Effects of microstructural inclusions on fatigue life of polyether ether ketone (PEEK)

Simsiriwong, Jutima; Shrestha, Rakish; Shamsaei, Nima; Lugo, Marcos; Moser, Robert D.

doi:10.1016/j.jmbbm.2015.07.020

Cited by 40 publications

(11 citation statements)

References 11 publications

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“…The used MSF model was first developed by McDowell et al (McDowell et al , 2003) for cast A356-T6 aluminum alloy. This particular model has been successfully applied to a number of other materials, including A356-T6 Al alloy (McDowell et al , 2003; Xue et al , 2007), A380-F Al alloy (Xue et al , 2007), polymers (Lugo et al , 2014; Simsiriwong et al , 2015) and LENS AISI 316L stainless steel (Xue et al , 2010). The model spans both high cycle fatigue (HCF) and low cycle fatigue (LCF), and provides separate equations for multiple stages of fatigue failure.…”

Section: Fatigue Model Calibrationmentioning

confidence: 99%

Utilization of a microstructure sensitive fatigue model for additively manufactured Ti-6Al-4V

Torries

Sterling

Shamsaei

et al. 2016

RPJ

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Purpose The purpose of this study is to calibrate a microstructure-based fatigue model for its use in predicting fatigue life of additively manufactured (AM) Ti-6Al-4V. Fatigue models that are capable of better predicting the fatigue behavior of AM metals is required to further the adoption of such metals by various industries. The trustworthiness of AM metallic material is not well characterized, and fatigue models that consider unique microstructure and porosity inherent to AM parts are needed. Design/methodology/approach Various Ti-6Al-4V samples were additively manufactured using Laser Engineered Net Shaping (LENS), a direct laser deposition method. The porosity within the LENS samples, as well as their subsequent heat treatment, was varied to determine the effects of microstructure and defects on fatigue life. The as-built and heat-treated LENS samples, together with wrought Ti-6Al-4V samples, underwent fatigue testing and microstructure and fractographic inspection. The collected microstructure/defect statistics were used for calibrating a microstructure-sensitive fatigue model. Findings Fatigue lives of the LENS Ti-6Al-4V samples were found to be consistently less than those of the wrought Ti-6Al-4V samples, and this is attributed to the presence of pores/defects within the LENS material. Results further indicate that LENS Ti-6Al-4V fatigue lives, as predicted by the used microstructure-sensitive fatigue model, are in close agreement with experimental results. The used model could predict upper and lower prediction bounds based on defect statistics. All the fatigue data were found to be within the bounds predicted by the microstructure-sensitive fatigue model. Research limitations/implications To further test the utility of microstructure-sensitive fatigue models for predicting fatigue life of AM samples, future studies on additional material types, additive manufacturing processes and heat treatments should be conducted. Originality/value This study shows the utility of a microstructure-sensitive fatigue model for use in predicting the fatigue life of LENS Ti-6Al-4V with various levels of porosity and while in a heat-treated condition.

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Section: Fatigue Model Calibrationmentioning

confidence: 99%

Utilization of a microstructure sensitive fatigue model for additively manufactured Ti-6Al-4V

Torries

Sterling

Shamsaei

et al. 2016

RPJ

Self Cite

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“…Studies of the behavior of PEEK under cyclic loading have concluded that during fatigue tests, PEEK can become stiffer with less damping due to its increasing inability to relax residual stresses from macromolecular slipping and disentanglement and also that PEEK samples with larger inclusions (impurities, defects) have shorter fatigue life. It has also been concluded that in the presence of notches the majority of the energy of the total cyclic lifetime of PEEK is spent on crack initiation and not crack propagation . That is, PEEK fatigue life is mostly dependent of the mechanisms of crack initiation.…”

Section: Resultsmentioning

confidence: 99%

Improvement of the short‐ and long‐term mechanical properties of injection‐molded poly(etheretherketone) and hydroxyapatite nanocomposites

Marcomini

Rego

Bretas

2016

J of Applied Polymer Sci

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Nanocomposites of polyetheretherketone (PEEK) and hydroxyapatite (HA) nanoparticles treated with a silane coupling agent were successfully prepared by twin screw extrusion and injection molding. Some of the samples were annealed after the injection molding. The silane treatment promoted an improvement of the short-and long-term mechanical properties of the nanocomposites. A higher stress and a six times higher deformation at break and a higher impact strength were observed in the silane-treated nanocomposites when compared to the nontreated ones. The number of cycles to fail of the treated nanocomposites was almost 200% higher than the number of cycles to fail of the nontreated samples. The treatment also decreased the glass transition temperature and amount of crystallinity of the samples. This improvement in mechanical properties obtained from the silane treatment was attributed to the strengthening of the PEEK/HA interfacial bond, to the plasticization of the PEEK matrix by silane oligomers produced during the processing and to a better dispersion of the HA nanoparticles within the PEEK matrix. Samples annealing, however, diminished all these properties due to the increase in crystallinity. Studies of the short-and long-term mechanical properties of these nanocomposites under physiological conditions and of the proliferation of stem cells are under way. V C 2016 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2017, 134, 44476.

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“…Poly-ether-ether-ketone (PEEK), owing to its special properties, has become a polymer that has been utilized within many industries, including the medical industry [ 15 ]. This semi-crystalline thermoplastic, belonging to the poly-ether-ether-ketone family, is characterized by a unique combination of high mechanical properties and resistance to chemicals [ 16 , 17 , 18 ]. An additional advantage of PEEK is the lack of cytotoxicity towards normal cells of the human body.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, Chemical, and Processing Properties of Specimens Manufactured from Poly-Ether-Ether-Ketone (PEEK) Using 3D Printing

et al. 2021

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As part of the experiments herein, the mechanical properties of specimens made of poly-ether-ether-ketone (PEEK) material using 3D printing technology were determined. Two populations of specimens were investigated, the first of which contained an amorphous structure, while the other held a crystal structure. The studies also investigated the influence of the print directionality on the mechanical properties obtained. Static tensile, three-point bending, and impact tests were carried out. The results for the effect of the structure type on the tensile properties showed that the modulus of elasticity was approximately 20% higher for the crystal than for the amorphous PEEK form. The Poisson’s ratios were similar, but the ratio was slightly higher for the amorphous samples than the crystalline ones. Furthermore, the studies included a chemical PEEK modification to increase the hydrophilicity. For this purpose, nitrite and hydroxyl groups were introduced into the chain by chemical reactions. The results demonstrate that the modified PEEK specimens had worse thermoplastic properties than the unmodified specimens.

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Effects of microstructural inclusions on fatigue life of polyether ether ketone (PEEK)

Cited by 40 publications

References 11 publications

Utilization of a microstructure sensitive fatigue model for additively manufactured Ti-6Al-4V

Utilization of a microstructure sensitive fatigue model for additively manufactured Ti-6Al-4V

Improvement of the short‐ and long‐term mechanical properties of injection‐molded poly(etheretherketone) and hydroxyapatite nanocomposites

Mechanical, Chemical, and Processing Properties of Specimens Manufactured from Poly-Ether-Ether-Ketone (PEEK) Using 3D Printing

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