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Alessa dissertation Final Draft final format fixed -approved LW 8-27-14.pdf (7.19 MB)
ETD Abstract Container
Abstract Header
Delamination in Hybrid Carbon/Glass Fiber Composites
Author Info
Alessa, Hassan Ali
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1399037290
Abstract Details
Year and Degree
2014, Doctor of Philosophy (Ph.D.), University of Dayton, Mechanical Engineering.
Abstract
Fiber reinforced composite materials have been used increasingly in primary and secondary structures in such applications as aircraft, satellites, automobiles, biomedical industries, marine, and sporting goods. This growth is due primarily to the characteristics of composite materials, which include high specific stiffness, high specific strength, and low density. Both carbon and glass fibers are often used as reinforcing fibers, embedded in polymer matrix material. The glass fibers are inexpensive, have high strength to weight ratio, but low stiffness. Carbon fiber is more expensive, but have a high strength to weight ratio and high stiffness. The delamination between composite layers is one of primary weaknesses in composite material structure. The mode I peeling, mode II shearing, and mixed-mode I/II are the most common delamination fracture crack driving modes between interfaces. Delamination can then lead to a reduction in the structural stiffness. If the structure has compression loading, buckling failure may ensue. The best design approach may find a compromise between less weight and less cost by using a hybrid material approach of both glass and carbon fibers. This research focused on a hybrid materials consisting of both glass and carbon fiber embedded in a polymer matrix, undergoing mode I, mode II, and mix mode I/II static interlaminar fracture. Glass fiber panels, carbon fiber panels, and hybrid panels were fabricated using the wet layup / vacuum bag technique. The non-hybrid all-glass, all-carbon, and hybrid glass/carbon were experimentally characterized by quasi-static testing in load frames. The specimen and material geometries (especially at material interfaces) were analyzed using the finite element method. The program Abaqus was utilized, including the cohesive zone method (CZM). Finally, the resulting fracture surfaces were investigated using a scanning electron microscope. The result showed the fracture toughness values of hybrid material (FG/CF) were between that of fiber glass and carbon fiber. Also, fracture toughness increased due to fiber bridging under static mode I, mode II, and mixed mode I/II . Fractographic imaging aided to study mechanical properties interface of hybrid (FG/CF) and comber with non-hybrid material of fiber glass and carbon fiber to investigate the differences between hybrid and non-hybrid.
Committee
Steven Donaldson, Associate Professor (Committee Chair)
James Whitney, Professor (Committee Member)
Muhammad Islam, Professor (Committee Member)
Thomas Whitney, Assistant Professor (Committee Member)
Pages
204 p.
Subject Headings
Mechanical Engineering
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Citations
Alessa, H. A. (2014).
Delamination in Hybrid Carbon/Glass Fiber Composites
[Doctoral dissertation, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1399037290
APA Style (7th edition)
Alessa, Hassan.
Delamination in Hybrid Carbon/Glass Fiber Composites .
2014. University of Dayton, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1399037290.
MLA Style (8th edition)
Alessa, Hassan. "Delamination in Hybrid Carbon/Glass Fiber Composites ." Doctoral dissertation, University of Dayton, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1399037290
Chicago Manual of Style (17th edition)
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Document number:
dayton1399037290
Download Count:
2,388
Copyright Info
© 2014, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.