Fatigue analysis of a hydraulic accumulator under severe working conditions
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초록
A hydraulic accumulator is a key component that absorbs the shock and vibrations of a hydraulic system of a marine diesel engine and controls the volume change according to the pressure change of the hydraulic oil. During the operation of a hydraulic accumulator, repeated concentrated stress is applied to the lowermost thread of the lower shell. The purpose of this study is to numer-ically investigate the structural safety and fatigue life for hydraulic accumulators under extreme pressure conditions. Structural and fatigue analysis were performed using finite element modeling under the operating conditions and test conditions of 30MPa and 40MPa pressure, respectively. As a result of the structural analysis, the maximum von Mises stress did not exceed the tensile strength under the operating conditions, whereas the von Mises stress of 1029 MPa under the test conditions exceeded the tensile strength: thus, the structural stability was not secured. The fatigue life was calculated using fatigue analysis with a design life of 106. Further, fatigue failure occurred within a short duration as it represented 160 cycles.
Abstract
A hydraulic accumulator is a key component that absorbs the shock and vibrations of a hydraulic system of a marine diesel engine and controls the volume change according to the pressure change of the hydraulic oil. During the operation of a hydraulic accumulator, repeated concentrated stress is applied to the lowermost thread of the lower shell. The purpose of this study is to numer-ically investigate the structural safety and fatigue life for hydraulic accumulators under extreme pressure conditions. Structural and fatigue analysis were performed using finite element modeling under the operating conditions and test conditions of 30MPa and 40MPa pressure, respectively. As a result of the structural analysis, the maximum von Mises stress did not exceed the tensile strength under the operating conditions, whereas the von Mises stress of 1029 MPa under the test conditions exceeded the tensile strength: thus, the structural stability was not secured. The fatigue life was calculated using fatigue analysis with a design life of 106. Further, fatigue failure occurred within a short duration as it represented 160 cycles.
참고문헌 (8)
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