Elastic stresses in an adhesively bonded functionally graded double containment cantilever joint in tension


Apalak Z. G., Ekici R.

JOURNAL OF REINFORCED PLASTICS AND COMPOSITES, cilt.26, sa.13, ss.1291-1318, 2007 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 26 Sayı: 13
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1177/0731684407079370
  • Dergi Adı: JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1291-1318
  • Anahtar Kelimeler: functionally graded material, adhesive, cantilever joint, artificial neural networks, THROUGH-THICKNESS INTEGRATION, FINITE-ELEMENT-METHOD, COMPOSITE-MATERIALS, MICROMECHANICAL MODELS, PLATES, DEFORMATIONS, ADHERENDS
  • Erciyes Üniversitesi Adresli: Evet

Özet

This study investigates the three-dimensional stress state of an adhesively bonded double containment cantilever joint in tension. The plate is composed of a functionally graded region between ceramic (Al2O3) top layer and metal (Ni) bottom layer. The mechanical properties of the graded region were defined based on a power law distribution and modeled with a layered three-dimensional finite element. Stress concentrations occur inside the adhesive fillets along the free edges of the adhesive layer and through the corresponding plate and support regions. The peak adhesive stresses are observed at the free edge of the containment-adhesive interface. The von Mises stress through the graded plate thickness increases uniformly from the metal layer to the ceramic layer. The stress profiles peak around the adhesive free edges. The stress levels change suddenly near the ceramic layer in the metal-rich graded plate whereas the through-the-thickness stress profiles become uniform in the ceramic-rich graded plate. The layer number has a small effect on the through-the-thickness adhesive and plate stress profiles but on the peak stress levels. This effect becomes negligible after a layer number of 20. The compositional gradient exponent considerably affects both the through-the-thickness plate stress profiles and levels. As the material composition is enriched with the ceramic the stress profiles become uniform. The effects of the geometrical parameters and the compositional gradient exponent on the strain energy of the adhesive joint are investigated using the artificial neural networks. Consequently, the plate thickness and the compositional gradient exponent are the most dominant design parameters affecting the strain energy, and the adhesive thickness, the support length, and thickness are others in sequence. The strain energy increases drastically with increasing plate thickness whereas it decreases with increasing support length and thickness and as the material composition of the graded plate enriches with the ceramic. An optimum joint design requires that the plate thickness and the adhesive thickness be minimal, the support length, and thickness be maximal, and the material composition consist of the constituent with higher modulus as possible.