Remko Akkerman
University of Twente
Composite numberEngineeringFinite element methodForming processesConsolidation (soil)Composite materialPermeability (earth sciences)Materials scienceThermalWoven fabricThermoplasticThermoplastic compositesResidual stressFiberPultrusionMechanicsStructural engineeringDelaminationPeekMechanical engineeringProcess (computing)
375Publications
28H-index
3,082Citations
Publications 369
Newest
#1R.D.R. Sitohang (UT: University of Twente)
#2Wouter Johannes Bernardus Grouve (UT: University of Twente)H-Index: 12
Last. Remko Akkerman (UT: University of Twente)H-Index: 28
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Abstract null null The influence of in-plane fiber waviness defects on the compressive properties of quasi-isotropic (QI) carbon polyether-ether-ketone (C/PEEK) composites was investigated experimentally. Specimens with localized waviness were manufactured using a stamp forming process resulting into laminates featuring multiple wavy plies, i.e. from one to three wavy 0 null null null ° null null null null plies in a 24-ply QI composite and a range of maximum waviness angle between 23 null null ...
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#1Vanessa M. Marinosci (UT: University of Twente)
#2Wouter Johannes Bernardus Grouve (UT: University of Twente)H-Index: 12
Last. Remko Akkerman (UT: University of Twente)H-Index: 28
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A B S T R A C T The aim of this study was to determine the effect of the metal surface roughness on the mechanical performance of titanium- unidirectional C/PEKK composite joints. Various surface morphologies were obtained by grit-blasting the titanium surface using different blasting pressures. Subsequently, test coupons were manufactured by co-consolidating titanium- unidirectional C/PEKK in an autoclave. Topographical characterization of the titanium surface and evaluation of interfacial frac...
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#1R.D.R. Sitohang (UT: University of Twente)
#2Wouter Johannes Bernardus Grouve (UT: University of Twente)H-Index: 12
Last. Remko Akkerman (UT: University of Twente)H-Index: 28
view all 5 authors...
In-plane fiber waviness is one of the defects that can occur from the stamp-forming process of thermoplastic composite (TPC) parts. The influence of this defect on the mechanical performance of mul...
1 CitationsSource
#1Onur YukselH-Index: 4
#2Michael SandbergH-Index: 5
Last. Ismet BaranH-Index: 19
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Pultruded fiber-reinforced polymer composites are susceptible to microstructural nonuniformity such as variability in fiber volume fraction (Vf), which can have a profound effect on process-induced residual stress. Until now, this effect of non-uniform Vf distribution has been hardly addressed in the process models. In the present study, we characterized the Vf distribution and accompanying nonuniformity in a unidirectional fiber-reinforced pultruded profile using optical light microscopy. The i...
1 CitationsSource
#1Amin Zaami (UT: University of Twente)H-Index: 5
#2Ismet Baran (UT: University of Twente)H-Index: 19
Last. Remko Akkerman (UT: University of Twente)H-Index: 28
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Abstract The optical properties of unidirectional (UD) fiber reinforced thermoplastic (FRTP) tapes were characterized to enable a better description of the heating phase in laser-based manufacturing process of FRTP composites. The tapes included PP-GF (glass-fiber) 45% fiber volume content (FVC), PVDF-CF (carbon-fiber) 45% FVC, PVDF-CF 60% FVC and PA12-CF 60% FVC. The transmittance of the tapes was found to be 0.00–0.2% whereas the reflectance was 9.8–11.8% corresponding to a refractive index of...
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#1Ozan CelikH-Index: 2
#2S.M. Amin Hosseini (UT: University of Twente)H-Index: 3
Last. Clemens DransfeldH-Index: 13
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Abstract The effect of thermal contact resistance (TCR) correlated to the degree of intimate contact (DIC) between the incoming tape and the substrate on the temperature history during laser-assisted fiber placement (LAFP) was investigated. A novel experimental methodology was designed to understand the effect with a non-contact method which did not influence the local consolidation quality. To assess the influence of TCR numerically, a three-dimensional optical-thermal model was developed. Expe...
1 CitationsSource
Last. Remko AkkermanH-Index: 28
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Hot press forming is an attractive production technology to fulfil the increasing demand for complex fiber-reinforced thermoplastic parts. Over the years, process simulation tools on press forming have shown to be very helpful in facilitating the design stage for defect free parts production. One of the important deformation mechanisms considered in process simulations is the relative slip of successive plies or ply-ply friction, of which the underlying principles need to be better understood in...
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Last. Remko AkkermanH-Index: 28
view all 4 authors...
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Last. Remko AkkermanH-Index: 28
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Forming simulations are a cost-effective solution to mitigate process-induced defects. The models developed to simulate the forming process require material property data for the dominant deformation mechanisms: intra-ply shear, bending, and inter-ply friction. These mechanisms are considered independent, and material property data has to be derived from experimental data for each mechanism separately. However, it is known that the material response to the deformation mechanisms is correlated, a...
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#1Amin Zaami (UT: University of Twente)H-Index: 5
#2Martin Schäkel (Fraunhofer Society)H-Index: 4
Last. Remko Akkerman (UT: University of Twente)H-Index: 28
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A numerical process simulation framework is introduced in this paper to describe and predict the process temperature evolution during the laser-assisted tape winding (LATW) process of a type-IV pre...
3 CitationsSource