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Root cracking in tubular joints with enhanced partial joint penetration welds

机译：局部焊缝熔深增强的管状接头的根部开裂

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摘要

This paper presents the experimental and numerical investigation on the fatigue cracking at thernroot of the enhanced partial joint penetration (PJP+) welds in the circular hollow section X-joint specimensrnsubjected to constant-amplitude brace in-plane bending actions. The PJP+ welds, which include a portion ofrnthe brace wall as the inherent “back-plate”, reduce the workmanship requirement on the welding procedure andrnimprove the quality control of the welded joint. This study compares the fatigue crack developments observedrnat both the weld toe and the weld root in two large-scale X-joint specimens with different post-weld surfacerntreatments. Root cracking is hardly observed in as-welded tubular X-joint specimens without post-weld surfacerntreatment, in which the fatigue life depends on the toe failure. In specimens with post-weld grinding treatmentsrnto enhance fatigue resistance of the material near the weld toe, however, the finite-length root face triggers therninitiation and propagation of fatigue cracks, but with an applied number of cycles more than that required torninitiate a toe crack in the identical as-welded tubular X-joint.
机译：本文对圆形中空截面X形接头试样在等幅撑杆面内弯曲作用下增强的局部接头熔透（PJP +）焊缝的根部疲劳裂纹进行了实验和数值研究。 PJP +焊缝包括支撑壁的一部分作为固有的“背板”，降低了焊接程序的工艺要求，并改善了焊接接头的质量控制。这项研究比较了在两个采用不同的焊后表面处理的大型X接头试样中，在焊趾和焊根处观察到的疲劳裂纹发展。如果不进行焊后表面处理，则在焊接后的管状X接头试样中几乎看不到根部开裂，在这种情况下，疲劳寿命取决于趾的破坏。为了提高焊趾附近材料的抗疲劳性，在进行焊后磨削处理的试样中，有限长度的根面会触发疲劳裂纹的产生和扩展，但是施加的循环次数要多于使脚趾裂纹产生裂纹的次数。在相同的焊接管状X形接头中。

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  • 来源
    《Tubular structures XIV》|2012年|337-344|共8页
  • 会议地点 London(GB)
  • 作者

    P.W. Marshall; X. Qian; Y. Petchdemaneegam; C.T. Thang;

  • 作者单位

    MHP Systems Engineering, Houston, Texas, US Department of Civil and Environmental Engineering, National University of Singapore, Singapore;

    Department of Civil and Environmental Engineering, National University of Singapore, Singapore;

    Department of Civil and Environmental Engineering, National University of Singapore, Singapore;

    Civil Engineering Department, Duy Tan University, Vietnam;

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  • 正文语种 eng
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