Research on Energy Absorbing Structures. Part 11
Annual rept. 1 Feb 1972-1 Feb 1973
ARA INC WEST COVINA CA
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A numerical method for analyzing large deflections of shells of revolution under axisymmetric loading with arbitrary creep characteristics is given. Creep strain is treated as an equivalent external loading. Two nonlinear differential equations similar to Reissners equations are presented and solved by the iterative scheme and the finite difference approximation. The multiaxial stress-strain-time relationship is formulated from the empirical uniaxial curve based on the second deviated stress and strain invariants. Examples are given for a corrugated tube subject to an axial load at an elevated temperature. The results show the nonlinear effects due to finite strain and creep strain. The method shown may also be applied to axisymmetric shells subject to thermal and plastic strains.
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