Three dimensional analysis of periodic cracking in FGM coatings under thermal stresses
9th International Conference on Multiscale and Functionally Graded Materials, Hawaii, Amerika Birleşik Devletleri, 15 - 18 Ekim 2006, cilt.973, ss.676-677, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 973
- Basıldığı Şehir: Hawaii
- Basıldığı Ülke: Amerika Birleşik Devletleri
- Sayfa Sayıları: ss.676-677
- Anahtar Kelimeler: FGM coatings, periodic cracks, semi-elliptical surface crack, stress intensity factor, INTENSITY FACTORS
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
A three dimensional finite element method is used to examine periodic surface cracking problem in a functionally graded coating subjected to transient thermal loads. The ceramic/metal FGM coating is assumed to contain periodic semi-elliptical cracks and to be perfectly bonded to a homogeneous substrate. The composite structure is subjected to transient residual/thermal stresses. Temperature and displacement fields are computed using a three dimensional finite element approach. Finite element models are created by considering a unit cell in the periodic structure. Mode I stress intensity factors are evaluated by means of the displacement correlation technique (DCT). Presented results illustrate the influence of crack periodicity on the transient behavior of the stress intensity factors.