A novel invariant-based approach to describe stiffness and strength of carbon-fiber-reinforced plastic composites has been recently proposed in the literature. In this work, a direct sizing method based on trace of the plane stress stiffness matrix and unit circle failure criterion is proposed. Strength-based profile of a panel is first determined for a baseline material based on the upper-bound value of the calculated failure index k-field from a boundary-value problem. The structural component can then be scaled linearly to meet the stiffness requirements that include deformation, deflection, natural frequency, and buckling. Material selection by scaling is the last step in this sizing method. The proposed approach is conceptually simple to implement, not material specific, and immediately applicable for automated tape laying. Although this is a 2D formulation of an orthotropic homogenized laminate, the 3D stiffness can be separated into two uncoupled in-and out-of-plane submatrices. Thus, the in-plane results of this method are independent of the outof-plane behavior.
Resumen En este trabajo las propiedades viscoelásticas de un polímero fueron determinadas a partir de ensayos cuasi-estáticos y dinámicos, utilizando un equipo de análisis dinámico-mecánico. Se determinó la capacitancia y módulo de relajamiento de muestras de acrilonitrilo butadieno estireno en ensayos de fluencia y de relajamiento de tensión, respectivamente. Ensayos dinámicos con aplicación de excitación armónica fueron también realizados, en un rango de frecuencia definido, y las propiedades medidas fueron utilizadas para calcular la capacitancia y el módulo de relajamiento. La relación entre las propiedades medidas y las calculadas fue evaluada y discutida. Se concluye que existe una buena correlación entre las propiedades medidas y las calculadas.
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