| Summary: | 碩士 === 義守大學 === 機械與自動化工程學系 === 107 === Nickel-chromium-molybdenum alloy steel pipe with excellent yield point and tensile strength has been widely used in transmission shafts, spindles, guns and other components. In response to the policy of weapons made by self in the future, this study aims to use the autofrettage stress analysis on the 120 mm nickel-chromium- molybdenum alloy steel smoothbore gun manufactured by Rheinmetall and explores the effect of autofrettage influencing on the firing stress of the gun. The stress analysis method, element unit method, the Le Duc method and the Rheinmetall autofrettage stress algorithm are used for calculation and analysis.
The preliminary results about autofrettage stress and thickness percentage for the specific case are as follows:
(1) Obtain the effect of autofrettage on the firing stress, and the residual stress counteracts the firing stress so that the gun is in a safe range.
(2) Obtain the effect of the percentage of autofrettage on the firing stress, and get a suitable autofrettage thickness percentage is about 50% to 60% after analysis.
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