RESEARCH ON ENERGY ABSORBING STRUCTURES. PART VIII.
Annual rept. 1 Feb 69-1 Feb 70,
ARA INC WEST COVINA CALIF
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The increase of axial strain with number of cycles of torsional loading is similar to the increase of creep strain with time. The slope of isochronous curves for creep is commonly used to estimate the creep buckling of columns. Consequently, the slope of stress-strain curves at different torsional cycles, called effective modulus, may similarly estimate the buckling of columns subject to cyclic torsional loading. Tests were conducted to obtain the effective modulus of thin-walled tubular specimens of aluminum alloy 2024-T351 with axial tension and cyclic torsion. A method for calculating large deflections of elasto-plastic shells of revolution under axisymmetric loadings is presented. The problem involves two types of non-linearity one is geometrical due to finite strain and the other is due to non-linear stress-strain relations. Author
- Structural Engineering and Building Technology