Investigation of thermoforming processes of aerostructures: Simulation and microstructural analysis


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Çobanoğlu M., Ece R. E., Ünlü B., Öz Y., Toros S., ÖZTÜRK F.

International Journal of Advanced Manufacturing Technology, cilt.132, sa.9-10, ss.5039-5052, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 132 Sayı: 9-10
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1007/s00170-024-13629-1
  • Dergi Adı: International Journal of Advanced Manufacturing Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, IBZ Online, Compendex, INSPEC, DIALNET
  • Sayfa Sayıları: ss.5039-5052
  • Anahtar Kelimeler: Aerospace applications, Crystallization, PEKK, Rapid manufacturing, Thermoforming, Thermoplastic
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

A series of experimental and numerical studies were carried out on the mechanical and geometric performance of an aerostructural part produced by a material out-of-autoclave stamp forming process using unidirectional (UD) carbon fiber (CF) reinforced polyetherketoneketone (PEKK), which provides advantages like reshaping, recycling, welding, and low serial manufacturing costs. As a novelty, initial part geometry, different types of springs, and their attachment type were examined experimentally and compared with simulations. Compression tests were performed to determine mechanical strengths which reach levels up to 550 MPa. In addition, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were conducted to determine the crystallinity which occurs depending on the cooling regimes of the material. The crystallinity has been observed to vary regionally ranging from 16 to 21%. However, the crystallinity of the part towards the cold mold region decreased from 20 to 17%. In addition, simulations were performed to observe and control the occurrence of wrinkles and other defects.