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Deformation and fracture in a laminated metallic composite system

Osman, Todd Michael
http://rave.ohiolink.edu/etdc/view?acc_num=case1062603827

Abstract Details

1995, Doctor of Philosophy, Case Western Reserve University, Materials Science and Engineering.
Laminated metallic composites are being investigated for fracture toughness improvements. DRA laminates consisting of alternating layers of discontinuously reinforced aluminum (DRA) material and monolithic aluminum are one type of laminated metallic composite which are being developed for aerospace applications. Previous work has shown the viability of a laminated approach for toughness improvement in DRA materials. The focus of the current study is to analyze the deformation and fracture mechanisms which are operative in selected model DRA laminates and the influence of such mechanisms on the damage tolerance of layered structures. In the present work, the development of constrained plastic flow in a ductile metallic ligament of a laminated, bi-material system is investigated. Previous work in the literature has identified deformation of a constrained metallic ligament as an important aspect influencing the toughness of layered structures. Finite element modeling and experimental techniques were employed in this study to analyze the role of property mismatches between the constituent materials as well as ductile metallic ligament thickness on the development of constrained plastic flow in aluminum. Model DRA laminates were then fabricated to analyze factors contributing to the fracture toughness of DRA laminates. In particular, the effect of constituent layer thickness and aluminum alloy properties on the R-curve behavior exhibited by DRA laminates was investigated. The results provide information pertaining to the optimization of DRA laminates with improved specific stiffness-toughness combinations
John Lewandowski (Advisor)
180 p.
Engineering, Materials Science
Metallic composites, laminated; Fracture strength

Recommended Citations

Citations

  • Osman, T. M. (1995). Deformation and fracture in a laminated metallic composite system [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1062603827

    APA Style (7th edition)

  • Osman, Todd. Deformation and fracture in a laminated metallic composite system. 1995. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1062603827.

    MLA Style (8th edition)

  • Osman, Todd. "Deformation and fracture in a laminated metallic composite system." Doctoral dissertation, Case Western Reserve University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1062603827

    Chicago Manual of Style (17th edition)

case1062603827
626
© 1995, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.