Blar i NTNU Open på forfatter "Hopperstad, Odd Sture"
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Empty and foam-filled circular aluminium tubes subjected to axial and oblique quasi-static loading
Børvik, Tore; Hopperstad, Odd Sture; Reyes, Aase Gavina Roberg; Langseth, Magnus; Solomos, G.; Dyngeland, Torbjørn (Journal article; Peer reviewed, 2003)Tests on tubular columns made of the aluminium alloy 6060-T4 under axial and oblique, quasi-static loading have been performed. The columns were fixed at one extremity, while a concentrated force was applied at the other ... -
Energy absorption and failure in aluminium alloys: An experimental and numerical study
Qvale, Kristin (Doctoral theses at NTNU;2022:213, Doctoral thesis, 2022)Aluminium alloys are a preferred group of materials for crash components in the automotive industry, often offering a substantial strength-to-weight ratio and ductility. The R&D process in the automotive industry is ... -
Experimental and numerical study of dilation in mineral filled PVC
Olufsen, Sindre Nordmark (Doctoral theses at NTNU;2020:388, Doctoral thesis, 2020)This thesis addresses the link between applied load and dilation caused by void growth in mineral-filled PVC employing both experimental and numerical techniques. The influence of stress triaxiality and strain rate on the ... -
An experimental and numerical study of the mechanical behaviour of short glass-fibre reinforced thermoplastics
Holmström, Jens Petter Henrik (Doctoral theses at NTNU;2019:79, Doctoral thesis, 2019)This thesis presents an experimental and numerical investigation of injection-moulded short glass-fibre reinforced thermoplastics subjected to monotonic tensile-dominated quasistatic loadings. Two classes of materials are ... -
An experimental and numerical study of the Portevin-Le Chatelier effect in an AlMg alloy
Xu, Jianbin (Doctoral theses at NTNU;2021:238, Doctoral thesis, 2021) -
Experimental and numerical study on the behaviour of PVC and HDPE in biaxial tension
Ognedal, Anne Serine; Clausen, Arild Holm; Polanco-Loria, Mario A.; Benallal, Ahmed; raka, bumedijen; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2012)This paper presents and discusses a set of biaxial tests on two different polymer materials; PVC and HDPE. The biaxial tests are used to evaluate a hyperelastic–viscoplastic constitutive model involving the pressure-dependent ... -
Experimental characterization and modeling of aluminum alloy AA3103 for complex single and double strain-path changes
Qin, Jisheng; Holmedal, Bjørn; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2018)The stress-strain behavior of the aluminum alloy AA3103 subjected to single and double strain-path changes (SPCs) is studied experimentally. The experimental program includes compression-tension, tension-tension, rolling-tension ... -
Experimental Characterization and Modelling of the PLC Effect in an AlMg-Alloy
Xu, Jianbin; Holmedal, Bjørn; Hopperstad, Odd Sture; Marthinsen, Knut (Peer reviewed; Journal article, 2021)In the present work, uniaxial tension tests have been conducted to study the mechanical response of a commercial Al4.5wt%Mg alloy (AA5182). The measurements range from the strain rate of 10-4 to 100 s-1 at room temperature. ... -
Experimental detection of forming limit strains on samples with multiple local necks
Vysochinskiy, Dmitry; Coudert, Térence; Hopperstad, Odd Sture; Lademo, Odd-Geir; Reyes, Aase Gavina Roberg (Journal article; Peer reviewed, 2016)Sheet metal formability is traditionally described by the forming limit curve (FLC). Experimental FLCs are obtained by performing formability tests and determining failure strains. The strains are usually measured either ... -
Experimental detection of the onset of local necking in an aluminium sheet
Vysochinskiy, Dmitry; Coudert, Térence; Hopperstad, Odd Sture; Lademo, Odd-Geir; Reyes, Aase Gavina Roberg (Journal article; Peer reviewed, 2014)Forming limit diagrams (FLDs) are widely used to assess metal sheet formability. Experimental FLDs are obtained by performing formability tests and determining failure strains. The standard method for detection of forming ... -
