Crack propagation resistance along strength mismatched bimetallic interface

Bimetallic three-point-bending specimens and four-point-bending fatigue test specimens were produced from strength mismatched stainless steel/low carbon steel bi-material. Both the J resistance curves and fatigue crack growth behavior were investigated for the bi- and bulk materials. The results showed that a crack initiated easily at the interface, and crack growth resistance along interface was inferior to that of the corresponding bulk materials under either static or dynamic loading conditions.