Abstract
The mechanical characteristics of 3D printed polymer materials such as strength and stiffness depends on extruded filaments, which are fundamental building blocks. Currently there is a lack of studies on the effects of length scaling on the strength and reliability of extruded filaments. In this study, single extruded filaments (SEF), multiple extruded filaments without overlap (MEFWNO) and multiple extruded filaments with overlap (MEFWO) of Polylactic acid (PLA) material with different gauge lengths (5, 10 and 15 cm) are tested for axial tensile modulus, ultimate strength, failure strain and toughness. A probabilistic strength prediction model of individual extruded filaments, as well as extruded filaments with and without overlap is developed, wherein the 2-parameter Weibull distribution is used to determine the probability of failure of extruded filaments at various stresses. Reliability curves for tensile stress to failure and tensile strain to failure are developed for SEF, MEFWNO and MEFWO. Higher tensile strength, Young modulus, strain at failure and toughness are demonstrated for MEFWO compared to MEFWNO, enabling quantification of the effect of overlap between two adjacent extruded filaments. This data can further be used for analytical and numerical material constitutive modeling of 3D printed PLA with various deposition orientations and layups in components.
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