Fatigue Life Prediction of Biomedical Titanium Alloys under Tensile/Torsional Stress

Kobayashi, Equo; Mochizuki, Hiroto; Doi, Hisashi; Yoneyama, Takayuki; Hanawa, Takao

doi:10.2320/matertrans.47.1826

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Table 1 shows the material properties used in this study. These values have been proportioned by Proclinic and obtained from ASM and Kobayashi et al [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

Dental Implants Fatigue as a Possible Failure of Implantologic Treatment: The Importance of Randomness in Fatigue Behaviour

Prados-Privado

Prados-Frutos

Manchón

et al. 2015

BioMed Research International

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Objective. To show how random variables concern fatigue behaviour by a probabilistic finite element method. Methods. Uncertainties on material properties due to the existence of defects that cause material elastic constant are not the same in the whole dental implant the dimensions of the structural element and load history have a decisive influence on the fatigue process and therefore on the life of a dental implant. In order to measure these uncertainties, we used a method based on Markoff chains, Bogdanoff and Kozin cumulative damage model, and probabilistic finite elements method. Results. The results have been obtained by conventional and probabilistic methods. Mathematical models obtained the same result regarding fatigue life; however, the probabilistic model obtained a greater mean life but with more information because of the cumulative probability function. Conclusions. The present paper introduces an improved procedure to study fatigue behaviour in order to know statistics of the fatigue life (mean and variance) and its probability of failure (fatigue life versus probability of failure).

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“…Table 1 shows the material properties used in this study. These values have been proportioned by Proclinic and obtained from ASM and Kobayashi et al [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

Dental Implants Fatigue as a Possible Failure of Implantologic Treatment: The Importance of Randomness in Fatigue Behaviour

Prados-Privado

Prados-Frutos

Manchón

et al. 2015

BioMed Research International

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“…These alloys consist of partially or completely non-toxic elements such as niobium (Nb), zirconium (Zr), molybdenum (Mo), tantalum (Ta), and tungsten (Wo) [25,26]. Owing to their superior corrosion resistance, high mechanical properties, and higher biocompatibility in comparison with commonly used Ti-6Al-4V, in particular, Ti-6Al-7Nb alloys' designed purpose was to be used in load-bearing implants [26][27][28]. Ti-6Al-7Nb belongs to α + β titanium alloys; in it, Al and Nb stabilize the hexagonal close-packed α phase as well as the body-centered cubic β phase and maintain an equilibrium α + β dual phase at ambient temperature [29].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion

Milaege,

Eschemann,

Hoyer

et al. 2024

Crystals

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Through tailoring the geometry and design of biomaterials, additive manufacturing is revolutionizing the production of metallic patient-specific implants, e.g., the Ti-6Al-7Nb alloy. Unfortunately, studies investigating this alloy showed that additively produced samples exhibit anisotropic microstructures. This anisotropy compromises the mechanical properties and complicates the loading state in the implant. Moreover, the minimum requirements as specified per designated standards such as ISO 5832-11 are not met. The remedy to this problem is performing a conventional heat treatment. As this route requires energy, infrastructure, labor, and expertise, which in turn mean time and money, many of the additive manufacturing benefits are negated. Thus, the goal of this work was to achieve better isotropy by applying only adapted additive manufacturing process parameters, specifically focusing on the build orientations. In this work, samples orientated in 90°, 45°, and 0° directions relative to the building platform were manufactured and tested. These tests included mechanical (tensile and fatigue tests) as well as microstructural analyses (SEM and EBSD). Subsequently, the results of these tests such as fractography were correlated with the acquired mechanical properties. These showed that 90°-aligned samples performed best under fatigue load and that all requirements specified by the standard regarding monotonic load were met.

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“…Titanium alloys are the most widely used metallic materials for load-bearing biomedical applications [5][6][7][8][9]. Ti-6Al-7Nb is an (α + β) titanium alloy with high specific strength and corrosion resistance, accompanied by excellent biocompatibility, and is used as an orthopedic and dental alloy [10][11][12]. Ti-6Al-4V, which already is of high interest in the biomedical industry, is commonly used but has slight disadvantages towards Ti-6Al-7Nb, regarding corrosion resistance and biocompatibility [13].…”

Section: Introductionmentioning

confidence: 99%

Low Cycle Fatigue Performance of Additively Processed and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical Applications

Hein

Kokalj

Dias

et al. 2022

Metals

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In biomedical engineering, laser powder bed fusion is an advanced manufacturing technology, which enables, for example, the production of patient-customized implants with complex geometries. Ti-6Al-7Nb shows promising improvements, especially regarding biocompatibility, compared with other titanium alloys. The biocompatible features are investigated employing cytocompatibility and antibacterial examinations on Al2O3-blasted and untreated surfaces. The mechanical properties of additively manufactured Ti-6Al-7Nb are evaluated in as-built and heat-treated conditions. Recrystallization annealing (925 °C for 4 h), β annealing (1050 °C for 2 h), as well as stress relieving (600 °C for 4 h) are applied. For microstructural investigation, scanning and transmission electron microscopy are performed. The different microstructures and the mechanical properties are compared. Mechanical behavior is determined based on quasi-static tensile tests and strain-controlled low cycle fatigue tests with total strain amplitudes εA of 0.35%, 0.5%, and 0.8%. The as-built and stress-relieved conditions meet the mechanical demands for the tensile properties of the international standard ISO 5832-11. Based on the Coffin–Manson–Basquin relation, fatigue strength and ductility coefficients, as well as exponents, are determined to examine fatigue life for the different conditions. The stress-relieved condition exhibits, overall, the best properties regarding monotonic tensile and cyclic fatigue behavior.

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Fatigue Life Prediction of Biomedical Titanium Alloys under Tensile/Torsional Stress

Cited by 6 publications

References 9 publications

Dental Implants Fatigue as a Possible Failure of Implantologic Treatment: The Importance of Randomness in Fatigue Behaviour

Dental Implants Fatigue as a Possible Failure of Implantologic Treatment: The Importance of Randomness in Fatigue Behaviour

Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion

Low Cycle Fatigue Performance of Additively Processed and Heat-Treated Ti-6Al-7Nb Alloy for Biomedical Applications

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