一方向繊維強化プラスチックスの力学的挙動

概要

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The linear viscoelastic constitutive equation of the unidirectional fiber reinforced plastics of rectangular array has been theoretically derived for the plane stress state. By applying the correspondence principle, the constitutive equation was obtained by the inverse Laplace transformation of the constitutive equation for elastic body in which elastic fibers were embeded. The linear viscoelastic failure criterion was also determined on the basis of the following two considerations, (1) the proportional limit stress for fiber, and (2) the stress causing the debonding between fiber and matrix. Experimental works of creep tests, stress relaxation tests, constant load rate tensile tests and constant strain rate tensile tests were conducted by using copper fiber-epoxy resin composite having various fiber volume fractions and fiber directions. A good agreement between the results calculated by the constitutive equation and the experimental results was observed in the low stress region where the linear viscoelastic behavior predominates. The experimental results of linear viscoelastic failure criterion show an analogous tendency to the calculated ones.
社団法人日本材料学会の論文
1973-09-15