Strength Development in Overmolded Structures

Thijs Donderwinkel*, Martin van Drongelen, Sebastiaan Wijskamp

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Overmolding of thermoplastic composites is a technology in which a thermoplastic composite is thermoformed and subsequently injection overmolded. Although the feasibility of the process is increasingly demonstrated, it is acknowledged that there is a lack of proper design tools that can be used for a right-the-first-time design strategy. Here, a modelling strategy is proposed for the prediction of the bond strength between a composite insert and an injected polymer. The development of the interface strength is affected by the process history as well, where the temperature and polymer chain mobility play an important role. In the model, the melting behavior of the polymer interface is described using the temperature evolution on the interface combined with experimentally determined polymer melting kinetics via flash differential scanning calorimetry (DSC). Dedicated test geometries were developed and manufactured to evaluate the bond strength under different loading conditions. Short beam strength experiments were used to study the flow length dependency of the interface strength and were correlated with the predicted melting evolution on the interface. The outcome was critically reviewed leading to preliminary guidelines for design, materials and processing as well as routes to further mature this technology.
Original languageEnglish
Title of host publicationAdvances in Polymer Processing 2020
Subtitle of host publicationProceedings of the International Symposium on Plastics Technology
EditorsChristian Hopmann, Rainer Dahlmann
ISBN (Electronic)978-3-662-60809-8
ISBN (Print)978-3-662-60808-1
Publication statusPublished - 10 Mar 2020
Event2nd International Symposium on Plastics Technology 2020 - Aachen, Germany
Duration: 5 Sept 20206 Sept 2020


Conference2nd International Symposium on Plastics Technology 2020


  • Overmolding
  • Interface strength
  • Degree of melting
  • 22/2 OA procedure


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