形状記憶合金で作られた柱の座屈現象について : 第2報,直柱の座屈と座屈抑制効果

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The buckling characteristics of straight SMA (shape memory alloy) columns were investigated in this study. A parameter called anti-buckling capability was introduced and used to judge the stability of SMA columns under axial compression. The anti-buckling capability of SMA columns with different lengths and axial loads were calculated using a simple method. It was found for all considered lengths of columns that with the increase of axial load the anti-buckling capability decreases to a minimum value first, increases again to a maximum value and at last decreases monotonically to negative. This special anti-buckling capability versus axial load curve of SMA columns is due to the special non-linearity of stress-strain curve of the SMA. The anti-buckling capability at the minimum point can be either positive or negative depending on the length of a column. Since a SMA column buckles at the smallest value of the axial load, at which the antibuckling capability becomes negative, the sign of the anti-buckling capability at the minimum point of the anti-buckling capability versus axial load curve is critical to the buckling load of column. If the anti-buckling capability at the minimum point is negative, the column buckles at a significantly low axial load. However, the absolute value of the negative anti-buckling capability is relatively small and it can easily be changed to positive by very simple strengthening so that tthe buckling load of the column can be significantly increased.
社団法人日本機械学会の論文
2002-11-25

形状記憶合金で作られた柱の座屈現象について : 第2報,直柱の座屈と座屈抑制効果

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