Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List

Full text release has been delayed at the author's request until August 15, 2024

ETD Abstract Container

Abstract Header

Mechanical behavior of tubular composite structures

Zhang, Chao
http://rave.ohiolink.edu/etdc/view?acc_num=akron1627489300935781

Abstract Details

2021, Doctor of Philosophy, University of Akron, Mechanical Engineering.
In this dissertation, we first investigate the dynamic impact response of tubular composite structures with/without honeycomb sandwich core under transverse low- velocity impact (LVI) and compression after impact (CAI) test. Damage mechanisms, such as matrix cracking, delamination and fiber breakage/rupture in face sheets as well as honeycomb crushing and buckling in the core, are characterized by X-ray micro-computed tomography (µCT) to understand failure processes and their relationship with core material and impactor shape. It is found that sandwich core material helps to absorb impact energy and resist localized damage formation. The benefit of core material includes greater energy absorption capability and higher specific CAI strength. The progressive damage events from damage initiation, failure propagation to final collapse of a tubular composite structure during CAI test are also further discussed. Second, we establish a finite element analysis (FEA) model of LVI of composite sandwich structures. The numerical model is validated by comparing with the experimental results in impact response and major failure modes. Results show that energy absorption and impact damages are less for sandwich structure with thinner top face sheet, while the energy absorption percentage of core material is smaller. Results also show that the increment of core thickness can decrease energy absorption efficiency for asymmetric sandwich structures. iv It is also critical to understand buckling and post-buckling behavior of tubular structures which can essentially be affected by the component geometry such as length, diameter and wall thickness. We use both experimental and numerical method to study aluminum and multilayer carbon fiber reinforced plastic (CFRP) tubes under compressive loading, with the aim to extend the knowledge towards extremely large tubular structures. A pin-ended fixture is designed to examine the influence of different support conditions. Experimental results of aluminum tubes show global failure in which critical forces are validated by the Johnson-Euler buckling theory. Results also demonstrate that the critical force of a long tube can be the same as a short tube with different ending conditions.
Kwek-Tze Tan, (Advisor)
Gregory Morscher, (Committee Member)
Yalin Dong, (Committee Member)
Qixin Zhou, (Committee Member)
J. Patrick Wilber, (Committee Member)
132 p.
Mechanical Engineering
Non-destructive testing; Tubular sandwich composites; Finite element analysis; Nonlinear analysis; Low-velocity impact;

Recommended Citations

Citations

  • Zhang, C. (2021). Mechanical behavior of tubular composite structures [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1627489300935781

    APA Style (7th edition)

  • Zhang, Chao. Mechanical behavior of tubular composite structures. 2021. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1627489300935781.

    MLA Style (8th edition)

  • Zhang, Chao. "Mechanical behavior of tubular composite structures." Doctoral dissertation, University of Akron, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1627489300935781

    Chicago Manual of Style (17th edition)

akron1627489300935781
© 2021, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.