Stress-adapted fiber orientation along the principal stress directions for continuous fiber-reinforced material extrusion

Abstract A proven method to enhance the mechanical properties of additively manufactured plastic parts is embedding continuous fibers. Due its great flexibility, fiber-reinforced material extrusion allows fiber strands be deposited along optimized paths. Nevertheless, fibers have so far been embedded in contour-based or on basis regular patterns. The outstanding strength and stiffness longitudinal direction cannot optimally utilized. Therefore, a proposed which embed principal stresses into load-oriented manner. G-code generated from calculated stress trajectories part geometry, also takes account specific restrictions manufacturing technology used. distinction made between paths matrix that average volume content can set defined way. To determine properties, tensile flexural tests are carried out specimens consisting carbon polyamide. In order increase influence stress-based orientation, open-hole plates used for tests, as this leads variable across cross section. addition, digital image correlation system deformations during tests. It was found peak load greater by factor 3 1.9 than comparison with unidirectional alignment.