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91.
加载方式对黏性介质外压缩径成形的影响 总被引:3,自引:1,他引:2
采用有限元方法分析了加载方式(即注入加载通道的直径和数量)对黏性介质外压缩径过程黏性介质压力场及坯料的失稳起皱过程中压应力变化的影响,并对有限元分析结果进行了验证。研究结果表明,注入黏性介质的加载通道直径较大、数量较多,有利于改善黏性介质压力场的分布,延缓坯料失稳的产生,提高褶皱可消除程度。 相似文献
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汽车侧围尾灯位置的翻边结构由于点焊焊钳空间的需求容易导致成形起皱和外观圆角不顺的质量问题,在冲压工艺上通过减小过拉伸量或夹料翻边,在制件设计上通过减少翻边角度和增加吸皱特征可以有效解决此类问题. 相似文献
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Ruipengyu Li Weeratunge Malalasekera Salah Ibrahim 《International Journal of Hydrogen Energy》2018,43(34):16667-16683
There is a growing need to understand and estimate the explosion hazards associated with hydrogen storage and utilisation. This paper presents a comprehensive numerical study on the explosion characteristics of a lean hydrogen-air mixture in a small-scale obstructed vented chamber. The large eddy simulation (LES) technique is employed to study the highly unsteady turbulence-driven explosion when the flame propagates past successive obstructions. A dynamic flame surface density (DFSD) model is applied to the filtered chemical source term in the LES to account for the progressive wrinkling of the deflagrating flame. The driving mechanism of pressure rise and the underlying physics of flame-obstacle interactions are illustrated using the detailed LES results. The paper considers 11 individual flow experimental configurations of various obstacle number, size and location. They are further classified into six groups to investigate the influence of the level of blockage and the separation distance between adjacent obstructions. Critical safety-related parameters including the maximum overpressure and its incidence time are analysed. A comparison with propane is also made to highlight the substantial overpressure and flame acceleration of hydrogen deflagrations. Satisfactory agreements have been obtained between the LES and the experimental data, and this confirms the capability of the developed computational models in capturing essential explosion features and information for the study of vented hydrogen explosions. 相似文献
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目的 选用充液拉深先进成形技术制备钛/铁复合板平底球形薄壁件,并研究其充液拉深变形行为,以解决传统拉深工艺制备平底球形薄壁件极易产生褶皱的问题。方法 对钛/铁复合板平底球形薄壁件在不同液压力、压边间隙及凸模与板料间摩擦因数等工艺参数下的充液拉深过程进行数值模拟。对数值模拟结果进行分析,讨论工艺参数对零件成形性能的影响以及抑制起皱的机理。最后在不同拉深工艺下进行成形试验,制备钛/铁复合板平底球形薄壁件并与数值模拟结果进行对比。结果 数值模拟和成形试验结果表明,传统拉深工艺制备的钛/铁复合板平底球形薄壁件出现了明显的褶皱,采用充液拉深工艺可以有效解决零件侧壁起皱的问题。增大液压力、减小压边间隙或增大凸模与板料间摩擦因数会导致零件减薄率的提高并降低零件侧壁起皱的风险。在压边间隙1.5 mm、液压力25 MPa的条件下,采用充液拉深工艺可以制备出侧壁无褶皱的平底球形薄壁件。结论 通过充液拉深工艺可以有效解决钛/铁复合板平底球形薄壁件成形过程中起皱的问题。 相似文献
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Although, lightweight composite structures like sandwich panels and fiber metal laminates (FMLs) are greatly used as a superior material to produce modern structures to provide a substitutive item for monolithic metallic parts, but still there are some challenges in their forming process. There are some inherent limitations for forming FML parts. Also, because the strain of the fibers is limited, conventional approaches are not appropriate for forming complex-shaped laminate parts. Understanding the material behavior during the forming process is critical to find a new technique for relatively intricate and smaller FML parts. To understand the material behavior to present a new forming method, the finite element software and experiments are utilized and the thinning of layer thickness, stress distributions in different layers, and the fiber orientation are studied. Blanks made of intermittent glass fabric/fibers and Al 2024-O alloy sheets. The behavior of the material was appraised utilizing ABAQUS according to Hill yield criteria and then evaluated with the empirical outcomes. Results exhibited that FML parts manufactured by utilizing multilayer hydroforming can enhance the FML applications. 相似文献