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Influence of variations in geometric parameters and an alternative design for improved fatigue life of a mining dragline joint

机译:几何参数变化的影响以及改善采矿拉铲接头疲劳寿命的替代设计

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摘要

Mining dragline joints are observed to develop fatigue induced cracks in operation in field, which are further compounded by the effects of weld-generated residual stresses. A typical dragline used in the Australian coal mining industry is fabricated in situ with heavily overlapped welded joints (called clusters) having several co-eccentric side-bracings welded directly onto the three main chords that form the dragline boom. It is estimated that the fatigue crack initiation process is exacerbated by heavy overlaps and excessive rigidity created at the joint node by the current design, which is often based more on practical experience in field than following any design standards rigorously. This paper investigates the influence of variation in four geometric parameters of the current design of joint All of a typical BE 1370 dragline boom, and concludes that the parameter that influences stresses at weld toes the most is the eccentricity of the node. It also proposes an innovative design that stipulates welding the side-bracings onto a sleeve structure which is friction connected rather than welded to the main chords directly. This design avoids the hard points associated with welding on the highly stressed main chords and should thus increase fatigue life dramatically.
机译:观察到开采拉铲缝在野外作业时会产生疲劳引起的裂纹,这种裂纹还会因焊接产生的残余应力而进一步加剧。澳大利亚煤炭开采业中使用的典型拉铲是在原地制造的,焊接接头(称为簇)的重迭部分具有多个同心偏侧支架,直接焊接在形成拉铲吊杆的三个主弦上。据估计,当前设计在接头节点处产生大量重叠和过大的刚性会加剧疲劳裂纹的萌生过程,这通常更多地基于现场实践经验,而不是严格遵循任何设计标准。本文研究了当前关节设计中四个几何参数变化的影响。所有典型的BE 1370拉铲吊臂都得出结论,影响焊趾应力的参数最大的是节点的偏心距。它还提出了一种创新的设计,规定将侧支架焊接到套筒结构上,该套筒结构是摩擦连接的,而不是直接焊接到主弦上。这种设计避免了与在高应力主弦上焊接相关的硬点,因此应显着增加疲劳寿命。

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