Experimental Study of Brittle Fracture with Plastic Strain at Cruciform Butt Joints (Report II) : Effect of cyclic loading(Mechanics, Strength & Structure Design)

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In The Great Hanshin-Awaji Earthquake Disaster, brittle fractures with plastic strain were observed in beam-column connections of steel building frames. It is considered that the mechanical properties of weld metal, especially the ductility, affected the fractures. In Report I, we described monotonic bi-axial loading test results using cruciform butt specimens welded by three types of welding consumable. We examined the effect of the mechanical properties of weld metal on fractures under monotonic loading. In this Report II, we describe cyclic bi-axial loading test results using cruciform butt specimens that are the same as Report I. The purpose of this paper is to examine the effect of cyclic loading on fractures. The main results are summarized as follows. 1) The fracture-surface appearance mainly depends on the specimen temperature, regardless of the loading pattern. But the brittle fracture-surface ratios tend to decrease in the order the magnitude of Charpy absorbed energies of the weld metal under cyclic loading. 2) Similarly, in the results under monotonic loading, it follows that the specimen that has the larger Charpy absorbed energy also has the larger elongation in the bi-axial test under cyclic loading, even if the elongation values by tensile tests are equal. 3) In the specimen with the ductile weld metal, the load declined gradually under cyclic loading, whereas all specimens fractured immediately under monotonic loading. 4) In the specimens with the brittle weld metal, they fractured suddenly and in a brittle fashion without load-down at -40℃ under cyclic loading and the elongation was much smaller than that in the ductile weld metal. 5) In the specimens with the brittle weld metal, the elongation was smaller than in the ductile weld metal even at room temperature under cyclic loading.
大阪大学の論文

Experimental Study of Brittle Fracture with Plastic Strain at Cruciform Butt Joints (Report II) : Effect of cyclic loading(Mechanics, Strength & Structure Design)

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