TEXTURE AND ANISOTROPIC MATERIAL PROPERTIES OF LIQUID CRYSTAL POLYMERS

摘要

Liquid crystal polymers (LCP) exhibit strongly anisotropic mechanical properties due to self-reinforcement resulting from the injection-moulding process. A superposition of the effects of shear flow and elongational flow leads to the development of a graded layer structure. For an optimal exploitation of the mechanical and hygro-thermal properties of this material group (especially for components with complex geometry), the determination of the local texture is basically important, because it largely determines the anisotropy and therefore the macro-mechanical properties. Within this paper, the fundamental will be layed for an LCP-specific concept including problems of texture, local anisotropy, micro- and macro-mechanical material properties up to component optimization and adapted anisotropic failure hypotheses. For this purpose, disturbed areas in the material structure due to the moulding process such as different holes and weld lines, which significantly influence the local texture, are examined dependent on several influencing factors.