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Rapid initiation and growth life characterization of additively manufactured alloy 718 through compliance monitoring
Extreme Mechanics Letters ( IF 4.7 ) Pub Date : 2020-06-26 , DOI: 10.1016/j.eml.2020.100856
Luke Sheridan , Joy E. Gockel , Onome E. Scott-Emuakpor

Additive manufacturing offers significant design versatility which can be leveraged for complex geometries and microstructural tailoring through the manipulation of numerous process parameters. Structurally critical components require significant material characterization and qualification for each material iteration. Traditional methods for characterizing fatigue performance of materials is expensive and time consuming, so new test methods to rapidly quantify important fatigue characteristics and behavior is necessary to supplement standard data and increase the production of fatigue data for advanced alloys. Toward this end, specimen compliance is initially investigated to detect crack initiation in AM components under fatigue loading. Initial results indicate that this method detects crack initiation earlier and cheaper than optical or thermal imaging methods. The observations made in this investigation provide valuable insight on the dependence of fatigue initiation and growth life on applied stress and pore size which is critical for designing for AM components.



中文翻译:

通过顺应性监控快速评估增材制造合金718的起爆和生长寿命

增材制造提供了显着的设计多功能性,可通过操纵许多工艺参数来利用其实现复杂的几何形状和微结构剪裁。结构关键的组件需要对每个材料迭代进行重要的材料表征和鉴定。传统的表征材料疲劳性能的方法既昂贵又费时,因此需要新的测试方法来快速量化重要的疲劳特性和行为,以补充标准数据并增加先进合金的疲劳数据的产生。为此,最初研究了试样的柔度,以检测疲劳载荷下增材制造部件中的裂纹萌生。初步结果表明,该方法比光学或热成像方法更早,更便宜地检测到裂纹萌生。这项研究中的观察结果提供了关于疲劳萌生和生长寿命对施加的应力和孔径的依赖性的宝贵见解,这对于AM组件的设计至关重要。

更新日期:2020-06-26
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