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Validation of predictive approaches for ductile fracture in cold extrusion

机译：冷挤压韧性裂缝预测方法的验证

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Cold extrusion is sometimes accompanied by some bypical internal defects, known in the technical literature as "central bursts". which dramatically could affect the component behaviour during its service life. Several researchers, following both analytical and numerical approaches have attempted central bursting prediction in extrusion. Among the latter several approaches have been proposed in the literature, namely the ones based on the use of ductile fracture criteria and the ones founded on the damage mechanics analysis. Each one of these approaches presents some advantages and drawbacks. In the paper the authors analyze a set of cold extrusion processes on AISI 1040 specimens at varying the most relevant process parameters. The occurrence of central bursting has been predicted utilizing all the classes of approach previously mentioned and the goodness of the predictions has been validated through a set of experimental tests. On the basis of this validation the usefulness and the industrial suitability of each approach is discussed.
机译：冷挤出有时伴有一些现代内部缺陷，在技术文献中已知为“中央爆发”。这急剧地影响在其使用寿命期间的组件行为。若干研究人员，分析和数值方法都试图在挤出中进行中央爆破预测。在后一种方法中，在文献中已经提出了几种方法，即基于使用延性骨折标准和在损伤力学分析上创建的方法。这些方法中的每一个都具有一些优点和缺点。本文在AISI 1040标本上分析了一组冷挤出过程，改变了最相关的工艺参数。已经预测了中央突发的发生，利用先前提到的所有方法，并且通过一组实验测试已经验证了预测的良好。在验证的基础上，讨论了每个方法的有用性和工业适应性。

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