Influence of infill pattern and layer height on surface characteristics and fatigue behavior of FFF-printed PEEK

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-09-24 DOI:10.1111/ffe.14450

Alessandro Greco, Alessandro De Luca, Salvatore Gerbino, Giuseppe Lamanna, Raffaele Sepe

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Abstract

PolyEther Ether Ketone (PEEK) is a leading thermoplastic biomaterial renowned for its exceptional overall properties and suitability for processing via Fused Filament Fabrication (FFF) Additive Manufacturing (AM). Despite its widespread use in industries, its fatigue behavior remains a critically underexplored aspect. This study aims to investigate the fatigue behavior of FFF-produced PEEK, considering variations in infill pattern (triangular or rectilinear) and layer height (0.15 mm or 0.25 mm). Fatigue tests revealed a significant influence of the infill pattern on fatigue behavior, with the rectilinear pattern outperforming the triangular one. Layer height had a negligible effect when paired with rectilinear infill. Specimens with rectilinear patterns exhibited superior fatigue performance, achieving infinite fatigue life at maximum applied stress around 70% of ultimate tensile stress. Surface roughness assessment and fracture surface analysis at scanning electron microscope enhanced the interpretation of the results. This pioneering study lays the groundwork for future research in design for AM.

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填充图案和层高对 FFF 印刷 PEEK 表面特性和疲劳行为的影响

聚醚醚酮（PEEK）是一种领先的热塑性生物材料，因其优异的综合性能和适合通过熔融长丝制造（FFF）增材制造（AM）工艺加工而闻名于世。尽管它在工业中得到了广泛应用，但其疲劳行为仍是一个探索严重不足的方面。本研究旨在考虑填充模式（三角形或直线形）和层高（0.15 毫米或 0.25 毫米）的变化，研究 FFF 生产的 PEEK 的疲劳行为。疲劳测试表明，填充图案对疲劳行为有显著影响，直线图案优于三角形图案。层高与矩形填充物搭配时，其影响可以忽略不计。矩形图案的试样具有更优越的疲劳性能，在最大外加应力约为极限拉伸应力的 70% 时可达到无限疲劳寿命。扫描电子显微镜下的表面粗糙度评估和断裂面分析增强了对结果的解读。这项开创性的研究为未来的 AM 设计研究奠定了基础。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.