Experimentally Observed Bifurcation Diagrams
Extensive studies of structures and materials undergoing perfect and imperfect bifurcation have been conducted. Bifurcation of structures can be highlighted, e.g., by Ziegler, 1968, 1977 ; Thompson and Hunt, 1973, 1984 , ; Ben-Haim and Elishakoff, 1990 ; Bažant and Cedolin, 1991 ; and references therein. For bifurcation of materials, refer, e.g., to Hill and Hutchinson, 1975  and Vardoulakis and Sulem, 1992 .
KeywordsBifurcation Diagram Bifurcation Point Volumetric Strain Equilibrium Path Initial Imperfection
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