Fatigue Crack Propagation Behavior in Laminated Composite Materials Using Pure Copper and Carbon Steel(Composite 1)

概要

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Two types of laminated composite plates reinforcing pure copper with carbon steel were prepared. One was the steel-copper-steel (SCS) hot-rolled clad plates, and the other the copper-steel-copper (CSC) diffusion-bonded plates. As a result of fatigue testing using these specimens, the fatigue crack showed a zigzag crack front with a large roughness on the fracture surface of the inner copper sandwiched between both carbon steels in the SCS type plate with large thickness, while it showed a relatively smooth crack front on the fracture surface of the steel part. An influence of such a fracture surface roughness on the fatigue crack propagation was discussed in terms of fracture mechanics parameter. The fatigue crack propagation rate, da/dN, for all the laminated composite plates and the carbon steel base plates gathered in a small band expressed by the power law of ΔK_<est>/E, using the stress intensity factor range Δ K_<est> evaluated from the measured crack opening displacement and Young's modulus E. If examined in detail, however, the da/dN was lower in the thicker SCS type plate than in the CSC and the base plates, due to the large roughness on the fracture surface of the inner copper part.
一般社団法人日本機械学会の論文
2001-10-20