Evaluation of the structural integrity and fatigue life of a hydraulic accumulator used for marine diesel engine according to the thread root radius
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A hydraulic accumulator can dampen the sudden pressure shock, pulsation, and pressure spike in marine diesel engines. During the operation of a hydraulic accumulator, the thread of its lower shell is subjected to concentrated stress. The purpose of this study is to numerically investigate the structural safety and fatigue life of a hydraulic accumulator according to the thread root radius and friction coefficient using three different models of the lower shells, with thread root radii of 0.1, 0.2, and 0.4 mm. The hydraulic accumulator was analyzed by a static analysis of the lower shell, upper shell, and thread, where stress is concentrated under a 300 bar pressure, using the finite element method. Results shows that the general primary membrane stress and primary bending stress do not exceed the allowable stress. Furthermore, fatigue life evaluation shows that the fatigue life increases with the thread root radius and friction coefficient under severe and abnormal service conditions of a hydraulic accumulator used for marine diesel engines.
Abstract
A hydraulic accumulator can dampen the sudden pressure shock, pulsation, and pressure spike in marine diesel engines. During the operation of a hydraulic accumulator, the thread of its lower shell is subjected to concentrated stress. The purpose of this study is to numerically investigate the structural safety and fatigue life of a hydraulic accumulator according to the thread root radius and friction coefficient using three different models of the lower shells, with thread root radii of 0.1, 0.2, and 0.4 mm. The hydraulic accumulator was analyzed by a static analysis of the lower shell, upper shell, and thread, where stress is concentrated under a 300 bar pressure, using the finite element method. Results shows that the general primary membrane stress and primary bending stress do not exceed the allowable stress. Furthermore, fatigue life evaluation shows that the fatigue life increases with the thread root radius and friction coefficient under severe and abnormal service conditions of a hydraulic accumulator used for marine diesel engines.
참고문헌 (8)
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