矩形断面をもつシーリングジョイントの耐疲労性に及ぼす形状・寸法の影響

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タイトル別名
  • FATIGUE RESISTANCE OF A POLYSULFIDE SEALANT INJECTED IN VARIOUS RECTANGULAR CROSS SECTIONS
  • クケイ ダンメン オ モツ シーリング ジョイント ノ タイ ヒロウセイ ニ

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Fatigue resistance of a two-part polysulfide sealant injected in various rectangular cross sections was experimentally investigated. The sealant was injected into 18 kinds of cross sections changing the width and depth. The specimens thus obtained were subjected to repeated extension and contraction upto ±10%, ±30% and ±50% by the deformation rate of joint width. The beads of the sealant with thin cross sections showed buckling shape like an arch when the joints were contracted, while the beads of thick cross sections were bulged like a barrel. The positions where fatigue cracks occurred in the beads were closely related to compressed shapes of them during fatigue operation : Cracks mostly appeared at the middle on the bottom surface when a bead buckled, and at the both ends, near substrates, on the exterior or bottom surfaces when bulged. By the method of photo-elasticity, it was made clear that tensile and compressive stresses occurred repeatedly on the surface of a sealing bead in response to joint movements. Fatigue resistance of sealed joints was not simply related to proportions of depth (D)/width (W) of beads but much affected by depth itself, and their relation could be expressed by log N=-A log (D^n/W)+B.

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