Tensile fracture analysis of FDM printed polylactic acid notched plate: influence of grating arrangement configuration

Research Overview: A study published in Polymer Testing Volume 164 (November 2026) by A.R. Torabi, Soroush Sadeghi, Babak Salehi, and M.R. Ayatollahi titled “Tensile fracture analysis of FDM intended polylactic acid notched plates using simplified material concepts: Effects of raster configuration”. The study focuses on polylactic acid (PLA) notched plates printed by fused deposition modeling (FDM), and uses simplified material concepts to conduct tensile fracture analysis. The influence of grating configuration on fracture behavior is also investigated.

Focus: Printing Path and Fracture Response

FDM process is formed by layer by layer extrusion and path stacking. The direction and arrangement of the printing path will change the interface distribution and local orientation inside the material, thereby affecting the tensile fracture response of the notched part.

. This study analyzed the grating configuration as a variable, combined with notch specimens and simplified material concepts, providing experimental and theoretical references for understanding the relationship between printing parameters and fracture performance. The source abstract does not provide specific process parameters such as grating angle, layer thickness, printing temperature, nor does it disclose fracture toughness or strength values. The relevant quantitative conclusions should be based on the full text of the paper.

Significance for polymer aging and stabilization

PLA is a biobased polyester that is sensitive to hydrolysis and thermal oxidation, and its printed parts also face polymer aging problems during long-term service.

. The interlayer and filament interface formed by the printing path is often the preferred channel for stress concentration and medium penetration, which accelerates the initiation and propagation of local degradation. Therefore, when evaluating the durability of FDM components, the fracture analysis results need to be viewed in conjunction with the performance changes after aging: an increase in notch sensitivity usually means a decrease in the material’s ability to resist crack propagation after aging. From the perspective of formula design, this type of fracture research suggests that stabilization schemes should not only focus on the bulk resin. For printing consumables, the antioxidant system needs to suppress thermal oxidative degradation during the two thermal histories of extrusion drawing and printing molding, reducing the brittleness caused by molecular weight loss; In terms of weather resistance and stability, the composite system of HALS and UVA can be used to suppress photooxidation in outdoor use. UVA is responsible for shielding ultraviolet radiation, while HALS intervenes in the photooxidation chain reaction. The combination of the two is usually more effective in balancing surface and internal protection than a single component. For printed parts with a high proportion of interlayer interfaces, the migration and distribution of stabilizing agents can also affect the protective effect of the interface area, which requires the design of the composite system to consider both processing stability and long-term weather resistance.

Connection between detection and characterization

The notch tensile and fracture analysis approach adopted in this study can be combined with mechanical testing, molecular weight, and carbonyl index characterization methods before and after aging to form an evaluation chain from degradation mechanism to component performance.

. For the development of additives, incorporating printing configurations into experimental design can help distinguish between intrinsic brittleness of materials and the decrease in fracture performance caused by structural factors, avoiding misjudging process effects as stable system failure.

Explanation: The source only provides information on the title, journal issue, author, and research direction, and does not include specific experimental data and conclusions. This article does not make any inferences about its numerical results.

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Information source:Tensile fracture analysis of FDM-printed polylactic acid notched plates using simplified material concepts: Effects of raster configuration， Organized by Herun Chemical.