자동차 유압브레이크용 고무호스의 내구성 시험 및 미세손상에 관한 연구
Durability Test and Micro-Damage Formation of Rubber Hose for Automotive Hydraulic Brake
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초록
Rubber hose assembly for automotive hydraulic brake during operation is subject to combined stresses of cyclic pressure, cyclic bending and torsion as well as thermal load. The rubber hose is composed of ethylene-propylene diene monomer(EPDM) rubber layers reinforced by polyvinyl acetate(PVA) braided fabrics. A durability tester with loading rigs for inducing the above cyclic stresses was used to investigate failure mechanisms in the rubber hose assembly. Failure examination was performed at every 100 thousands cycles of bending and torsion. Hose samples were sectioned with a diamond-wheel cutter and then polished. The polished surface was observed by optical microscope and scanning electron microscope (SEM). Some interfacial delamination with a length of about 1mm along the interface between EPDM rubber and PVA fabrics was shown at the test cycles of 400,000. The delamination induced some cracking into the outer rubber skin layer to leading the final rupture of the hose.
Abstract
Rubber hose assembly for automotive hydraulic brake during operation is subject to combined stresses of cyclic pressure, cyclic bending and torsion as well as thermal load. The rubber hose is composed of ethylene-propylene diene monomer(EPDM) rubber layers reinforced by polyvinyl acetate(PVA) braided fabrics. A durability tester with loading rigs for inducing the above cyclic stresses was used to investigate failure mechanisms in the rubber hose assembly. Failure examination was performed at every 100 thousands cycles of bending and torsion. Hose samples were sectioned with a diamond-wheel cutter and then polished. The polished surface was observed by optical microscope and scanning electron microscope (SEM). Some interfacial delamination with a length of about 1mm along the interface between EPDM rubber and PVA fabrics was shown at the test cycles of 400,000. The delamination induced some cracking into the outer rubber skin layer to leading the final rupture of the hose.
참고문헌 (5)
- Motion Analysis of Brake Hose According to Vehicle Steering, "S. G. Jeon", 947~952, pp.KSAE 06-S0151 (2006)
- "Hose assemblies for automotive hydraulic brake reliability standards RS R 0043, Korean Agency for Technology and Standards", ~ (2004)
- K. J. Lee, "Studies on the Mechanical Properties of Silane Crosslinked EPDM", Polymer, 11(6), pp.547~556 (1987)
- Yeong-Soon Gal, "EPDM Rubber and Its Applications", Polymer Science and Technology, 109(3), pp.325~333 (1999)
- J. K. Kim, "Study on Manufacturing and Characteristics of Silicone", EPDM Rubber Blend, 2001, pp.25(3), 406~413