Odd Sture Hopperstad
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View article: A variational phase-field model for ductile fracture depending on hydrostatic stresses
A variational phase-field model for ductile fracture depending on hydrostatic stresses Open
View article: Tensile ductility of an aluminium alloy: Experiments and simulations with a porous plasticity model
Tensile ductility of an aluminium alloy: Experiments and simulations with a porous plasticity model Open
View article: Finite element modeling of porous ductile solids with non-uniform void size distributions
Finite element modeling of porous ductile solids with non-uniform void size distributions Open
View article: Hypervelocity impact on Whipple shields with varying bumper material at 3 and 7 km/s: An experimental study
Hypervelocity impact on Whipple shields with varying bumper material at 3 and 7 km/s: An experimental study Open
View article: Study of lattice structure anisotropy by crystal elasticity and plasticity FE simulations
Study of lattice structure anisotropy by crystal elasticity and plasticity FE simulations Open
View article: Hypervelocity Impact on Whipple Shields with Varying Bumper Material at 3 and 7 Km/S: An Experimental Study
Hypervelocity Impact on Whipple Shields with Varying Bumper Material at 3 and 7 Km/S: An Experimental Study Open
View article: Open-source implementations and comparison of explicit and implicit crystal-plasticity finite element methods
Open-source implementations and comparison of explicit and implicit crystal-plasticity finite element methods Open
View article: Ductile failure by strain localisation: A computational study of materials and structures subjected to highly non-proportional load histories
Ductile failure by strain localisation: A computational study of materials and structures subjected to highly non-proportional load histories Open
View article: Numerical study on the effects of alloying variations on the crushing behaviour of an aluminium profile
Numerical study on the effects of alloying variations on the crushing behaviour of an aluminium profile Open
View article: Hypervelocity impact against aluminium Whipple shields in the shatter regime with systematic parameter variation: An experimental and numerical study
Hypervelocity impact against aluminium Whipple shields in the shatter regime with systematic parameter variation: An experimental and numerical study Open
View article: Hypervelocity Impact on Whipple Shields with Varying Bumper Material at 7 KM/S: An Experimental Study
Hypervelocity Impact on Whipple Shields with Varying Bumper Material at 7 KM/S: An Experimental Study Open
Introduction Whipple shields, first introduced in 1947 [1] to protect against meteoroids, have been widely used for protection of spacecraft against micrometeoroids and orbital debris. An impacting projectile first hits a thin sacrificial …
View article: Modelling of welded aluminium connections in large-scale analyses
Modelling of welded aluminium connections in large-scale analyses Open
This article addresses large-scale analyses of welded aluminium connections where the weak zones are to be represented by a few shell elements. A combined experimental and numerical study on the behaviour and modelling of welded aluminium …
View article: Modeling brittle crack propagation for varying critical load levels: a dynamic phase-field approach
Modeling brittle crack propagation for varying critical load levels: a dynamic phase-field approach Open
Brittle materials are known for their violent and unpredictable cracking behavior. A behavior which is dictated by a combination of microscopical material defects and the competition between the potential energy of the system and the surfa…
View article: Crystal Elasticity and Plasticity of Lattice Structures: An Open-Source Tool for Generating Polycrystal Fe Models in Abaqus
Crystal Elasticity and Plasticity of Lattice Structures: An Open-Source Tool for Generating Polycrystal Fe Models in Abaqus Open
View article: Hypervelocity Impact Against Aluminium Whipple Shields in the Shatter Regime with Systematic Parameter Variation: An Experimental and Numerical Study
Hypervelocity Impact Against Aluminium Whipple Shields in the Shatter Regime with Systematic Parameter Variation: An Experimental and Numerical Study Open
View article: Effect of load level on cracking of L-shaped soda-lime glass specimens
Effect of load level on cracking of L-shaped soda-lime glass specimens Open
Soda-lime glass is a brittle and transparent material that is known for its rapid and sudden fracture behavior. Since the use of soda-lime glass in protective structures is increasing, a more comprehensive understanding of this challenging…
View article: A physically based strength prediction model for glass
A physically based strength prediction model for glass Open
The strength of glass has been a subject of great interest for more than one hundred years. Due to the stochastic nature of glass, governed by microscopical surface flaws, glass plates exhibit large variations in fracture strength. The aim…
View article: Mechanical behaviour and constitutive modelling of an additively manufactured stereolithography polymer
Mechanical behaviour and constitutive modelling of an additively manufactured stereolithography polymer Open
Additive manufacturing enables the production of complex structures not possible with traditional methods. Such structures are attractive for use in various engineering applications. It follows that knowledge about the mechanical response …
View article: On the spatio-temporal characteristics of the Portevin-Le Chatelier effect in aluminium alloy AA5182: An experimental and numerical study
