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Defects in Electron Beam Melted Ti-6Al-4V: Fatigue Life Prediction Using Experimental Data and Extreme Value Statistics

机译:电子束中的缺陷熔化Ti-6Al-4V:使用实验数据和极值统计数据的疲劳寿命预测

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摘要

Electron beam melting is a powder bed fusion (PBF) additive manufacturing (AM) method for metals offering opportunities for the reduction of material waste and freedom of design, but unfortunately also suffering from material defects from production. The stochastic nature of defect formation leads to a scatter in the fatigue performance of the material, preventing wider use of this production method for fatigue critical components. In this work, fatigue test data from electron beam melted Ti-6Al-4V specimens machined from as-built material are compared to deterministic fatigue crack growth calculations and probabilistically modeled fatigue life. X-ray computed tomography (XCT) data evaluated using extreme value statistics are used as the model input. Results show that the probabilistic model is able to provide a good conservative life estimate, as well as accurate predictive scatter bands. It is also shown that the use of XCT-data as the model input is feasible, requiring little investigated material volume for model calibration.
机译:电子束熔化是一种粉末床融合(PBF)添加剂制造(AM)金属的方法,为减少材料废物和设计自由提供机会,但遗憾的是也患有生产材料缺陷。缺陷形成的随机性质导致材料的疲劳性能散射,防止这种生产方法用于疲劳关键组分。在这项工作中,将来自电子束的疲劳试验数据熔化从原木加工的Ti-6Al-4V样品进行比较,以确定疲劳裂纹生长计算和概率模型的疲劳寿命。使用极值统计评估的X射线计算机断层扫描(XCT)数据用作模型输入。结果表明,概率模型能够提供良好的保守生活估计,以及准确的预测散射带。还表明,使用XCT数据作为模型输入是可行的,需要很少的调查材料体积进行模型校准。

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