Material Extrusion Additive Manufacturing of Poly(Lactic Acid): Influence of infill orientation angle

The effect that the infill orientation angle has on strain-rate dependence of yield stress for material extrusion additive manufactured (ME-AM) PolyLactic Acid (PLA) was investigated. Symmetric angle-ply stacking sequences were used to produce ME-AM tensile test samples. Measured stresses compensated voided structure, typical components. Furthermore, molecular and stretch macroscopically assessed by a thermal shrinkage procedure. Additionally, hot-press compression molded (CM) samples mechanically characterized in uniaxial order determine material’s isotropic bulk properties. Initial model parameters Ree–Eyring modification Eyring flow rule determined using CM data. According SEM fractography, all showed microscopically brittle fracture behavior. Notwithstanding, contrary samples, specimens ductile stress–strain behavior transition from regime with only primary ?-deformation process, at low strain rates, 2 deformation processes (?+?), high rates. These effects are an influence processing step attributed polymer chains, provoking anisotropic mechanical As consequence, deformation-induced change rate constants is needed adequately describe behavior, leaving initial activation volumes unchanged. Taking this deformation-dependence into account, as function can be appropriately predicted.