Richard Birkelands vei

Trondheim, Norway

Richard Birkelands vei

Trondheim, Norway

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Hajilou T.,Richard Birkelands vei | Deng Y.,Richard Birkelands vei | Rogne B.R.,Richard Birkelands vei | Kheradmand N.,Richard Birkelands vei | Barnoush A.,Richard Birkelands vei
Scripta Materialia | Year: 2017

Single crystalline microcantilevers of Fe–3wt% Si were bent while electrochemically hydrogen (H) charged in situ inside a miniaturized electrochemical cell and are compared with cantilevers bent in air. Yield point decreases, crack initiation and propagation were observed for the cantilevers bent in the presence of H, while notch blunting occurred for the cantilevers bent in air. The results show H enhanced dislocation nucleation and H pinning of dislocation at the crack tip are responsible for embrittlement. © 2017 Elsevier Ltd


Elverum C.W.,Richard Birkelands vei | Welo T.,Richard Birkelands vei
Journal of Engineering and Technology Management - JET-M | Year: 2015

Physical prototypes have always been important in engineering design. However, little is known about the role that prototypes play in the development of complex physical products. This paper investigates the role of prototypes and prototyping in the development of two novel product innovations recently launched by an automotive original equipment manufacturer (OEM). Through an exploratory case study, prototypes are found to provide the capability to aid learning and communication both within the development teams and across the organization. Actual prototype usage was found to encompass activities beyond merely the verification and validation purposes covered in traditional engineering design literature. © 2015 The Authors. Published by Elsevier B.V.


Barnoush A.,Richard Birkelands vei | Kheradmand N.,Richard Birkelands vei | Hajilou T.,Richard Birkelands vei
Scripta Materialia | Year: 2015

The variation in the pop-in load during electrochemical nanoindentation of Fe 3 wt.% Si alloy at different cathodic polarizations was measured. It is clearly shown that a higher hydrogen chemical potential results in a lower pop-in load, which is an indication of easier dislocation nucleation below the tip. Classic dislocation theory and defactant model are used to analyze the data and calculate the excess hydrogen on the dislocation line at different electrochemical potentials. © 2015 Acta Materialia Inc.


Kheradmand N.,Richard Birkelands vei | Johnsen R.,Richard Birkelands vei | Olsen J.S.,Richard Birkelandsvei | Olsen J.S.,Aker Solutions | Barnoush A.,Richard Birkelands vei
International Journal of Hydrogen Energy | Year: 2016

Despite its superior corrosion resistance, super duplex stainless steels (SDSS) are prone to hydrogen embrittlement. In this paper, a novel in situ electrochemical nanoindentation technique is used to investigate the hydrogen effect on the nanomechanical response of the existing phases in SDSS, i.e. ferrite and austenite. A systematic change in electrochemical (EC) charging potential revealed the interconnected nature of the hydrogen effect on the nanomechanical properties of SDSS. It is shown that the hydrogen effects in each phase are very different and are strongly coupled with the existing residual stresses in the microstructure induced during the manufacturing and/or induced by EC hydrogen charging. © 2015 Hydrogen Energy Publications, LLC.

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