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**RESCHEDULED! Mechanical Engineering MS Thesis Defense by Mr. Jared Correia

When: Tuesday, October 19, 2021
11:00 AM - 1:00 PM
Where: > See description for location
Description: Please NOTE:
The original date of 9/14/21 has been cancelled and is rescheduled to 10/19/21!

Mechanical Engineering MS Thesis Defense by Mr. Jared Correia

October 19, 2021

11:00 a.m. - 1:00 p.m.

Join Zoom Meeting

Please contact the MS Thesis Advisor for Meeting ID and Passcode.


A comprehensive experimental impact characterization study of novel impact energy absorbing (IEA) materials for sport helmet pads is conducted. These novel pad materials are fabricated using University of Massachusetts Dartmouth's Flocked Energy Absorbing Material (FEAM). FEAM based IEA panels are prepared by flocking 1 to 3 mm long, 6 to 60 denier textile fibers onto a planar fabric sheet. Flocked fibers are oriented upright to the direction of compressional impact such that energy absorption occurs by the bending, buckling and inter-fiber friction of the upright flock fibers during deformation by impact loading. FEAM pad configurations were tested directly via a double lap shear jig and guided weight drop tower. IEA results of a parametric study are thus reported where the fiber material properties such as flock fiber length, diameter (denier) and flock density (number of flock fibers per area) are presented, discussed, and compared with common vinyl nitrile (VN) foam. Padding material based on FEAM configurations showed remarkable improvement when compared directly to VN foam under pre-compression and dynamic shear loading, with a 135% increase in shear strain energy density for the high impact velocity loading condition, and a 49% increase for low impact velocity condition. The IEA performance of the padding materials, in terms of both linear and angular accelerations, under impact loads were then evaluated using a linear impactor and instrumented NOCSAE head. Impacts from various directions simulate real-time helmet-to-helmet collisions while a high-speed camera is used to record and track neck flexion angles to better understand head kinematics of struck players. The best FEAM padding showed a decrease in resultant angular acceleration of the struck player head of 12.9% , 18% , 9.9%, 14.4%, 17.2%, and 14.4% when struck at 6 m/s at the front, front boss, rear, rear boss cg, rear boss nc, and side locations respectively as compared with VN foam padding.

Dr. Vijaya Chalivendra, Professor of Mechanical Engineering, and Graduate Program Director, UMassD

-Dr. Jun Li, Assistant Professor of Mechanical Engineering, UMassD
-Dr. Caiwei ShenYong Kim, Assistant Chancellor Professor of BioeMechanical Engineering, UMassD

Open to the public. All MNE students are encouraged to attend.

For more information, please contact Dr. Vijaya Chalivendra (, 508-910-6572).
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