Experimental Study on Brittle Fracture with Plastic Strain at Cruciform Butt Joints (Report I) : Effect of Properties of Weld Metal(Mechanics, Strength & Structure Design)

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In The Great Hanshin-Awaji Earthquake Disaster, "the general yield brittle fractures" were observed in beam-column connections of steel building frames. It is considered that the mechanical properties of weld metal have a substantial effect on the fracture. In this paper we describe bi-axial loading test results using cruciform butt specimens welded by three types of welding consumable. The specimens are modeled on a cruciform joint by taking out the part of the beam-flange to column-flange connection. The purpose of this paper is to examine the effect of the mechanical properties of weld metal on fractures. The main results are summarized as follows. 1) In the case of the ductile weld metal, it presented a brittle fracture-surface at -40℃ but the elongation is equal to or greater than that at room temperature that presented a ductile fracture-surface. But in the case of the ductile weld metal, the elongation fell to less than 1/2 mainly because the brittle fracture occurred after the plastic deformation. 2) The fracture-surface appearance only depends on the specimen temperature and not on the mechanical properties of the weld metal (The mechanical properties mean the absolute values of the elongation in the tensile test and Charpy absorbed energy in this paper). The elongation value in the bi-axial tests tends to become large and the fracture-surface also tends to appear ductile with specimen temperature rising. 3) It follows that the specimen that has the larger Charpy absorbed energy has the larger elongation in the bi-axial test, event if the elongation values by tensile tests are equal.
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Experimental Study on Brittle Fracture with Plastic Strain at Cruciform Butt Joints (Report I) : Effect of Properties of Weld Metal(Mechanics, Strength & Structure Design)

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