Mechanical Performance Assessment of Internally-Defected Materials Manufactured Using Additive Manufacturing Technology

Abstract

Assessment of the mechanical performance of internally-defected components or struc-tures is of crucial importance to many industrial fields such as aerospace, automobile, marine, construction etc. Most of the studies available in the literature include only analytical or numerical solutions, due to difficulty in the manufacturing of a testing sample with a specific internal defect geometry for experimental evaluations. In this study, Fusion Deposition Modeling (FDM) was utilized in the 3D-printing of Polylactic Acid (PLA) samples with internal cracks, aiming to assess their impact on the samples’ mechanical performance. The defect geometry, orientation, location along the sample gauge length and the influence of the process parameters, such as the infill percentage and the material color, were investigated. The influence of the internal defects is more pronounced for a 100% infill rate if compared with a 50% infill rate as a consequence of the porosity. A maximum drop of ~14% in the peak load of defect-free samples was recorded due to the presence of the internal defect. Moreover, the additive color to the PLA material might contribute to the material strength. Generally, the findings of this work could open another door for utilizing the additive manufacturing in many research areas, with potential industrial applications relevant to the assessment of internally-defected materials.

Investigation of mechanical properties and biodegradability of compatibilized thermoplastic starch/ high impact polystyrene blends reinforced by organophilic montmorillonite

“…The samples were prepared by compression according to the ASTM standard D 638. 17–21 The gauge length (G), parallel length (L) and full length (L 0 ) were 50, 57 and 165 mm, respectively. The width at grip section (W 0 ), parallel section (W c ) and thickness (e) are 13, 19 and 7 mm, respectively.…”

Optimization of the Internal Structure of 3d-printed Components for Architectural Restoration

“…Despite the similar overall force-displacement response of the samples, it is noticeable from the plots that one of the samples exhibits lower strength and stiffness values, along with greater ductility. This divergent behavior of the sample may be attributed to potential and inevitable misalignments during the test and, moreover, to geometric imperfections arising during the printing process [22,23].…”

Design of an Atypical Construction of Equipment for Additive Manufacturing with a Conceptual Solution of a Printhead Intended for the Use of Recycled Plastic Materials

“…As part of a partial solution, we initially considered a simple alternative to the Tripteron-type construction, which forms a kind of basis for atypical devices with untapped potential. From our perspective, this could be used in the printing of non-planar surfaces [24].…”