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Research Papers

Investigating Discrepancies in Vibration Bending Fatigue Behavior of Additively Manufactured Titanium 6Al-4V

[+] Author and Article Information
Onome Scott-Emuakpor

Mem. ASME
Air Force Research Laboratory,
Aerospace Systems Directorate,
Wright-Patterson AFB, OH 45433
e-mails: onomese@hotmail.com; onome.scott-emuakpor.1@us.af.mil

Casey Holycross

Mem. ASME
Air Force Research Laboratory,
Aerospace Systems Directorate,
Wright-Patterson AFB, OH 45433
e-mail: caseyholycross@gmail.com

Tommy George

Mem. ASME
Air Force Research Laboratory,
Aerospace Systems Directorate,
Wright-Patterson AFB, OH 45433
e-mail: tommy.george@us.af.mil

Luke Sheridan

Mem. ASME
Air Force Research Laboratory,
Aerospace Systems Directorate,
Wright-Patterson AFB, OH 45433
e-mail: luke.sheridan.1@us.af.mil

Emily Carper

Mem. ASME
Air Force Research Laboratory,
Aerospace Systems Directorate,
Wright-Patterson AFB, OH 45433
e-mail: emily.carper@us.af.mil

Joseph Beck

Mem. ASME
Perceptive Engineering Analytics, LLC,
Minneapolis, MN 55418
e-mail: Joseph.A.Beck@peanalyticsllc.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received July 13, 2018; final manuscript received February 12, 2019; published online March 12, 2019. Assoc. Editor: Anastasia Muliana. The work was authored in part by a U.S. Government employee in the scope of his/her employment. ASME disclaims all interest in the U.S. Government’s contribution.

J. Eng. Mater. Technol 141(4), 041002 (Mar 12, 2019) (9 pages) Paper No: MATS-18-1208; doi: 10.1115/1.4042955 History: Received July 13, 2018; Accepted February 12, 2019

The vibration bending fatigue life uncertainty of additively manufactured titanium (Ti) 6Al-4V specimens is studied. In this investigation, an analysis of microscopic discrepancies between ten fatigued specimens paired by stress amplitude is correlated with the bending fatigue life scatter. Through scanning electron microscope (SEM) analysis of fracture surfaces and grain structures, anomalies and distinctions such as voids and grain geometries are identified in each specimen. These data along with previously published results are used to support assessments regarding bending fatigue uncertainty. The understanding gained from this study is important for the future development of a predictive vibration bending fatigue life model.

