D.H. Pahr¹ and S.M. Arnold²
¹Institute of Lightweight Structures and Aerospace
TU Wien, Vienna, Austria
²NASA Glenn Research Center, Cleveland, OH
The paper begins with a short overview of the recent work done in the field of
discontinuous reinforced composites, focusing on the different parameters which
influence the material behavior of discontinuous reinforced composites, as well
as the various analysis approaches undertaken.
Based on this overview it became evident, that in order to investigate the
enumerated effects in an efficient and comprehensive manner, an alternative
approach to the computationally intensive finite-element based micro-mechanics
approach is required.
Therefore an investigation is conducted to demonstrate the utility of utilizing
the generalized method of cells (GMC), a semi-analytical micromechanics-based
approach, to simulate the elastic and elastoplastic material behavior of
aligned short fiber composites.
The results are compared with 1) simulations using other micromechanical based
mean field models and finite element (FE) unit cell models found in the
literature given elastic material behavior, as well as 2) finite element unit
cell and a new semi-analytical elastoplastic shear lag model in the inelastic
GMC is shown to definitely have a window of applicability when simulating
discontinuously reinforced composite material behavior.