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Influence of racetracks on porosity in the RTM process

Titel: Influence of racetracks on porosity in the RTM process
Typ:
  • Bachelorarbeit
  • Masterarbeit
Betreuer:
Status: offen

Hintergrund

In the last decades, composite structures have increased their popularity due to their mechanical properties and lightweight. Among many different production techniques, RTM (Resin Transfer Molding) represents a good combination of technical and environmental advantages. This technique consists in the injection of a resin matrix into a closed mold in which the reinforcement material is placed. With the increase of popularity, also the request of high quality parts became fundamental. Thus, the understanding of production related defects and their prevention represent a topical challenge in the modern industry. Amongst these defects, the most severe is porosity: once the matrix has been cured and hardened voids created during infusion remain trapped between the fibers or tows of the reinforcement.

Problemstellung

The formation of voids during the infusion is one of the most critical issues related to the RTM process. It can happen at two different scale levels (micro and macro, depending on infusion conditions and flow front speed) and can possibly lead to failure of the infused parts. It has been demonstrated that the presence of racetracks during the process influences the final content of voids. Racetracks happen most of the time, therefore, it is important to understand the effect on the quality of the final product. Aim of the project is to try to reproduce this phenomenon under different process conditions and analyze the content of pores. The infused parts will be then analyzed with ultrasounds (C-scan) and values compared to simulation models.

Aufgabe

  • Literature research
  • Testing preparation (VARI, RTM, Ultrasound techniques…)
  • Testing phase: generation of specimens with porosity
  • NDT analysis of the results
  • Discussion and finalization

Anforderung

  • Basic knowledge of composite materials and production techniques in advantage
  • The candidate should be motivated in composite materials
  • The project can be done in German or English