円孔を有するロービングガラスクロスFRP板の降伏について

概要

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It is postulated that yielding of roving glass cloth FRP depends only on the shear stress component τ_<12> in the principal axis of anisotropy and the yield criterion for the material is expressed as τ_<12>=τ_y (constant). By using this criterion the elastoplastic behavior under uniaxial tension of an anisotropic plate with a circular hole has been studied by means of the finite-element method. The results obtained are as follows : (1) In the case of 0 degree tension, the angle θ where the shear stress τ_<12> becomes maximum is about 62〜72 degree. The yielding zone starts at this point and grows to 0 degree direction. The nominal stress level σ_<0y> when the material begins to yield is about 1.23 τ_y in the case of an infinite plate. (2) In the case of 45 degree tension, θ is always 90 degree and the yielding zone grows to 45 degree direction. σ_<0y> is 0.74 τ_y for an infinite plate. (3) The stress concentration factor increases when the yielding zone grows.
社団法人日本材料学会の論文
1978-08-15