Micro-CT analysis and mechanical properties of low dimensional CFR-PEEK specimens additively manufactured by material extrusion

IF 3.3 2区医学 Q2 ENGINEERING, BIOMEDICAL Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2023-10-01 DOI:10.1016/j.jmbbm.2023.106085

Yiqiao Wang , Alexander Ulbricht , Franziska Schmidt , Bernd R. Müller , Andreas Kupsch , Andreas Dominik Schwitalla

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Abstract

Material extrusion of thermoplastic polymers enables the realization of complex specific designs with high performance composites. The present study aims at evaluating the mechanical properties of carbon fiber-reinforced semi-crystalline thermoplastic polymer polyether ether ketone (CFR-PEEK) manufactured by material extrusion and correlating them with results obtained by micro-CT. Samples in the shape of small bars were provided by Kumovis (Munich, Germany). The determination of surface roughness and density was followed by three-point bending tests. To reveal the pore distribution as well as the fusion quality of CFR PEEK when applied with external forces, micro-CT scans were performed with an X-ray microscope before and after the mechanical test to localize the sites where the fracture is generated. The density of CFR-PEEK bars indicated that they had superior mechanical properties compared with our previous study on unfilled 3D printed PEEK (bending modulus: (5.4 ± 0.5) GPa vs. (1.05 ± 0.05) GPa to (1.48 ± 0.10) GPa; bending strength: (167 ± 11) MPa vs. (51 ± 15) to (193 ± 7) MPa). Micro-CT analyses revealed the local 3D-distribution of voids. Voids of 30 μm diameter are nearly spherical and make up the main part of the total porosity. The larger the voids, the more they deviate from a spherical shape. Significant lack-of-fusion voids are located between the deposited filaments. By growing and merging, they act as seeds for the forming fracture line in the region of the flexural specimens where the maximum local tensile stresses occurred under bending load. Our work provides a detailed analysis of printed PEEK with fiber additive and relates this with mechanical properties.

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通过材料挤出添加制造的低维CFR-PEEK试样的显微CT分析和力学性能。

热塑性聚合物的材料挤出使高性能复合材料能够实现复杂的特定设计。本研究旨在评估通过材料挤出制备的碳纤维增强半结晶热塑性聚合物聚醚醚酮（CFR-PEEK）的力学性能，并将其与显微CT结果相关联。Kumovis（德国慕尼黑）提供了小棒形状的样品。表面粗糙度和密度的测定之后进行三点弯曲试验。为了揭示CFR-PEEK在外力作用下的孔隙分布和融合质量，在机械测试前后用X射线显微镜进行了显微CT扫描，以定位产生骨折的部位。CFR-PEEK棒的密度表明，与我们之前对未填充3D打印PEEK的研究相比，它们具有优异的机械性能（弯曲模量：（5.4±0.5）GPa与（1.05±0.05）GPa至（1.48±0.10）GPa；弯曲强度：（167±11）MPa与（51±15）至（193±7）MPa）。显微CT分析显示了空洞的局部三维分布。直径为30μm的孔隙几乎是球形的，并构成总孔隙度的主要部分。空隙越大，它们偏离球形的程度就越大。在沉积的细丝之间存在明显缺乏熔合的空隙。通过生长和融合，它们充当弯曲试样区域中形成断裂线的种子，在弯曲载荷下，最大局部拉伸应力发生在该区域。我们的工作对含有纤维添加剂的印刷PEEK进行了详细分析，并将其与机械性能联系起来。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.