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Featured researches published by Frode Grytten.


International Polymer Processing | 2010

Effects of Injection Molding Holding Pressure on the Replication of Surface Microfeatures

Terje Rosquist Tofteberg; Hélène Amédro; Frode Grytten; Erik Andreassen

Abstract The injection molding of an optical grating was studied using two different polycarbonates. The grating had period 10 μm and peak-to-valley distance ∼1 μm. Parts were molded using different holding pressures and mold temperatures. After production, the parts were annealed at 100°C. The replication was investigated using white light interferometry (WLI) before and after annealing. WLI was performed using high definition vertical-scanning interferometry (HDVSI) to resolve the details of the molded gratings with a noise level below 2 nm. It was observed that increasing the holding pressure could have either a positive or a negative effect on the replication. When the microfeatures were not fully filled, an increased holding pressure improved the definition of the features. However, for both polymers, it was observed that the replication as a function of holding pressure started to drop when the holding pressure was increased above an optimal value. This could be due to an elastic recoil occurring after releasing the holding pressure. The peak-to-valley distance of the grating was reduced after annealing. This effect was larger for parts molded using a low mold temperature. This is probably due to a higher cooling rate giving higher internal stresses, which will relax during annealing.


Polymer Testing | 2009

Use of digital image correlation to measure large-strain tensile properties of ductile thermoplastics

Frode Grytten; H. Daiyan; M. Polanco-Loria; S. Dumoulin


International Journal of Impact Engineering | 2009

Low velocity perforation of AA5083-H116 aluminium plates

Frode Grytten; Tore Børvik; Odd Sture Hopperstad; Magnus Langseth


International Journal of Plasticity | 2008

Evaluation of identification methods for YLD2004-18p

Frode Grytten; Bjørn Holmedal; Odd Sture Hopperstad; Tore Børvik


Experimental Mechanics | 2012

Shear Testing of Polypropylene Materials Analysed by Digital Image Correlation and Numerical Simulations

H. Daiyan; Erik Andreassen; Frode Grytten; H. Osnes; R. H. Gaarder


Polymer Testing | 2010

Low-velocity impact response of injection-moulded polypropylene plates - Part 1: Effects of plate thickness, impact velocity and temperature

H. Daiyan; E. Andreassen; Frode Grytten; O.V. Lyngstad; T. Luksepp; H. Osnes


International Journal of Solids and Structures | 2007

Out-of-plane deformation measurements of an aluminium plate during quasi-static perforation using structured light and close-range photogrammetry

Frode Grytten; Egil Fagerholt; Trond Auestad; Bernt Førre; Tore Børvik


Polymer Testing | 2010

Low-velocity impact response of injection-moulded polypropylene plates – Part 2: Effects of moulding conditions, striker geometry, clamping, surface texture, weld line and paint

H. Daiyan; E. Andreassen; Frode Grytten; O.V. Lyngstad; T. Luksepp; H. Osnes


International Journal of Impact Engineering | 2009

Quasi-static perforation of thin aluminium plates

Frode Grytten; Tore Børvik; Odd Sture Hopperstad; Magnus Langseth


Composites Part B-engineering | 2015

Numerical/experimental impact events on filament wound composite pressure vessel

Giovanni Perillo; Frode Grytten; Steinar Sørbø; Virgile Delhaye

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Odd Sture Hopperstad

Norwegian University of Science and Technology

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Tore Børvik

Norwegian University of Science and Technology

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Magnus Langseth

Norwegian University of Science and Technology

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A.H. Clausen

Norwegian University of Science and Technology

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Egil Fagerholt

Norwegian University of Science and Technology

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