集中的圧縮荷重を受ける発ぽう樹脂心材のサンドイッチ構造床の設計

概要

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The floor of rolling-stocks will be in the most severe condition, when it has to support concentrated compressive load such as the weight of a woman carrying heavy luggage and standing on a high heel. Particularely is it the case with the floor of rigid plastic foam sandwich, the most delicate material with acoustic and thermal insulation effect, but not tough enough against the concentrated compressive load.The formulas given below give the relations between the rigidity of the face plate, the compressive modulus of elasticity of the core and deflection of the face, when the rigid plastic foam sandwich floor supports such concentrated load.w=P/(8πD)(a^2-b^2/2+b^2log_eb/a) (A)E_c=64Dt_c/((a^2-b^2)^2) (B)in whichD=E_F T_<F^3>/(12(1-μ^2))w : deflection of the faceP :concentrated compressive loa da :radius of loaded circular area of the cor eb :radius of bottom surface of a high heel E_c :compressive modulus of elasticity of the core t_c :thickness of the core E_F :flexural modulus of elasticity of the face t_F :thickness of the face μ :Poisson's ratio of the face D :flexural rigidity from (B), we find a^2=b^2+8√<D・t_c/(E_c) (C)From fomulas (A) and (C), we obtain the maximum deflection of sandwich or the deflection of the face w, But w/t_c must be less than the proportional limit strain of the core. The calculated value of deflection w was found to be 1〜1.5 times as high as the experimental value.
1967-02-15