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首页> 外文期刊>Engineering failure analysis >Prediction of chevron crack initiation in inclusion copper shaped-wire drawing
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Prediction of chevron crack initiation in inclusion copper shaped-wire drawing

机译：夹杂铜异形拉丝中人字形裂纹萌生的预测

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摘要

In the copper superfine wire drawing, the internal cracks such as chevron cracks and breakage of the wire were fatal to the success of quantitative drawing operations. This paper shows how four of the main process parameters, the position, size and shape of an inclusion and drawing pass numbers, influence the plastic deformation, hydrostatic stress, maximum principal tensile stress and chevron cracks initiation by FEM simulation. The influence of the central and non-central cylindrical inclusion in the single-pass copper shaped-wire drawing was investigated. Influence of a central elliptical inclusion in the single-pass copper shaped-wire drawing was also investigated and compared. The effect of the lateral and longitudinal sizes of a central cylindrical inclusion in the multi-pass copper shaped-wire drawing was carried out. The plastic deformation, plastic strain, hydrostatic stress and maximum principal tensile stress of the copper shaped-wire containing an inclusion were obtained for the drawing condition, position, size and shape of the inclusion mentioned above. A ductile fracture criterion was chosen from literature, a large number of ductile fracture initiation criteria, to predict the chevron crack initiation of the drawn copper shaped-wire for this investigation. The problem of chevron cracks initiation for the investigated material was solved. This investigation gives very good results.
机译：在铜超细拉丝中，内部裂缝（例如V形裂缝和金属丝的断裂）对定量拉丝操作的成功至关重要。本文通过有限元模拟显示了四个主要工艺参数（夹杂物的位置，大小和形状以及拉拔道次数）如何影响塑性变形，静水应力，最大主拉伸应力和人字形裂纹萌生。研究了中心和非中心圆柱夹杂在单道次铜异形拉丝中的影响。还研究并比较了中心椭圆形夹杂物对单道铜异形拉丝的影响。在多道次铜异形拉丝中进行了中心圆柱形夹杂物的横向和纵向尺寸的影响。对于上述夹杂物的拉伸条件，位置，大小和形状，求出了包含夹杂物的铜异形线的塑性变形，塑性应变，静水应力和最大主拉伸应力。从文献中选择了韧性断裂标准，即大量的韧性断裂起始标准，以预测用于该研究的拉制铜异形线的人字形裂纹起始。解决了所研究材料的人字形裂纹引发问题。这项调查给出了很好的结果。

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