clausen, Arild Holm; Børvik, Tore; Skjervold, SR; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2015)
      The thermo-mechanical behaviour in tension of three as-cast and homogenized Al-Mg-Si alloys, distinguished by their Mg and Si content, was investigated at a wide range of strains (the entire deformation process up to ...
    • Behaviour of plated structures subjected to blast loading 

      Aune, Vegard; Børvik, Tore; Langseth, Magnus (Journal article; Peer reviewed, 2015)
      An experimental investigation using a new shock tube facility to study blast-load effects on thin aluminium plates is presented. The shock tube is designed to expose materials and structures to extreme loading conditions, ...
    • Bending of X65 Offshore Steel Pipes 

      Lofthaug, Kristoffer; Digerud, Erik (Master thesis, 2014)
      This thesis is part of an ongoing research program between SIMLab and Statoil about impact loads on X65 offshore pipelines and it is a continuation of previous work.Offshore pipelines are frequently impacted by accidental ...
    • Blast Loaded Aluminium Plates: Experiments and numerical simulations 

      Melby, Emil Arne; Eide, Hilde Olaug Stakvik (Master thesis, 2013)
      Light and flexible protective constructions in aluminium could be subjected to a blast load. In this thesis the effect of blast loading on aluminium plates of the type 1050A ? H14 was studied through experiments and numerical ...
    • Cylindrical cavity expansion approximations using different constitutive models for the target material 

      Johnsen, Joakim; Holmen, Jens Kristian; Warren, Thomas L.; Børvik, Tore (Journal article; Peer reviewed, 2017)
      In this article, we investigate the results obtained using different constitutive models for the solution of the cylindrical cavity expansion problem under plane strain conditions. The cylindrical cavity expansion solutions ...