Frode Grytten
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Featured researches published by Frode Grytten.
International Polymer Processing | 2010
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
Frode Grytten; H. Daiyan; M. Polanco-Loria; S. Dumoulin
International Journal of Impact Engineering | 2009
Frode Grytten; Tore Børvik; Odd Sture Hopperstad; Magnus Langseth
International Journal of Plasticity | 2008
Frode Grytten; Bjørn Holmedal; Odd Sture Hopperstad; Tore Børvik
Experimental Mechanics | 2012
H. Daiyan; Erik Andreassen; Frode Grytten; H. Osnes; R. H. Gaarder
Polymer Testing | 2010
H. Daiyan; E. Andreassen; Frode Grytten; O.V. Lyngstad; T. Luksepp; H. Osnes
International Journal of Solids and Structures | 2007
Frode Grytten; Egil Fagerholt; Trond Auestad; Bernt Førre; Tore Børvik
Polymer Testing | 2010
H. Daiyan; E. Andreassen; Frode Grytten; O.V. Lyngstad; T. Luksepp; H. Osnes
International Journal of Impact Engineering | 2009
Frode Grytten; Tore Børvik; Odd Sture Hopperstad; Magnus Langseth
Composites Part B-engineering | 2015
Giovanni Perillo; Frode Grytten; Steinar Sørbø; Virgile Delhaye