リングの圧縮試験による直交異方性平板の弾性定数の測定法について

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In order to describe the elastic constants of the orthotropic plate having the unknown principal direction under a plane stress condition, we have to determine 4 more independent elastic constants in addition to that in the principal direction. If we try to evaluate these values by an ordinary tensile test, we have no alternative but to carry out the tensile tests in the directions other than the principal direction (the tensile tests of off-angle). However, there are always some difficulties in the off-angle tests. The present report describes a method of determining the principal direction and elastic constants of an orthotropic plate by carrying out the compressive tests on the ring specimens cut out from the plate. When an orthotropic ring is compressed in θ direction against its principal direction. the deflectionδ_c of the ring will be approximately described as follows: δ_c=f(E_l, E', E_t, sin^2θ, cos^2θ), 1/(E')= 1/2(1/(G_<lt>)-(2v_<lt>)/(E_l)) Here, E_l, E_t, v_<lt> and G_<lt> are its Young's modulus, Poisson's ratio and shear modulus in the principal direction, respectively. Since the relation ofδ_c-θassumes the center of symmetry atθ=0° and 90°, we can determine the principal direction by finding out the symmetric point of theδ_c-θ' curve obtained by the compressive tests in severalθ' directions against its reference axis. After the principal direction has been determined. compressive tests are carried out in the directions of 0° and 90° on the open ring samples made from the ring by cutting off one part. Then, the values of elastic constants are obtained from the values of δ_c and deflectionδ_h of the open ring by the following procedure.
社団法人日本材料学会の論文
1974-04-15

リングの圧縮試験による直交異方性平板の弾性定数の測定法について

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