Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


akron1185585157.pdf (1.04 MB)

ETD Abstract Container

Abstract Header

Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces

Hamey, Cole S.
http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157

Abstract Details

2007, Doctor of Philosophy, University of Akron, Civil Engineering.
In this study, mechanics models for bi-layer beams suitable for bi-material interface characterization are introduced, and their application to mixed mode fracture of wood-FRP bonded interface is studied. First, an engineering approach for evaluating the mixed-mode (Mode-I/II) fracture toughness of wood/FRP composite bonded interfaces is presented. Two four-point bending specimens, i.e., four-point asymmetric end-notched flexure (4-AENF) and four-point asymmetric mixed-mode bending (4-AMMB), are proposed for the study of the mixed-mode fracture. With proper design, the rate of compliance change with respect to crack length can be determined to be independent of the crack length for the specimens. The proposed specimens can be used to determine the mixed-mode fracture toughness without the need of measuring the crack propagation length. Mode decompositions are evaluated for each specimen, and with previously determined Mode-I and Mode-II data, a number of failure criteria and failure envelopes are determined for the wood-FRP interface. Second, an intuitive mechanics-based approach is presented to analyze layered beams using the split beam model, from which the layered beam is modeled as individual sub-beams and the stress acting throughout each sub-beam is used to determine the forces acting on the sub-beams. The split beam model is adapted to evaluate the compliance and ERR of three common groups of fracture specimens and loading conditions: Mode-I dominant (ADCB and DCB), Mode-II dominant (AENF and ENF), and Mixed-Mode (ASLB and SLB). It is demonstrated that the split beam model generates solutions consistent with those of existing specimens found in literature. Also, derived specimens are provided to allow for different ways of viewing the specimen configurations and possible ways of applying loads to achieve certain conditions. The compliance and ERR of two derived specimens are presented. The ERR for these two specimens is shown to be the same as the existing solutions, thus validating the accuracy of the approach. The simplified bi-layer models and related application to fracture of bi-material interface introduced in this study improve the data reduction techniques in fracture characterization and facilitate analysis and design of bi-material fracture specimens.
Wieslaw Binienda (Advisor)
Pizhong Qiao (Advisor)
110 p.
Engineering, Civil
Fracture Mechanics; LEFM; Interface Mechanics

Recommended Citations

Citations

  • Hamey, C. S. (2007). Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157

    APA Style (7th edition)

  • Hamey, Cole. Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces. 2007. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157.

    MLA Style (8th edition)

  • Hamey, Cole. "Mechanics of Bi-Material Beams and Its Application to Mixed-mode Fracture of Wood-FRP Bonded Interfaces." Doctoral dissertation, University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1185585157

    Chicago Manual of Style (17th edition)

akron1185585157
3,564
© 2007, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.