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首页> 外文期刊>Journal of Nondestructive Evaluation >A Study on the Use of XCT and FEA to Predict the Elastic Behavior of Additively Manufactured Parts of Cylindrical Geometry
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A Study on the Use of XCT and FEA to Predict the Elastic Behavior of Additively Manufactured Parts of Cylindrical Geometry

机译：XCT和FEA使用XCT和FEA预测圆柱形几何构造件的弹性行为

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Defining general criteria for the acceptability of defects within industrial components is often complicated, since the specific load conditions and the criticality of the given application should be considered individually. In order to minimize the risk of failure, high safety factors are commonly adopted during quality control. However this practice is likely to cause the rejection of components whose defects would be instead acceptable if a more sound knowledge of the component behaviour were achieved. Parts produced by additive manufacturing (AM) may suffer from various defects, including micro- or macro-holes, delamination and microstructural discontinuities. Such processes, which are specially suitable for one-off components, require robust and reliable inspection before a part is accepted or rejected, since the refusal of even a single part at the end of the production process represents a significant loss. For this reason, it would be very useful to simulate in a reliable way whether a certain defect is truly detrimental to the proper working of the part during operation or whether the component can still be used, despite the presence of a defect. To this purpose, the paper highlights the benefits of a synergistic interaction between Industrial X-ray computed tomography (XCT) and finite element analysis (FEA). Internal defects of additively manufactured parts can be identified in a non-destructive way by means of XCT. Then FEA can be performed on the XCT-based virtual model of the real component, rather than on the ideal CAD geometry. A proof of concept of this approach is proposed here for a reference construct produced in an Aluminium alloy by AM. Numerical results of the proposed combined XCT-FEA procedure are contrasted with experimental data from tensile tests. The findings sustain the reliability of the method and allow to assess its full provisional accuracy for parts of cylindrical geometry designed to operate in the elastic field. The paper moves a step beyond the present application limits of tomography as it is currently employed for AM parts and it evidences instead the possibility of extending the usage of tomography to acceptance testing and prediction of operative behaviour.
机译：定义工业部件内缺陷可接受性的一般标准通常复杂，因为特定的负载条件和给定申请的临界应单独考虑。为了最大限度地减少故障风险，在质量控制期间通常采用高安全性因素。然而，如果实现了组件行为的更好的了解，这种做法可能会导致拒绝缺陷所能接受的组件。添加剂制造（AM）产生的部件可能患有各种缺陷，包括微观或宏观孔，分层和微观状不连续性。在接受或被拒绝之前，特别适用于一次性组分的这种方法需要鲁棒和可靠的检查，因为在生产过程结束时甚至是单个部分的拒绝代表显着的损失。因此，尽管存在缺陷，以可靠的方式模拟某些缺陷真正有害的可靠方式是非常有用的。为此目的，本文突出了工业X射线计算机断层扫描（XCT）与有限元分析（FEA）之间协同相互作用的益处。通过XCT以非破坏性的方式识别加成制造部件的内部缺陷。然后可以在真实组件的基于XCT的虚拟模型上执行FEA，而不是在理想的CAD几何体上执行。此处提出了这种方法的概念证明，用于AM铝合金中产生的参考构建体。提出的XCT-FEA程序的数值结果与来自拉伸试验的实验数据形成鲜明对比。该研究结果维持了该方法的可靠性，并允许评估其圆柱形几何部件的全部临时精度，旨在在弹性场中操作。该论文超越了本申请层析术的步骤，因为它目前用于AM零件和IT证据，而是可能延长分层扫描的使用以接受测试和预测的操作行为。

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