Experimental detection of the onset of local necking in an aluminium sheet
Vysochinskiy, Dmitry; Coudert, Térence; Hopperstad, Odd Sture; Lademo, Odd-Geir; Reyes, Aase Gavina Roberg (Journal article; Peer reviewed, 2014)Forming limit diagrams (FLDs) are widely used to assess metal sheet formability. Experimental FLDs are obtained by performing formability tests and determining failure strains. The standard method for detection of forming ... -
Experimental investigation and modelling of strain-path changes in metals
Qin, Jisheng (Doctoral theses at NTNU;2017:287, Doctoral thesis, 2017) -
Experimental set-up for determination of the large-strain tensile behaviour of polymers at low temperatures
Johnsen, Joakim; Grytten, Frode; Hopperstad, Odd Sture; Clausen, Arild Holm (Journal article; Peer reviewed, 2016)In this study, we present a method to determine the large-strain tensile behaviour of polymers at low temperatures using a purpose-built temperature chamber made of polycarbonate (PC). This chamber allows for several cameras ... -
An experimental study on pre-stretched double-chamber 6000-series aluminium profiles subjected to quasi-static and dynamic axial crushing
Qvale, Kristin; Hopperstad, Odd Sture; Reiso, Oddvin; Tundal, Ulf; Marioara, Calin Daniel; Børvik, Tore (Peer reviewed; Journal article, 2020)Automotive crash boxes require a material selection with strength and ductility in a balanced combination. In this work, the behaviour of double-chamber AA6063 and AA6082 aluminium profiles subjected to quasi-static and ... -
Experimental study on the formability of AA6016 sheets pre-strained by rolling
Vysochinskiy, Dmitry; Coudert, Térence; Hopperstad, Odd Sture; Lademo, Odd-Geir; Reyes, Aase Gavina Roberg (Journal article; Peer reviewed, 2017)The effects of prestrain by rolling on the formability of AA6016 sheets in the biaxial stretching region are studied in this paper. An experimental program including formability experiments has been carried out for as-received ... -
Experiments and simulations of empty and sand-filled aluminum alloy panels subjected to ballistic impact
Holmen, Jens Kristian; Børvik, Tore; Hopperstad, Odd Sture (Journal article; Peer reviewed, 2017)In this study, we use a discrete particle method in combination with finite element analysis to describe the interaction between structures and granular media during ballistic impact. By applying a discrete particle method ... -
Finite Element Implementation of Fibre-Reinforced Materials Model in Abaqus/Explicit
Vestrum, Ole (Master thesis, 2015)This thesis is concerned with the constitutive modelling of short fibre-reinforced composites in the finite element code Abaqus/Explicit. The model is presented as a generic framework which is based on a two-phase ... -
Finite element implementation of lower-order strain gradient plasticity in Abaqus
Heggelund, Teodor Lunaas (Master thesis, 2015)A finite element method implementation of lower-order strain gradient plasticity is developed. Its validity is checked against known analytical solutions. The implementation gives expected trends when applied to particle ... -
Finite element modelling of steel bridge structures exposed to ship collisions
Ofstad, Kevin Mandt (Master thesis, 2018)The behavior of the Bressan-Williams-Hill fracture criterion (BWH), which is often used in simulating ship collisions, was studied by modeling and studying existing experiments done on the subject. Three experiments are ... -
Finite element simulation of ductile fracture in polycrystalline materials using a regularized porous crystal plasticity model
Khadyko, Mikhail; Frodal, Bjørn Håkon; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2021)In the present study, a hypoelastic–plastic formulation of porous crystal plasticity with a regularized version of Schmid’s law is proposed. The equation describing the effect of the voids on plasticity is modified to allow ...