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References

ASTM F2924-14, 2014, Standard Specification for Additive Manufacturing Titanium-6 Aluminum-4 Vanadium with Powder Bed Fusion, ASTM International, West Conshohocken, PA.
ASTM F2971-13, 2013, Standard Practice for Reporting Data for Test Specimens Prepared by Additive Manufacturing, ASTM International, West Conshohocken, PA.
ASTM F3049-14, 2014, Standard Guide for Characterizing Properties of Metal Powders Used for Additive Manufacturing Processes, ASTM International, West Conshohocken, PA.
Yakinthos, K., Missirlis, D., Palikaras, A., Storm, P., Simom, B., and Goulas, A., 2007, “Optimization of the Design of Recuperative Heat Exchangers in the Exhaust Nozzle of an Aero Engine,” Appl. Math. Model., 31(11), pp. 2524–2541. [CrossRef]
Sunden, B., 2013, “Heat Exchangers and Heat Recovery Processes in Gas Turbine Systems,” Modern Gas Turbine Systems, Lund University, Sweden, pp. 224–246.
Traverso, A., and Massardo, A., 2005, “Optimal Design of Compact Recuperators for Microturbine Application,” Appl. Therm. Eng., 25(14–15), pp. 2054–2071. [CrossRef]
Shih, H.-Y., and Huang, Y.-C., 2009, “Thermal Design and Model Analysis of the swiss-Roll Recuperator for an Innovative Micro Gas Turbine,” Appl. Therm. Eng., 29(8–9), pp. 1493–1499. [CrossRef]
Engine Structural Integrity Program (ENSIP), MIL HDBK-1783B (USAF), 15 Feb 2002.
Scott-Emuakpor, O., George, T., Henry, E., Holycross, C., and Brown, J., 2017, “As-Built Geometry and Surface Finish Effects on Fatigue and Tensile Properties of Laser Fused Titanium 6Al-4V,” ASME/Turbo Expo, Charlotte, NC, June 26–30, ASME Paper No. GT2017-63482.
Nicholas, T., 2006, High Cycle Fatigue: A Mechanics of Materials Perspective, Elsevier, Oxford, UK.
George, T., Seidt, J., Shen, M.-H. H., Cross, C., and Nicholas, T., 2004, “Development of a Novel Vibration-Based Fatigue Testing Methodology,” Int. J. Fatigue, 26, pp. 477–486. [CrossRef]
Matissek, K., Scott-Emuakpor, O., George T, Holycross, C., Crowe, T., and Howard, C., 2017, “Regression Study on Variables Affecting Vibration Fatigue Behavior of Additive Manufactured Titanium 6Al-4V,” ASME/Turbo Expo, Charlotte, NC, June 26–30, ASME Paper No. GT2017-64049.
Howard, C., 2016, “Investigation of Surface Roughness Effects on Material Behavior of Additive Manufactured Titanium 6Al-4V,” Dayton Engineering Sciences Symposium, Dayton, OH, Nov. 1.
Crowe, T., 2016, “Geometric Deviation and the Effect on Fatigue Life of Additive Manufactured Titanium 6Al-4V,” Dayton Engineering Sciences Symposium, Dayton, OH, Nov. 1.
Scott-Emuakpor, O., George, T., Holycross, C., and Cross, C., 2016, “Improved Hybrid Specimen for Vibration Bending Fatigue,” Fatigue, Fracture, Failure and Damage Evolution, Vol. 8, A. Zehnder et al. , eds., Springer, New York, pp. 21–30.
Metallic Materials Properties Development and Standardization, MMPDS-08, Battelle Memorial Institution, 1 Apr. 2013.
George, T., Shen, M.-H. H., Cross, C., and Nicholas, T., 2006, “A New Multiaxial Fatigue Testing Method for Variable Amplitude Loading and Stress Ratio,” ASME J. Eng. Gas Turbines Power, 128, pp. 857–864. [CrossRef]
Bruns, J., Zearley, A., George, T., Scott-Emuakpor, O., and Holycross, C., 2015, “Vibration-Based Bending Fatigue of a Hybrid Insert-Plate System,” J. Exp. Mech., 55(6), pp. 1067–1080. [CrossRef]
Scott-Emuakpor, O., Shen, M.-H. H., George, T., and Cross, C., 2008, “An Energy-Based Uniaxial Fatigue Life Prediction Method for Commonly Used Gas Turbine Engine Materials,” ASME J. Eng. Gas Turbines Power, 130(6), p. 062504. [CrossRef]
Scott-Emuakpor, O., Schwartz, J., George, T., Holycross, C., Cross, C., and Slater, J., 2015, “Bending Fatigue Life Characterization of Direct Metal Laser Sintering Nickel Alloy 718,” Fatigue Fract. Eng. Mater. Struct., 38(9), pp. 1105–1117. [CrossRef]
Bruns, J., 2014, “Fatigue Crack Growth Behavior of Structures Subject to Vibratory Stresses,” Society of Experimental Mechanics Annual Conference, Greenville, SC, June 2–6.
Scott-Emuakpor, O., Holycross, C., George, T., Beck, J., Schwartz, J., Shen, M.-H. H., and Slater, J., 2014, “Material Property Determination of Vibration Fatigued DMLS and Cold-Rolled Nickel Alloys,” ASME/Turbo Expo, Dusseldorf, Germany, June 16–20, ASME Paper No. GT2014-26247.
