Mechanical Engineering MS Thesis Defense by Mr. Christopher Meninno
When: Thursday,
August 12, 2021
11:00 AM
-
1:00 PM
Where: > See description for location
Description: Mechanical Engineering MS Thesis Defense by Mr. Christopher Meninno
DATE:
August 12, 2021
TIME:
11:00 a.m.-1:00 p.m.
LOCATION: ZOOM:
https://umassd.zoom.us/j/99219688676?pwd=Z1E5S1JEVklEa2F2c3ZWR3VGdVU3dz09
Meeting ID: 992 1968 8676
Passcode: 738739
TOPIC:
DAMAGE MONITORING IN HYBRID LAMINATED COMPOSITES
ABSTRACT:
Hybrid laminated composites gained lot of attention in the recent past due to superior performance of the synergetic effect of different fiber materials. With inherent complex structure of hybrid composites, understanding of damage evolution becomes quite challenging. In this thesis, damage monitoring studies were performed on (a) carbon/glass intra-hybrid laminated composites under mode-I and mode-II fracture loading conditions; and (b) jute/flax inter-hybrid woven laminated composites reinforced with micro carbon fibers along the thickness direction under flexure loading conditions. Multi-wall carbon nanotubes were embedded in epoxy matrix to generate three-dimensional conductive network in above composites. In addition to determining the fracture toughness and flexural strength of composites, a four circumferential probe measuring technique is used to measure the piezo-electrical response under mechanical loads and later it was correlated with damage mechanisms observed using scanning electron microscopy images. In the carbon/glass intraply composites, three different laminate orientations (G-0-C-90, C-0-G-90, and G-45-C-45) were tested. Glass fibers were found to have rougher fracture surfaces, which correlates well with the result of the largest GIC value of 308 J/m2 for the C-0-G-90 composites. When the glass fiber was in the direction of crack growth, the G-0-C-90 composite had the largest GIIC value of 541 J/m2. All three types of composites demonstrated different electrical response for mode-I and mode-II fracture loading conditions. As for the jute/flax composites, the addition of carbon fibers reduced flexural strength in most cases, aside from composites of 150 µm carbon fibers and 2000 fibers/mm2 fiber density and composites of 350 µm carbon fibers and 1500 fibers/mm2. Each composite exhibited two zones of electrical response, with zone-1 referring to elastic deformation and zone-2 corresponding to onset and growth of micro-cracks.
ADVISOR:
Dr. Vijaya Chalivendra, Professor of Mechanical Engineering, and Graduate Program Director, UMassD
COMMITTEE MEMBERS:
-Dr. Jun Li, Assistant Professor of Mechanical Engineering, UMassD
-Dr. Caiwei Shen, Assistant Professor of Mechanical Engineering, UMassD
Open to the public. All MNE students are encouraged to attend.
For more information, please contact Dr. Vijaya Chalivendra (vchalivendra@umassd.edu, 508-910-6572).
Thank you,
Sue Cunha, Administrative Assistant
Mechanical Engineering Department
scunha@umassd.edu
DATE:
August 12, 2021
TIME:
11:00 a.m.-1:00 p.m.
LOCATION: ZOOM:
https://umassd.zoom.us/j/99219688676?pwd=Z1E5S1JEVklEa2F2c3ZWR3VGdVU3dz09
Meeting ID: 992 1968 8676
Passcode: 738739
TOPIC:
DAMAGE MONITORING IN HYBRID LAMINATED COMPOSITES
ABSTRACT:
Hybrid laminated composites gained lot of attention in the recent past due to superior performance of the synergetic effect of different fiber materials. With inherent complex structure of hybrid composites, understanding of damage evolution becomes quite challenging. In this thesis, damage monitoring studies were performed on (a) carbon/glass intra-hybrid laminated composites under mode-I and mode-II fracture loading conditions; and (b) jute/flax inter-hybrid woven laminated composites reinforced with micro carbon fibers along the thickness direction under flexure loading conditions. Multi-wall carbon nanotubes were embedded in epoxy matrix to generate three-dimensional conductive network in above composites. In addition to determining the fracture toughness and flexural strength of composites, a four circumferential probe measuring technique is used to measure the piezo-electrical response under mechanical loads and later it was correlated with damage mechanisms observed using scanning electron microscopy images. In the carbon/glass intraply composites, three different laminate orientations (G-0-C-90, C-0-G-90, and G-45-C-45) were tested. Glass fibers were found to have rougher fracture surfaces, which correlates well with the result of the largest GIC value of 308 J/m2 for the C-0-G-90 composites. When the glass fiber was in the direction of crack growth, the G-0-C-90 composite had the largest GIIC value of 541 J/m2. All three types of composites demonstrated different electrical response for mode-I and mode-II fracture loading conditions. As for the jute/flax composites, the addition of carbon fibers reduced flexural strength in most cases, aside from composites of 150 µm carbon fibers and 2000 fibers/mm2 fiber density and composites of 350 µm carbon fibers and 1500 fibers/mm2. Each composite exhibited two zones of electrical response, with zone-1 referring to elastic deformation and zone-2 corresponding to onset and growth of micro-cracks.
ADVISOR:
Dr. Vijaya Chalivendra, Professor of Mechanical Engineering, and Graduate Program Director, UMassD
COMMITTEE MEMBERS:
-Dr. Jun Li, Assistant Professor of Mechanical Engineering, UMassD
-Dr. Caiwei Shen, Assistant Professor of Mechanical Engineering, UMassD
Open to the public. All MNE students are encouraged to attend.
For more information, please contact Dr. Vijaya Chalivendra (vchalivendra@umassd.edu, 508-910-6572).
Thank you,
Sue Cunha, Administrative Assistant
Mechanical Engineering Department
scunha@umassd.edu
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