圧縮力を受ける波板の最高荷重について : 直交異方性板の塑性挫屈

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In this paper, the authors propose two new formulas for the plastic buckling of plates as well as the plastic buckling of corrugated plates, one of which is called γ-formula (isotropic tangent modulus formula) and another is named Orthogonal Anisotropic Tangent Modulua Formula. The former which gives the lower limit of plastic buckling stress of plates, corresponds to "Shanley load" in case of column instability, and G_t=E_t/2(1+v). Ths latter is obtained from a plane stress problem in which the yielded plate subjected to compressive load is regarded as a orthotropic corrugated plate, and G_t=EE_t/E+(1+2v)Et. These two formulas tabulated in Tabel 1 with other famous formulas, showed a satisfactory agreement with the test results (Fig. 10).The authors also established the general calculating method to obtain the ultimate strength of corrugated plates in plastic range (using γ-formula explained above) as well as in elastic range for design purposes, including the determination of all the rigidities of corrugated plate. Especially, the torsional rigidity D_<xy> was checked by a test which coincided with the calculated value.The behavior of elastic buckling stress (σ) of orthotropic plates is also studied in this paper. Provided D_x, D_y=αD_x, H=βD_x and α=β^2(where α=anisotropic coefficient for bending and β=anisotropic coefficient for torsion), it is shown in Fig. 7 that σ decreases gradually as β decreases from 1 to 0 and the corresponding buckling mode also changes as σ varies.
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圧縮力を受ける波板の最高荷重について : 直交異方性板の塑性挫屈

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