Maxwell, D. C., and Nicholas, T., 1998, “A Rapid Method for Generation of a Haigh Diagram for High Cycle Fatigue,” J. Fatigue Fract. Mech., 29, pp. 626–641, ASTM STP 1321.
Bellows, R., Muju, S., and Nicholas, T., 1999, “Validation of the Step Test Method for Generating Haigh Diagrams for Ti-6Al-4V,” Int. J. Fatigue, 21(7), pp. 687–697. [CrossRef]
Scott-Emuakpor, O., George, T., Cross, C., Wertz, J., and Shen, M.-H. H., 2012, “A New Distortion Energy-Based Equivalent Stress for Multiaxial Fatigue Life Prediction,” Int. J. Non-Linear Mech., 47(3), pp. 29–37. [CrossRef]
Newton, T., Melkote, S., Watkins, T., Trejo, R., and Reister, L., 2009, “Investigation of the Effect of Process Parameters on the Formation and Characteristics of Recast Layer in Wire-EDM of Inconel 718,” Mater. Sci. Eng.: A, 513–514, pp. 208–215. [CrossRef]
Kaszynski, A., Beck, J., and Brown, J., 2013, “Uncertainties of an Automated Optical 3D Geometry Measurement Modeling and Analysis Process for Mistuned IBR Reverse Engineering,” ASME/IGTI Turbo Expo, San Antonio, TX, ASME Paper No. GT2013-95320.
Kaszynski, A., Beck, J., and Brown, J., 2015, “Experimental Validation of a Mesh Quality Optimized Morphed Geometric Mistuning Model,” ASME/IGTI Turbo Expo, Montreal, Quebec, Canada, ASME Paper No. GT2015-43150.
Thurstone, L. L., 1947, Multiple Factor Analysis, University of Chicago Press, Chicago, IL.
Abdi, H., Williams, L., and Valentin, D., 2013, “Multiple Factor Analysis: Principal Component Analysis for Multitable and Multiblock Data Sets,” Computational Statistics, 5(2), pp. 149–179. [CrossRef]
Henry, E., Brown, J., and Slater, J., 2015, “A Fleet Risk Prediction Methodology for Mistuned IBRs Using Geometric Mistuning Models,” AIAA Science and Technology Forum and Exposition, Orlando, FL, Jan. 5–9, AIAA Paper No. AIAA 2015-1144.
Ugural, A., and Fenster, S., 2003, Advanced Strength and Applied Elasticity, 4th ed., Prentice Hall, Upper Saddle River, NJ.
Shigley, J., and Mischke, C., 1989, Mechanical Engineering Design, 5th ed., McGraw-Hill, New York.
Anderson, T., 2005, Fracture Mechanics: Fundamentals and Applications, 3rd ed., Taylor and Francis, Boca Raton, FL.
Pilkey, W., and Pilkey, D., 2008, Peterson’s Stress Concentration Factors, 3rd ed., John Wiley & Sons, Hoboken, NJ.
Bennett, J., and Weinberg, J., 1954, “Fatigue Notch Sensitivity of Some Aluminum Alloys,” J. Res. Natl Bureau Stand., 52(5), pp. 235–245. [CrossRef]
Owolabi, G., Okeyoyin, O., Bamiduro, O., and Whitworth, H., 2014, “Extension of a Probabilistic Mesomechanics Based Model for Fatigue Notch Factor to Titanium Alloy Components,” Procedia Materials Science 3, 20th European Conference on Fracture, pp. 1860–1865.
Whaley, R., 1962, “Fatigue and Static Strength of Notched and Unnotched Aluminum-Alloy and Steel Specimens,” J. Exp. Mech., 2(11), pp. 329–334. [CrossRef]
Kahlin, M., Ansell, H., and Moverare, J., 2017, “Fatigue Behaviour of Notched Additive Manufactured Ti6Al4V With As-Built Surfaces,” Int. J. Fatigue, 101(Part 1), pp. 51–60. [CrossRef]
Haritos, G., Nicholas, T., and Lanning, D., 1999, “Notch Size Effects in HCF Behavior of Ti-6Al-4V,” Int. J. Fatigue, 21(7), pp. 643–652. [CrossRef]
Scott-Emuakpor, O., Holycross, C., George, T., Knapp, K., and Beck, J., 2016, “Fatigue and Strength Studies of Titanium 6Al-4V Fabricated by Direct Metal Laser Sintering,” ASME J. Eng. Gas Turbines Power, 138(2), p. 022101. [CrossRef]
ASM Handbook, 1996, “Volume 19: Fatigue and Fracture,” ASM International, Materials Park, OH.
Sangid, M., Maier, H., and Sehitoglu, H., 2011, “The Role of Grain Boundaries on Fatigue Crack Initiation—An Energy Approach,” Int. J. Plasticity, 21(5), pp. 801–821. [CrossRef]
Hayes, B., Martin, B., Welk, B., Kuhr, S., Ales, T., Brice, D., Ghamarian, I., Baker, A., Haden, C., Harlow, D., Fraser, H., and Collins, P., 2017, “Predicting Tensile Properties of Ti-6Al-4V Produced via Directed Energy Deposition,” Acta Mater., 133, pp. 120–133. [CrossRef]
Nalla, R., Campbell, J., and Ritchie, R., 2002, “Mixed-Mode, High-Cycle Fatigue-Crack Growth Thresholds in Ti-6Al-4V: Role of Small Cracks,” Int. J. Fatigue, 24(10), pp. 1047–1062. [CrossRef]
Marcus, H., and McEvily, A., 1999, “On Crack Closure and Crack Tip Shielding During Fatigue Crack Growth,” Review of Progress in Quantitative Nondestructive Evaluation, Vol. 18, D. Thompson, ed., Kluwer Academic/Plenum Publishers, New York, pp. 1651–1656.

