Scholarlink

<p>Metal additive manufacturing is a promising technology that allows metal to be formed into complex geometries that were never possible with subtractive manufacturing. However, research has shown that the final product contains a residual stress profile, behaves anisotropic, and has inconsistencies in the microstructure which hinder its adoption into critical components. To help fill this gap, a total of 14 “identical” stainless steel and aluminum beams are fabricated using Laser Power Bed Fusion and traditional sheet metal manufacturing, to access the variability in their linear and nonlinear dynamical responses. In this work, two experimental setups are considered and designed to either enhance or mitigate the effects the accelerometer’s mass has on the beams. Analyzing the qualitative data obtained in free vibration tests reveals that the accelerometer’s mass does not have a significant effect on the beams’ fundamental frequency nor the normalized effective damping ratio. Instead, it is found that that each “identical” system has a unique dynamic profile that changes dependent on the level of excitation in which the additively-manufactured beams exhibit more variability. The broadband frequency is excited using random vibration, revealing that modes 1, 2, and 5 exhibit dominant out-of-plane bending. The higher-order modes result in more nonlinear behavior, and the stainless-steel structures show higher peak frequencies compared to the aluminum ones. Since neither experimental setup seems to have a large effect on the parts responses, one of them is selected so all the beams could be subjected to controlled-stepped sine harmonic testing for a quantitative analysis. The results from three increasing excitation levels confirm the qualitative trends and reveal that the additively-manufactured beams have a more pronounced nonlinear softening backbone. This trend is present for both materials, confirming that the manufacturing technique has a more significant effect on the nonlinear responses than the material’s type.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Characterizing the vibrational properties and reproducibility of subtractively- and additively-manufactured metallic beams

  • 期刊论文

  • 发表日期：

    2026年4月10日

查看全文
  • N. Hall,
  • D. Binns,
  • M. Fountain,
  • A. Abdelkefi

摘要

Metal additive manufacturing is a promising technology that allows metal to be formed into complex geometries that were never possible with subtractive manufacturing. However, research has shown that the final product contains a residual stress profile, behaves anisotropic, and has inconsistencies in the microstructure which hinder its adoption into critical components. To help fill this gap, a total of 14 “identical” stainless steel and aluminum beams are fabricated using Laser Power Bed Fusion and traditional sheet metal manufacturing, to access the variability in their linear and nonlinear dynamical responses. In this work, two experimental setups are considered and designed to either enhance or mitigate the effects the accelerometer’s mass has on the beams. Analyzing the qualitative data obtained in free vibration tests reveals that the accelerometer’s mass does not have a significant effect on the beams’ fundamental frequency nor the normalized effective damping ratio. Instead, it is found that that each “identical” system has a unique dynamic profile that changes dependent on the level of excitation in which the additively-manufactured beams exhibit more variability. The broadband frequency is excited using random vibration, revealing that modes 1, 2, and 5 exhibit dominant out-of-plane bending. The higher-order modes result in more nonlinear behavior, and the stainless-steel structures show higher peak frequencies compared to the aluminum ones. Since neither experimental setup seems to have a large effect on the parts responses, one of them is selected so all the beams could be subjected to controlled-stepped sine harmonic testing for a quantitative analysis. The results from three increasing excitation levels confirm the qualitative trends and reveal that the additively-manufactured beams have a more pronounced nonlinear softening backbone. This trend is present for both materials, confirming that the manufacturing technique has a more significant effect on the nonlinear responses than the material’s type.