Resonant ultrasound spectroscopy measurement and modeling of additively manufactured octet truss lattice cubes

Tran, Brian; Fisher, Karl A.; Wang, Jenny; Divin, Chuck; Balensiefer, Gabriel J.; Townsend, Andrew

doi:10.1016/j.ndteint.2023.102870

Cited by 5 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Relatively large variations in mechanical properties within the samples of identical design groups were observed. These large intragroup variations are well-known in 3D-printed mesoscale lattice samples [52,53], which may be caused by manufacturing defects common for samples produced by SLM [54]. These large variations can be a cause for the lack of statistical significance.…”

Section: Discussionmentioning

confidence: 99%

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

Ye,

Babazadeh-Naseri,

Higgs III

et al. 2024

Materials

View full text Add to dashboard Cite

In this study, we compared the material properties of linearly and sharply graded Ti6Al4V additively manufactured samples to investigate whether the more severe discontinuities caused by sharp grading can reduce performance. We performed compression testing with digital image correlation (DIC) in two loading directions for each grading design to simulate iso-stress and iso-strain conditions. We extracted the elastic stiffness, yield strength, yield strain, and energy absorption capacity of each sample. In addition, we used micro-computed tomography (micro-CT) imaging to examine the printing quality and dimensional accuracy. We found that sharply graded struts have a 12.95% increase in strut cross-sectional areas, whereas linearly graded struts produced an average of 49.24% increase compared to design. However, sharply graded and linearly graded FGL samples do not have statistically significant differences in elastic stiffness and yield strength. For the iso-strain condition, the average DIC-corrected stiffnesses for linearly and sharply graded samples were 6.15 GPa and 5.43 GPa, respectively (p = 0.4466), and the yield stresses were 290.4 MPa and 291.2 MPa, respectively (p = 0.5734). Furthermore, we confirmed different types of printing defects using micro-CT, including defective pores and disconnected struts. These results suggest that the loss of material properties caused by manufacturing defects outweighs the adverse effects of discrete-grading-induced discontinuities.

show abstract

Section: Discussionmentioning

confidence: 99%

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

Ye,

Babazadeh-Naseri,

Higgs III

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…The second objective is to detect defects in the test samples. In Ti-553 octet truss lattice cubes, the number of missing lattices is negatively correlated with the resonance frequencies and the Young's modulus and Poisson ratio back-calculated from RUS [17]. Furthermore, EOS CoCr pristine lattices have been successfully distinguished from the defective ones where a number of struts were missing, by comparing the resonance frequencies of the first 225 modes [18].…”

Section: Introductionmentioning

confidence: 99%

Resonant Ultrasonic Testing can Quantitatively Assess the Microscopic Porosity of Complex-Shaped Additively Manufactured AlSi10Mg Components

Skiadopoulos,

Prato,

Bozek

et al. 2024

J Nondestruct Eval

View full text Add to dashboard Cite

The utility of resonant ultrasonic testing for quality control of complex-shaped additively manufactured (AM) components in terms of porosity variations is investigated. A fully noncontact test setup is used to investigate differences in the volumetric porosity between AM AlSi10Mg samples. A set of 96 samples with programmatically induced pores varying in nominal total porosity between 0% and 2% is tested: one half of the samples are prismatic, and the other half have a complex internal Triply Periodic Minimal Surface (TPMS) structure. In addition, a subset of the samples is scanned using X-ray micro-computed tomography (-CT). It is found that the resonance frequency corresponding to the 1 st compressional mode can predict the total nominal porosity even in TPMS samples. From statistical analysis, the smallest detectable porosity difference is found to be 0.25% for the prismatic samples and 0.5% for the TPMS samples. The experimental results agree well with the predictions of finite element (FE) simulations and analytical models. However, X-ray -CT appears to underestimate the porosity, possibly due to its inability to resolve the small pores. Our findings suggest that resonant ultrasonic testing can quantitatively assess the total porosity of AM parts having complex geometries.

show abstract

Spherical porous structures for axial compression

Li,

Gan,

et al. 2024

International Journal of Mechanical Sciences

View full text Add to dashboard Cite

Resonant ultrasound spectroscopy measurement and modeling of additively manufactured octet truss lattice cubes

Cited by 5 publications

References 12 publications

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

Resonant Ultrasonic Testing can Quantitatively Assess the Microscopic Porosity of Complex-Shaped Additively Manufactured AlSi10Mg Components

Spherical porous structures for axial compression

Contact Info

Product

Resources

About