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Featured researches published by A.D. Rietman.


Key Engineering Materials | 2012

Forming of Thermoplastic Composites

Sebastiaan Haanappel; Ulrich Sachs; R.H.W. ten Thije; A.D. Rietman; Remko Akkerman

Design and production guidelines for UD reinforced thermoplastic composites are highly desirable. Therefore, forming experiments and simulations with a realistic complex shaped product were conducted. Thermoforming experiments with quasi-isotropic UD carbon/PEEK and 8HS woven glass/PPS composites showed a clear difference in formability. Many wrinkles develop near doubly curved areas for the considered UD composites, whereas significant in-plane shear is observed for the woven composites. Forming prediction tools can be utilised to optimise the product design with respect to formability. A forming prediction methodology is shown, which encompasses finite element modelling in combination with material models that describe major deformation mechanisms. Characterisation methods were developed to describe inter-ply friction and in-plane shear. Forming simulations are able to indicate the critical areas for the UD composites, as is concluded from the comparison of wrinkling and in-plane shear distributions within the formed specimens. Forming experiments and predictions match qualitatively well and this tool can successfully be utilised in the product design phases.


Key Engineering Materials | 2013

Formability of Fiber-reinforced thermoplastics in hot press forming process based on friction properties

Ulrich Sachs; Sebastiaan Haanappel; A.D. Rietman; ten R.H.W. Thije; Remko Akkerman

High performance composites are used in commercial applications in a steadily growing degree. This increase of advanced materials is accomponied with the development of fully automated fabrication processes. It aims to drive down the time and costs of the production while ensuring a high quality of the product. This can achieved by considering the process of hot press forming with continuous fiber reinforced thermoplastics. The development of the process is, however, accompanied with a few difficulties, which require more research. For example, composite materials with different architectures, lay-ups, and constituents, show large differences in formability. This research examines the effect of friction on the formability of thermoplastic composites. Both experiments and simulations were conducted. Demonstrator products have been press-formed from laminates with different materials and architectures (UD-carbon PEEK, UD-carbon-PEI, 8hs-glass PPS, 5hs-carbon PEEK and UD-glass PPS), to investigate their effects on formability. Creating a doubly curved shape from a flat laminate requires at least three deformation mechanisms, namely in-plane shear, bending and inter-ply slippage This paper focuses on the sliding mechanism and the corresponding friction. In order to quantify the amount of sliding in the press-formed product, a dot pattern has been applied to both surfaces of the laminate. The slip between the outer plies can be analyzed by means of photogrammetry. Besides, the friction coefficient of each material is measured in a special designed friction test set-up. It can be seen that the composite formability is directly linked to its friction properties. FE simulations of the press-form process will be performed based on the measured material properties, to demonstrate the influence of the materials friction coefficient.


Archive | 2012

Failure Modeling of Thermoplastic Butt-Joint Stiffened Panels by Quasi-Static Loading

K. Ilin; Laurent Warnet; A.D. Rietman; Remko Akkerman; R.H.W. ten Thije


Archive | 2012

Towards Design for Thermoplastic Composites Manufacturing Using Process Simulation

Remko Akkerman; A.D. Rietman; Sebastiaan Haanappel; Ulrich Sachs


TexCompu-11 conference | 2013

Influence of moisture content on impact properties of flax fibre reinforced polymers

S.H. Jansma; A.D. Rietman; Laurent Warnet; Remko Akkerman; Stepan Vladimirovitch Lomov


19th International Conference on Composite Materials, ICCM-19, 2013 | 2013

Experimental characterisation of recycled (glass/tpu woven fabric) flake reinforced thermoplastic composites

M.I. Abdul Rasheed; A.D. Rietman; H.A. Visser; Remko Akkerman


19th International Conference on Composite Materials, ICCM-19, 2013 | 2013

Braiding take-up speed optimization - case studies

van J.H. Ravenhorst; A.D. Rietman; Remko Akkerman; S.V. Hoa; P. Hubert


SAMPE Benelux Student Seminar 2013 | 2012

Characterisation of recycled (glass/TPU woven fabric) flake reinforced thermoplastic composite

M.I. Abdul Rasheed; A.D. Rietman; H.A. Visser; Remko Akkerman


11th International Conference on Flow Processes in Composite Materials, FPCM-11 2012 | 2012

Shear Characterisation of UD Thermoplastic Composites

Sebastiaan Haanappel; Ulrich Sachs; ten R.H.W. Thije; A.D. Rietman; Remko Akkerman; Simon Bickerton; Piaras Kelly


Economic and Political Weekly | 2011

In-Plane Shear Characterisation of Uni-Directionally Reinforced Thermoplastic Melts

Sebastiaan Haanappel; R.H.W. ten Thije; Ulrich Sachs; A.D. Rietman; Remko Akkerman; Gary Menary

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