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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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CRH2A型动车组缓冲梁结构焊接残余应力的有限元模拟*
DOI: 10.11900/0412.1961.2013.00832, PP. 944-954
Keywords: CRH2A型动车组,缓冲梁焊接结构,残余应力,有限元法,数值模拟
Abstract:
建立了缓冲梁结构焊接有限元模型,利用有限元法分析了焊接残余应力分布规律.结果表明应力模拟结果与采用压痕应变法实测结果吻合较好,模型可靠;缓冲梁下翼板边部和工艺孔区域存在较大且分布不均匀的焊接应力,工件挂的焊接对下翼板边部应力分布影响较大;采用A6N01铝合金代替A7N01铝合金作为母材可有效降低缓冲梁结构应力,当角补板和缓冲梁整体成型时,原焊缝附近的残余拉应力明显降低,采用双人对称同时施焊能显著降低缓冲梁下翼板的残余拉应力.
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