@article{article_1624258, title={Effect of ASTM D638 Specimen Type on the Tensile Properties of Fused Deposition Modelling 3D-Printed PLA Specimens}, journal={Erciyes Üniversitesi Fen Bilimleri Enstitüsü Fen Bilimleri Dergisi}, volume={41}, pages={412–431}, year={2025}, author={Gomaa, Roaa and Eltahir, Sara and Yilmaz, Cagatay}, keywords={Eriyik Yığma Modellemesi, Poli Laktik Asit (PLA), Sayısal Görüntü Korelasyonu, Çekme Testi}, abstract={This research examines how different ASTM-D638 specimen types affect the mechanical properties of 3D-printed PLA materials. Specimen types refer to specific configurations of test samples used in mechanical testing, as defined by ASTM-D638 standards, which include five different types: Type I – Type V. This standard outline various specimen geometries and dimensions to ensure consistent and comparable testing procedures for Polylactic acid (PLA) related studies. Computer-aided design (CAD) models are created and Fused Deposition Modeling (FDM) 3D printing is used to produce PLA specimens. Tensile testing and Digital Image Correlation (DIC) analysis are performed to measure the strength and strain of the samples, respectively. The study aims to provide comprehensive data on specimen type’s impact on part properties and demonstrate a cost-effective strain measurement method using DIC and a smartphone. The methodology includes CAD modeling, 3D printing, surface preparation, tensile testing, DIC analysis using Ncorr, and MATLAB data processing. Results show stress-strain curves and average strain values, with Type I and Type II exhibiting the highest ultimate tensile strength (UTS) of 43.179 MPa and 43.164 MPa, respectively. However, Type V is the most optimum option due to its short printing time and low filament usage which are 5 times less than Type I, and a reasonable UTS of 42.640 MPa. This research fills a knowledge gap on specimen design’s influence on 3D-printed part properties, providing valuable insights for future research.}, number={2}, publisher={Erciyes Üniversitesi}