{"title":"铝镁硅合金管在鼓胀过程中的低温失效行为","authors":"Xiaobo Fan, Xugang Wang, X. Chen, Shijian Yuan","doi":"10.1115/1.4064691","DOIUrl":null,"url":null,"abstract":"\n Cryogenic medium pressure forming has been developed to form the complex-shaped tubular components, in which the need shape and tube diameter directly determine the complex evolution of biaxial stress in bulging process. The superposition of biaxial stress and cryogenic temperature complicates the deformation behaviors, especially for the final fracture and bulging limit, which determine forming quality of components. Therefore, the effects of tube geometry on failure orientation and fracture strain of Al–Mg–Si alloy tubes under cryogenic biaxial stress was elucidated, by utilizing cryogenic free bulging with different length–diameter ratios. The failure orientations and corresponding damage modes under different bulging geometric conditions were revealed. The influence mechanism of tube geometry and temperature on the failure mode was analyzed theoretically. A fracture model was established to predict the fracture strain in cryogenic bulging. The failure mode changes from circumferential cracking to axial cracking with the decreasing length–diameter ratio, owing to the stress sequence reversal induced by the significant nonlinearity of stress path under small length–diameter ratio. And the failure mode can inverse under a larger length–diameter ratio of 1.0 at −196 °C because of the enhanced nonlinearity, which is promoted by the improved plasticity at cryogenic temperature. The established model based on the more accurate assessment of hardening ability during deformation can accurately predict the fracture strain with an average deviation of 10.6% at different temperatures. The study can guide deformation analysis and failure prediction in cryogenic forming of aluminum alloy tubular parts.","PeriodicalId":507815,"journal":{"name":"Journal of Manufacturing Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Cryogenic failure behaviors of Al-Mg-Si alloy tubes in bulging process\",\"authors\":\"Xiaobo Fan, Xugang Wang, X. Chen, Shijian Yuan\",\"doi\":\"10.1115/1.4064691\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n Cryogenic medium pressure forming has been developed to form the complex-shaped tubular components, in which the need shape and tube diameter directly determine the complex evolution of biaxial stress in bulging process. The superposition of biaxial stress and cryogenic temperature complicates the deformation behaviors, especially for the final fracture and bulging limit, which determine forming quality of components. Therefore, the effects of tube geometry on failure orientation and fracture strain of Al–Mg–Si alloy tubes under cryogenic biaxial stress was elucidated, by utilizing cryogenic free bulging with different length–diameter ratios. The failure orientations and corresponding damage modes under different bulging geometric conditions were revealed. The influence mechanism of tube geometry and temperature on the failure mode was analyzed theoretically. A fracture model was established to predict the fracture strain in cryogenic bulging. The failure mode changes from circumferential cracking to axial cracking with the decreasing length–diameter ratio, owing to the stress sequence reversal induced by the significant nonlinearity of stress path under small length–diameter ratio. And the failure mode can inverse under a larger length–diameter ratio of 1.0 at −196 °C because of the enhanced nonlinearity, which is promoted by the improved plasticity at cryogenic temperature. The established model based on the more accurate assessment of hardening ability during deformation can accurately predict the fracture strain with an average deviation of 10.6% at different temperatures. The study can guide deformation analysis and failure prediction in cryogenic forming of aluminum alloy tubular parts.\",\"PeriodicalId\":507815,\"journal\":{\"name\":\"Journal of Manufacturing Science and Engineering\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-02-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Manufacturing Science and Engineering\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1115/1.4064691\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Manufacturing Science and Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/1.4064691","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
低温中压成形已被开发用于成形形状复杂的管状部件,其中所需的形状和管径直接决定了鼓胀过程中双轴应力的复杂演变。双轴应力和低温温度的叠加使变形行为变得复杂,尤其是最终断裂和鼓包极限,这决定了部件的成型质量。因此,通过利用不同长径比的低温自由鼓胀,阐明了管材几何形状对低温双轴应力下铝镁硅合金管的破坏方向和断裂应变的影响。揭示了不同鼓胀几何条件下的破坏方向和相应的破坏模式。从理论上分析了管材几何形状和温度对破坏模式的影响机制。建立了预测低温鼓包断裂应变的断裂模型。随着长径比的减小,失效模式由周向开裂转变为轴向开裂,这是由于在小长径比条件下,应力路径的显著非线性引起了应力序列逆转。而在 -196 °C 时,由于低温塑性的改善,非线性增强,在较大的长径比(1.0)条件下,失效模式可以逆转。所建立的模型基于对变形过程中硬化能力的更精确评估,可准确预测不同温度下的断裂应变,平均偏差为 10.6%。该研究可为铝合金管状零件低温成形的变形分析和失效预测提供指导。
Cryogenic failure behaviors of Al-Mg-Si alloy tubes in bulging process
Cryogenic medium pressure forming has been developed to form the complex-shaped tubular components, in which the need shape and tube diameter directly determine the complex evolution of biaxial stress in bulging process. The superposition of biaxial stress and cryogenic temperature complicates the deformation behaviors, especially for the final fracture and bulging limit, which determine forming quality of components. Therefore, the effects of tube geometry on failure orientation and fracture strain of Al–Mg–Si alloy tubes under cryogenic biaxial stress was elucidated, by utilizing cryogenic free bulging with different length–diameter ratios. The failure orientations and corresponding damage modes under different bulging geometric conditions were revealed. The influence mechanism of tube geometry and temperature on the failure mode was analyzed theoretically. A fracture model was established to predict the fracture strain in cryogenic bulging. The failure mode changes from circumferential cracking to axial cracking with the decreasing length–diameter ratio, owing to the stress sequence reversal induced by the significant nonlinearity of stress path under small length–diameter ratio. And the failure mode can inverse under a larger length–diameter ratio of 1.0 at −196 °C because of the enhanced nonlinearity, which is promoted by the improved plasticity at cryogenic temperature. The established model based on the more accurate assessment of hardening ability during deformation can accurately predict the fracture strain with an average deviation of 10.6% at different temperatures. The study can guide deformation analysis and failure prediction in cryogenic forming of aluminum alloy tubular parts.