Browsing NTNU Open by Author "Holmen, Jens Kristian"
Now showing items 21-31 of 31
-
Influence of yield-surface shape in simulation of ballistic impact
Holmen, Jens Kristian; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2017)A high-exponent yield criterion is applied in 3D nonlinear finite element simulations of ballistic impact. The computational models are based on a comprehensive experimental study including material tests of 12 mm thick ... -
Low-velocity impact on multi-layered dual-phase steel plates
Holmen, Jens Kristian; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2015)In this paper an experimental program investigating the behavior of monolithic and multi-layered configurations of 0.8 mm and 1.8 mm medium-strength steel plates is presented. We have considered impacts by blunt-ended and ... -
Modeling and Simulation of Ballistic Impact
Holmen, Jens Kristian (Doctoral theses at NTNU;2016:240, Doctoral thesis, 2016)Numerical simulations are increasingly becoming an important tool to obtain efficient designs of protective structures, and the existing literature shows that many phenomena can be accurately described by standard methods ... -
Modeling and Simulation of Hypervelocity Impact Against Debris Shields for Spacecraft Protection
Tjønn, Else (Master thesis, 2017)In this project, IMPETUS Afea Solver was used to simulate hypervelocity impact on Whipple shields. The micrometeoroid and orbital debris environment around the International Space Station was studied in order to understand ... -
Modelling and simulation of hypervelocity impact against debris shields for spacecraft protection
Færgestad, Rannveig Marie (Master thesis, 2021)Abstract will be available on 2024-06-29 -
Perforation of laminated glass: An experimental and numerical study
Osnes, Karoline; Holmen, Jens Kristian; Grue, Tormod Håøy; Børvik, Tore (Peer reviewed; Journal article, 2021)Laminated glass is a type of safety glass that is frequently used in blast-resistant windows and bullet-proof glazing. However, few studies concerning the perforation resistance of laminated glass exist in the open literature. ... -
Perforation of welded aluminum components: Microstructure-based modeling and experimental validation
Holmen, Jens Kristian; Børvik, Tore; Myhr, Ole Runar; Fjær, Hallvard Gustav; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2015)Perforation of welded aluminum structures by small-arms bullets is studied both experimentally and numerically in this paper. From the chemical composition, artificial aging history, and welding procedure, the spatial ... -
Perforation of welded aluminum extrusions: Numerical prediction and experimental validation
Holmen, Jens Kristian; Børvik, Tore; Myhr, Ole Runar; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2015)A purely numerical procedure for predicting the perforation resistance of welded extruded AA6082-T6 aluminum profiles is presented in this study. The numerical work was conducted completely independent of the experimental ... -
Perforation of welded aluminum extrusions: Numerical prediction and experimental validation
Holmen, Jens Kristian; Børvik, Tore; Myhr, Ole Runar; Hopperstad, Odd Sture (Chapter, 2015)A purely numerical procedure for predicting the perforation resistance of welded extruded AA6082-T6 aluminum profiles is presented in this study. The numerical work was conducted completely independent of the experimental ... -
Prediction of ductile failure using a phenomenological model calibrated from micromechanical simulations
Holmen, Jens Kristian; Dæhli, Lars Edvard; Hopperstad, Odd Sture; Børvik, Tore (Journal article, 2016)Unit-cell models were in this study utilized to numerically determine the failure locus of a cast and homogenized AA6060 aluminum alloy. Simulations were conducted for moderate and high stress triaxiality ratios, and for ... -
Strength differential effect in age hardened aluminum alloys
Holmen, Jens Kristian; Frodal, Bjørn Håkon; Hopperstad, Odd Sture; Børvik, Tore (Journal article; Peer reviewed, 2017)The strength differential (SD) effect, as reported in literature over the past decades, is a discrepancy between the axial stresses in compression and tension. This study investigates the SD effect in aluminum alloys using ...