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The effect of cross-sectional shapes of polysulfide sealing beads on shear fatigue resistance to sliding joint movement was studied experimentally and analytically. Six kinds of sealing beads that were different in the depth of their concavity were repeatedly deformed by shear joint movement. Cracks appeared in surface near substrates or in the middle of surfaces in some specimens, and developed in parallel to substrates or in X-shape. The time to cracking became shorter for the specimen with deeper concave shape. To learn the reason for these results, the surface stresses of the beads were studied using a finite element method. It was concluded from both experimental and analytical results that a durable cross-section of a sealing bead to shear joint movement is rectangular or slightly concave shapes.
sealant, polysulfide, shear fatigue, shear joint movement, sealing bead, cross-sectional shape, concave surface, cyclic test