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陈团海, 陈国明. T型焊接管节点应力集中系数数值分析[J]. 焊接学报, 2010, (11): 45-48.
引用本文: 陈团海, 陈国明. T型焊接管节点应力集中系数数值分析[J]. 焊接学报, 2010, (11): 45-48.
CHEN Tuanhai, CHEN Guoming. Numerical analysis on stress concentration factors of joints in welded T-tube[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (11): 45-48.
Citation: CHEN Tuanhai, CHEN Guoming. Numerical analysis on stress concentration factors of joints in welded T-tube[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (11): 45-48.

T型焊接管节点应力集中系数数值分析

Numerical analysis on stress concentration factors of joints in welded T-tube

  • 摘要: 针对目前T型焊接管节点应力集中系数(stress concentration factor,SCF)计算方法的不足,提出一种新的SCF数值计算方法.借助于有限元软件ANSYS中子模型技术,同时采用实体单元和壳单元模拟管节点;根据规范建立焊接接头模型,考虑焊址打磨对应力集中的缓和作用,建立打磨圆角模型以真实反应焊缝附近的应力分布;利用路径映射技术分析应力沿支管轴向的变化规律,采用路径分析方法确定名义应力和热点应力,从而求得SCF.最后采用该方法对15个T型焊接管节点在轴向载荷、面内弯矩和面外弯矩作用下的SCF进行分析,研究了3种基本载荷作用下几何参数对SCF大小与沿焊址分布的影响规律.

     

    Abstract: A new numerical method to calculate the stress concentration factors(SCF) of T-joints in welded T-tube was proposed in view of the disadvantages of the present methods.By virtue of submodel technology in ANSYS,both shell and solid elements were used to simulate joints in welded T-Tube.The welded joint models were established according to AWS specifications.In order to reflect the stress distribution along the weld toe more accurately,the weld profiles including the grinding weld toe which could mitigate stress concentration effectively were modeled.The path mapping technology was used to describe the stress distribution along the brace,and then the nominal stress and hot spot stress were used to calculate SCF through path analysis.Finally,through numerical analysis of 15 T-joints in welded tube with different parameters under axial loading,in-plane bending and out-of-plane bending,the effects of geometrical parameters on the SCF values and distributions under different kinds of load were investigated.

     

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