Evaluation of oil-leakage of multi-layered resin-hose clamped with metal nipple and sleeve

Kenta Matsuoka; Kazuya Okubo; Toru Fujii; Chihiro Nakamura; Yushi Fujishita; Fuko Kusu; Masato Matsushita; Ryota Yoshihara

doi:10.1117/12.2286239

22 March 2018 Evaluation of oil-leakage of multi-layered resin-hose clamped with metal nipple and sleeve

Kenta Matsuoka, Kazuya Okubo, Toru Fujii, Chihiro Nakamura, Yushi Fujishita, Fuko Kusu, Masato Matsushita, Ryota Yoshihara

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Proceedings Volume 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII; 105961U (2018) https://doi.org/10.1117/12.2286239
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States

Abstract

The purpose of this study is to investigate the path of occurred oil-leakage of multi-layered resin-hose as one of multifunctional materials around the caulked joint with a metal nipple and sleeve when excessive cyclic internal pressure was applied onto the hose. Equivalent cyclic axial tensile force was substitutively applied to the hose, where same degree of normal stress was produced in longitudinal direction. Excessive 3 and 5 times of the standard load was applied to the hose. Cyclic loading was paused at every 1000 and 10000 cycles and then designed internal pressure was applied to the hose by a hand-operated pump with water in order to check whether the leakage was occurred around the joint and surface of the hose for safety evaluation. Cyclic fatigue life was defined as the number of loading cycles in which the leakage and the initial damage which was the passage of the ultrasonic wave was observed on the cyclic test. Test results showed the fatigue life at which leakage of water was observed was increased 20 times in case of K=3 compared to that in case of K=5. The cycles of initial damage detected by the ultrasonic wave were passed was increased 3.3 times in case of K=3 compared to that in case of K=5. The fluorescent agent penetrated from the core layer of resin hose to the reinforcement layer in which a half cross section along longitudinal direction in failed specimens was observed after the leak test. The original specimens had the gap between the resin-hose and the nipple and then the gap extended and connected during fatigue cyclic. In this study, it was observed that oil was leaked through narrow gap between the nipple and core layer of resin hose.

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Kenta Matsuoka, Kazuya Okubo, Toru Fujii, Chihiro Nakamura, Yushi Fujishita, Fuko Kusu, Masato Matsushita, and Ryota Yoshihara "Evaluation of oil-leakage of multi-layered resin-hose clamped with metal nipple and sleeve", Proc. SPIE 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII, 105961U (22 March 2018); https://doi.org/10.1117/12.2286239

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KEYWORDS

Nipple

Ultrasonics

Metals

Safety

Mechanical engineering

Multifunctional materials

Nitrogen dioxide

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