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The effect of cross-sectional shapes of polysulfide sealing beads on fatigue resistance to joint movement was studied experimentally and analytically. Five kinds of sealing beads that were different in the depth of their surface concavity were repeatedly extended and contracted by a fatigue machine. During the tests, cracks appeared around the corner or in the middle of the surfaces in some specimens. The time to cracking clearly became shorter on the specimens with deeper concave surfaces. To learn the reason for these results, the stresses along the surfaces of sealing beads were studied further using a boundary element method. It was concluded from the both experimental and analytical results that a durable cross-section of a sealing bead to fatigue is a slightly concave shape.
polysulfide, sealant, cross-sectional shape, fatigue resistance, cyclic test, joint movement, sealing bead
Associate Professor, Research Laboratory of Engineering Materials, Tokyo Institute of Technology, Yokohama,
Professor, Oita University, Ohita,
Professor, Chiba Institute of Technology, Narashino,