Characterization of Interfacial Adhesion Between
Carbon-carbon Composite and Plasma-sprayed
Aluminum Oxide
Chapter: 04- Interfacial Fracture Mechanics
 Principles of Linear Elastic Interfacial Fracture Mechanics:
• F= W-U-Ke where, F= the energy required for crack growth, W= external work done on the system, U= elastic
energy stored in the system, Ke= kinetic energy (if the crack travels at speeds comparable to the speed of
sound in the material; sudden crack burst event; cracking associated with snap buckling. For a steady-state
slow crack propagation, Ke is negligible ≈ 0)
• If body is fixed on boundaries, W=0
𝑑
𝑑
• R=𝑑𝑎(F)==𝑑𝐴(W-U)=G=Gc, When Crack resistance (R)= G, fracture occurs. a= crack length
𝑑
• Also applicable, when the crack doesn’t move. 𝑑𝑎(F) referred as the transferred rate of energy per crack
length.