An Investigation into Free Flexural Vibration of Defective ۳D-PrintedPLA Beams with Embedded Delamination

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شناسه ملی سند علمی:

INCWI23_051

تاریخ نمایه سازی: 16 اسفند 1401

چکیده مقاله:

Polylactic acid (PLA), is a versatile, thermoplastic, biodegradable, and oneof the most eco-friendly polymers widely used in ۳D printing and manufacturing ofelements used in healthcare, textile, packaging, bio-medical devices, as well as low-costbio-composite materials used in aerospace structural components. Therefore, thecharacterization of the filaments and the printed parts is essential for determiningquality, controlling manufacturing processes, and making accurate model predictions ofprocedure and product performance. In the present study, the flexural vibration analysisof a defective ۳D-printed PLA beam will be presented. Experimental and FEM-basednumerical free vibration analyses of a cantilever beam specimen, with embeddeddelamination, are presented. The defect is a single, symmetric, through-the-width,centrally located, delamination, covering one-third of the beam’s length. The averageexperimental frequency values are calculated based on three different trials, conductedto ensure the accuracy of the obtained results. Numerical results, including fundamentalflexural frequencies and corresponding mode shapes, obtained through simulationscarried out using Finite Element Analysis (FEA) software are also reported anddiscussed. The comparison is made between the frequency results obtained from twonumerical (FEM) models and the experimental ones. The first FEM model assumed auniform delamination zone, whereas the second one was created considering thenonuniformity of the defective region. It is observed that the numerical natural frequencyobtained from the latter model corresponds better with the experimental values.

نویسندگان

Seyed M Hashemi

Professor, Department of Aerospace Engineering, Toronto Metropolitan University,Toronto (ON), Canada

Bhargava Ram Mudumby

MEng graduate student, Department of Aerospace Engineering, Toronto MetropolitanUniversity, Toronto (ON), Canada