Influence of the bi-material interface on the crack propagation through a thin protective layer

Finite element parametric analysis is performed on a cracked bi-material bar subjected to pure bending in order investigate the fatigue behaviour of short crack thin protective layer laser-cladded steel substrate. Elastic properties surface are chosen with regard real combinations materials when bronze, nickel or cobalt alloys applied as layers improve basic substrate and influence their mismatch analysed. Classical linear elastic fracture mechanics theory applied, several conclusions stated that shall help select suitable material layer. The can be analogically any other combination.