Abstract
Maraging steel containing 18 per cent nickel offers apparent advantages of high strength, weldability, corrosion resistance and toughness. In view of the suitability of the material for bridge construction, a study of the fatigue crack growth and fracture properties was undertaken. A proposed bridge design contained hinged sections of 4 in. and 2 in. Thickness for female and male jaws, and thin welded girders manufactured from plate material 0.18 in thick. Plane strain fracture toughness tests were carried out on samples taken from the 4 in. And 2 in. Sections using 3 point-bend and compact tension specimens. K Q values of approximately 75 ksi √in. For the 4 in. samples and 110 ksi √in. For the 2 in. Samples were obtained. Plane stress fracture toughness tests were conducted on center cracked sheets up to 11 in. in width. Using critical crack lengths determined by compliance measurements, K C values in excess of 400 ksi √in. have been obtained in specimens of up to 0.180 in. Thickness. Fatigue crack growth rates were determined from these specimens prior to fracture testing. In both plane strain and plane stress failure modes, laboratory results are in agreement with those estimated from the failure of experimental structures.
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