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Fatigue Fracture of NBR-coated SUS301 Thin Plate for MLS Gasket  

Han, Byoung-Kee (Department of Mechanical & System Design Engineering, Hongik University)
Cho, Sung-San (Department of Mechanical & System Design Engineering, Hongik University)
Chang, Hoon (Hyundai Motor Company)
Kim, Beom-Keun (Hyundai Motor Company)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.12, no.4, 2004 , pp. 207-212 More about this Journal
Abstract
Full-beads of multi-layer steel engine head gaskets that are used to seal the combustion gas between the head and the block are subject to cyclic bending stresses due to the variation of the head/block gap during engine operation. The S-N curve for the fatigue durability assessment of the full-bead formed on NBR-coated SUS301 thin plate is deduced from the axial fatigue test results because of the difficulty in conducting the bending fatigue test of thin plate. The experimental verification of the deduced S-N curve is presented. It is shown that the NBR coating increases the endurance limit of the plate significantly. Mechanism of crack nucleation and propagation in the full-bead is discussed with photographs of the fatigue cracks.
Keywords
MLS gasket; Fatigue fracture; Stainless steel; Thin sheet; Bead; S-N curve;
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