On the spatio-temporal characteristics of the Portevin-Le Chatelier effect in aluminium alloy AA5182: An experimental and numerical study Open
The Portevin–Le Chatelier (PLC) effect and its spatio-temporal characteristics in the aluminium alloy AA5182 are studied experimentally and numerically in the current work. An extremely high-frequency camera (up to 1000Hz) is utilized to c…
View article: Capturing fracture initiation and crack propagation of car windshields
Capturing fracture initiation and crack propagation of car windshields Open
To facilitate the development of accurate material models for glass, there is a need for reliable experimental procedures that capture the stochastic nature of the material. The experimental setup must be easy to model numerically and outp…
View article: Modelling of ductile failure in materials with heterogeneous particle structure using localization analysis
Modelling of ductile failure in materials with heterogeneous particle structure using localization analysis Open
In this study, we evaluate the use of strain localization analysis based on the imperfection band approach to model the effect of heterogeneous particle distribution on the ductile failure of structural metallic materials. To this end, ten…
View article: A gradient-based non-local GTN model: Explicit finite element simulation of ductile damage and fracture
A gradient-based non-local GTN model: Explicit finite element simulation of ductile damage and fracture Open
Non-local models have over the years been established as an effective approach to solve the pathological mesh dependency problem observed in finite element simulation of strain-softening materials. This paper presents the formulation, impl…
View article: A numerical study on the effect of porosity distribution on ductile failure using size-dependent finite element-based representative volume elements
A numerical study on the effect of porosity distribution on ductile failure using size-dependent finite element-based representative volume elements Open
In this work, we use the size-dependent Monchiet-Bonnet porous plasticity model to study the influence of void size distribution on ductile fracture. The size effect implies that the void growth depends on the material intrinsic length sca…
View article: Ductile tearing of aluminium plates: experiments and modelling
Ductile tearing of aluminium plates: experiments and modelling Open
This paper presents an experimental and numerical study on quasi-static ductile tearing of thin plates of the aluminium alloy AA6016 in three tempers. Depending on the temper, the main fracture mechanism in the plate tearing tests changes …
View article: Micromechanics-based simulation of quasi-static and dynamic crushing of double-chamber 6000-series aluminium profiles
Micromechanics-based simulation of quasi-static and dynamic crushing of double-chamber 6000-series aluminium profiles Open
Numerical simulation is becoming an increasingly important tool in the development of crash components in the automotive industry. With accurate numerical predictions of deformation and fracture, developers may be able to optimize and util…
View article: An experimental–numerical study on the evolution of the Taylor–Quinney coefficient with plastic deformation in metals
An experimental–numerical study on the evolution of the Taylor–Quinney coefficient with plastic deformation in metals Open
When plastic deformation of metals occurs by dislocation motion, a part of the plastic work is stored in the material while the remainder is dissipated as heat. The fraction of the plastic work dissipated as heat can be observed on a macro…
View article: On the influence of stress state on ductile fracture of two 6000-series aluminium alloys with different particle content
On the influence of stress state on ductile fracture of two 6000-series aluminium alloys with different particle content Open
Tension-torsion tests were conducted on two 6000-series aluminium alloys with different area fraction of constituent particles. The two alloys, denoted alloy A and B, have previously been characterized and found to have similar matrix mate…
View article: Influence of constituent particles on fracture of aluminum alloys under high-triaxiality loading
Influence of constituent particles on fracture of aluminum alloys under high-triaxiality loading Open
Single-edge notch bending tests are conducted to study the influence of constituent particles on the fracture resistance of aluminum alloys 6061, 6063, and 6110 under high-constraint loading conditions. The alloys are tested in the as-cast…
View article: A numerical study on the effects of DP steel microstructure on the yield locus and the stress–strain response under strain path change
A numerical study on the effects of DP steel microstructure on the yield locus and the stress–strain response under strain path change Open
The mechanical response of dual phase (DP) steel exhibits a complex dependence on the microstructure. The chemical composition and microstructure characteristics of the phases have significant effects on the contrast between the response o…
View article: Influence of Local Microstructural Variations on the Bendability of Aluminum Extrusions: Experiments and Crystal Plasticity Analyses
Influence of Local Microstructural Variations on the Bendability of Aluminum Extrusions: Experiments and Crystal Plasticity Analyses Open
The bendability of extruded profiles of an age hardenable aluminum alloy is investigated using mechanical tests on flat tensile specimens and bending specimens. Two profile geometries are considered, where the profiles exhibit different gr…