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Damping and mode shape modification for additively manufactured walls with captured powder
Precision Engineering ( IF 3.6 ) Pub Date : 2020-07-28 , DOI: 10.1016/j.precisioneng.2020.07.002
Tony Schmitz , Michael Gomez , Barrett Ray , Eric Heikkenen , Kevin Sisco , Michael Haines , Jessica S. Osborne

This paper describes the fabrication, modeling, and dynamic testing of laser powder bed fusion stainless steel walls with captured powder cores. The purpose of the study is to determine the increased structural damping, or energy dissipation, and mode shape modification caused by the inclusion of the unmelted powder core within the solid walls. It is shown experimentally that the damping increases with larger powder core width and that the damping addition is mode dependent. Damping increases over the solid wall values by factors of 2.9–225 are reported depending on the mode number and core width. It is also seen that the mode shapes are distorted relative to the solid wall results as the core width is increased and wall thickness is decreased. Comparisons with finite element models confirm this trend.



中文翻译:

带有捕获粉末的增材制造墙的阻尼和模态形状修改

本文描述了带有捕获粉芯的激光粉末床熔合不锈钢墙的制造,建模和动态测试。该研究的目的是确定由于未熔化的压粉芯包含在实体壁中而导致的结构阻尼或能量耗散的增加以及模态形状的改变。实验表明,阻尼随着磁粉芯宽度的增大而增加,并且阻尼的增加与模式有关。据报道,取决于模数和芯宽,固体壁值的阻尼增加了2.9-225倍。还可以看到,随着纤芯宽度的增加和壁厚的减小,众数形状相对于实心壁变形。与有限元模型的比较证实了这一趋势。

更新日期:2020-07-28
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