Abstract
Shoulder fillets are widely used in the structural optimization design of metal dampers. However, the plastic deformation property of dampers affected by stress concentration, owing to different fillets, has not been explored in-depth. In this study, two typical metal damper materials with different plastic deformation, i.e., ordinary steel SS400 and low-yield-strength steel LYS160, were investigated. The strengthening effect of fillets under different loading is evaluated by comparing the mechanical properties of different fillet heights. Furthermore, the effect of the stress concentration caused by different fillet shapes, based on the failure mode of materials, is discussed. Subsequently, the fatigue degradation effect under the reciprocating shear loading is studied. Based on a series of studies on the deformation properties of fillets in different ductile materials, the basis for the structural optimization design under plastic deformation is provided.
Highlights
As an important energy-dissipating component, metal dampers are widely used in seismic engineering
The failure modes of specimens with different fillet heights under tensile loading are shown in
The deformation properties affected by different shoulder fillets were investigated by tensile and shear loading
Summary
As an important energy-dissipating component, metal dampers are widely used in seismic engineering. Different types of dampers can be designed, using different deformation mechanisms of metal, such as shear [1], tension [2], bending, or their combination [3]. To utilize these dampers more effectively in energy dissipation, the core energy-dissipation structure is typically optimized. The stress concentration of shear panel damper under plastic deformation is quite different with that of traditional shoulder under elastic deformation. Compared with traditional ordinary steel, low-yield-strength steel is becoming more widely used in metal-damper design owing to its large plastic deformation. The mechanical properties of ordinary carbon steel and low-yield-strength steel with different shoulder fillet shapes and heights under different loads were analyzed. The effect of T-shape shoulder fillet on the plastic deformation ability of structures fabricated by using these two different ductile materials is discussed in detail
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