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UID:event-53@tuemeche.nl
DTSTAMP:20261008T003012Z
DTSTART;TZID=Europe/Amsterdam:20261001T093000
DTEND;TZID=Europe/Amsterdam:20261001T120000
SUMMARY:A study on energy dissipation in additively manufactured beams wi
 th powder-filled cavities: experimental characterization and modeling dir
 ections.
DESCRIPTION:Speaker: Roy van den Putte\nHost: Erik Steur\n\nThe increasin
 g performance demands of high-performance mechatronic systems require str
 uctures that combine low mass\, high stiffness\, and damping. Additive ma
 nufacturing\, particularly Laser Powder Bed Fusion (LPBF)\, enables the i
 ntegration of powder-filled cavities that can provide passive damping wit
 hout additional components. However\, the underlying energy dissipation m
 echanism is not yet sufficiently understood.\nThis thesis investigates th
 e modal damping behavior of LPBF-manufactured beam specimens containing p
 owder-filled cavities. Force-amplitude-controlled stepped-sine excitation
 s and frequency response function measurements were used to experimentall
 y characterize the nonlinear\, force-amplitude-dependent damping. Specime
 ns with varying cavity heights and positions were investigated. In additi
 on\, finite element analysis was performed to determine the strain distri
 bution around the cavities.\nThe experiments showed that damping increase
 s with excitation force amplitude and approaches a constant value at high
  amplitudes. Cavity position along the beam length was identified as the 
 most influential design parameter\, with maximum damping occurring near r
 egions of maximum modal strain. Higher cavities also increased damping by
  extending into regions of enhanced strain. Comparison with an empty cavi
 ty confirmed that the damping originates from the enclosed powder. The re
 sults support a friction-based energy dissipation mechanism caused by int
 eractions between powder particles and the cavity walls. Based on these f
 indings\, a numerical modeling approach combining FE structural dynamics 
 with friction models such as the Iwan or Jenkins model is proposed.
LOCATION:Pendulum 3.26
URL:https://tuemeche.nl/peoplepages/event.php?id=53
CATEGORIES:MSc Thesis Defense
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