Figures

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Fig. 1

Insert specimen for vibration bending fatigue test (mm) [9]

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Fig. 2

Vibration bending fatigue test setup [15]

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Fig. 3

Hybrid specimen with instrumentation location [15]

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Fig. 4

Build types with maximum normal strain directions experienced during fatigue and tensile testing [9]

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Fig. 5

Vibration bending fatigue life comparisons of LPBF Ti 6Al-4V builds [9]

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Fig. 6

PCA z-score versus stress amplitude: horizontal specimen [9]

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Fig. 7

PCA z-score versus stress amplitude: vertical specimen [9]

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Fig. 8

PCA z-score versus stress amplitude: thick specimens [9]

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Fig. 9

Fracture surface images: (a) H-INS-2 and (b) H-INS-8

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Fig. 10

Fracture surface images: (a) V-INS-2 and (b) V-INS-11

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Fig. 11

Fracture surface images: (a) TH-INS-2 and (b) TH-INS-4

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Fig. 12

Fracture surface images: (a) H-INS-4 and (b) H-INS-6

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Fig. 13

Fracture surface images: (a) V-INS-4 and (b) V-INS-6

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Fig. 14

Keyence contour plot of void on specimen V-INS-2 fracture surface

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Fig. 15

Elliptical hole in the flat plate

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Fig. 16

Notch sensitivity factors for alpha–beta titanium alloys

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Fig. 17

Ti 6Al-4V fatigue data with stress concentration factor correction

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Fig. 18

Micrographs of Ti 6Al-4V: (a) cold-rolled, (b) thick, (c) vertical, and (d) horizontal

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Fig. 19

Ti 6Al-4V fatigue data with lamellae variation error bars

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Fig. 20

Fracture surface and void of fatigue specimen V-INS-6

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Fig. 21

Crack growth plot comparing LPBF data with cast Ti 6Al-4V properties

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Fig. 22

Ti 6Al-4V energy release rate comparisons between LPBF data in earlier sections and previously published data from Nalla et al. [45]

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