Browsing by Author "Johnsen, Bernt Brønmo"
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Dynamic behaviour of ceramic armour systems
Rahbek, Dennis Bo; Johnsen, Bernt Brønmo (2015-11-10)Protection against high-velocity impact from objects such as projectiles is of major concern for bothmilitary and civilian purposes. Lightweight body armour systems for ballistic protection of personnel can be designed ... -
Effect of composite covering on ballistic fracture damage development in ceramic plates
Rahbek, Dennis Bo; Simons, Jeffrey W.; Johnsen, Bernt Brønmo; Kobayashi, Takao; Shockey, Donald A. (2017)This paper describes the damage development in ceramics with and without composite cover during ballistic impact. This is relevant for ceramic inserts in body armor that are often covered with a composite material. To study ... -
Fragmentation of an armour piercing projectile after impact on composite covered alumina tiles
Rahbek, Dennis Bo; Johnsen, Bernt Brønmo (2019-11-18)In a typical body armour system, a hard armour plate is often used in conjunction with a soft ballistic panel. The main purpose of the armour plate is to erode and fragment an impacting projectile, such as 7.62 mm armour ... -
Improved ballistic limit velocity from filament-wound fibres as composite cover on ceramic tiles
Rahbek, Dennis; Roberson, Gwyn E.; Johnsen, Bernt Brønmo (2023)Hard armour plates are used in body armour for protection against high-velocity threats. The strike face often consists of a single ceramic tile that is covered by a sheet material made of a high-tenacity fibre-composite ... -
Investigation of Theoretical Models for the Elastic Stiffness of Nanoparticle-Modified Polymer Composites
Thorvaldsen, Tom; Johnsen, Bernt Brønmo; Olsen, Torbjørn; Hansen, Finn Knut (2015)Mathematical models are investigated and suggested for the calculation of the elastic stiffness of polymer nanocomposites. Particular emphasis is placed on the effect on the elastic stiffness from agglomerates and the ... -
Karakterisering av epoksypolymerer for anvendelse i fiberarmerte komposittmaterialer
Johnsen, Bernt Brønmo; Rørkjær, Solveig (2011-01-20)I dette arbeidet har tre ulike epoksypolymerer som er relevante med tanke på bruk i fiberarmerte komposittmaterialer, blitt studert. De termiske egenskapene til polymerene har blitt kartlagt, da dette er viktig informasjon ... -
Material properties of silica/epoxy nanocomposites
Johnsen, Bernt Brønmo; Bourgeaux-Goget, Marie; Olsen, Torbjørn (2015-06-29)The use of composite materials in a variety of applications has increased considerably in the last couple of decades. The main reason for this is that composite materials are lightweight materials with high strength and ... -
Non-destructive testing of graphene/epoxy composites using THz waves
Haakestad, Magnus W.; Johnsen, Bernt Brønmo; Dam, Anh Hoang; Mastin, Johann Roland M; Eid, Michel; Rheenen, Arthur Dirk van (2018-10-05)In earlier experiments [1] we found there was significant transmission of THz radiation through carbon-fiber enforced composites, despite that fact that the dc conductivity of the carbon fibers is expected to be good and ... -
Preparation and characterisation of epoxy/alumina polymer nanocomposites
Johnsen, Bernt Brønmo; Frømyr, Tomas Roll; Thorvaldsen, Tom; Olsen, Torbjørn (2013)The effect of adding nanosized alumina fillers of both fibre-like and spherical shapes to an epoxy polymer has been investigated. The alumina was dispersed in the epoxy hardener using two different sonication techniques. ... -
Surface treatment of alumina ceramic for improved adhesion to a glass fibre-reinforced polyester composite
Lausund, Kristian Blindheim; Johnsen, Bernt Brønmo; Rahbek, Dennis Bo; Hansen, Finn Knut (2015)The adhesion between an alumina ceramic and a glass fibre-reinforced polyester matrix composite has been investigated. The effect of various alumina surface treatments, including degreasing, etching, plasma, grit-blasting ...