Stability of shot peen residual stresses in IN100 subjected to creep and fatigue loading

John, Reji; Buchanan, Dennis J.; Caton, Michael J.; Jha, S. K.

doi:10.1016/j.proeng.2010.03.203

Cited by 35 publications

(23 citation statements)

References 15 publications

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“…The stability of the residual stress field has been investigated by a number of researchers for shot peened steel [13][14][15][16][17], nickel base superalloys [18][19][20], and titanium alloys [21]. However, the relaxation of LSP'd residual stress has not been extensively studied to date although resistance to fretting has been quantified [9].…”

Section: Introductionmentioning

confidence: 99%

Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth

2015

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Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth. Acta Materialia, http://dx.doi.org/10.1016/j.actamat.2014.09.032 conditions. The ballistic FOD impacts were introduced by impacting a cube edge at an angle of head-on (0 degrees) to the leading edge. The residual stress distributions have been mapped by synchrotron X-ray diffraction prior to cracking and subsequent to short (~1 mm) and long (up to 6 mm) crack growth. 2The results suggest that the local residual stress field is highly stable even to the growth of relatively long cracks.

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Section: Introductionmentioning

confidence: 99%

Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth

2015

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“…Other materials that during the years have been shot peened successively and obtained increased fatigue strength are titanium, aluminium and superalloys [43][44][45][46][47][48][49][50][51]. Also some brittle materials [52][53][54], like ceramics, which have been shot peened with proper shot peening parameters, have shown an increase in fatigue strength.…”

Section: Shot Peeningmentioning

confidence: 99%

Residual Stresses and Fatigue of Shot Peened Cast Iron

Lundberg¹

2013

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ii Cover:Fracture surface of compact graphite iron with a graphite nodule.Printed by: LiU-Tryck, Linköping, Sweden, 2013 ISBN 978-91-7519-501-8 ISSN 0280-7971 Distributed by: Linköping University Department of Management and Engineering 581 83, Linköping, Sweden ©2013 Mattias Lundberg iii AbstractThe complex geometry of cylinder head in heavy-duty diesel engine makes grey cast iron or compact graphite iron a perfect material choice due to its castability, thermal conductivity and damping capacity. To increase the efficiency of the engine, the fatigue property of the material needs to be improved. Shot peening is often used to increase the fatigue strength of components. The benefits are associated with the compressive stresses induced and with surface hardening. In this research project, these effects on grey and compact iron have been analyzed for different shot peening parameters using XRD, SEM and fatigue testing methods. The ultimate aim of the project is to increase the fatigue strength of cast irons by optimization of residual stresses.The XRD measurements and SEM examinations revealed that the shot peening parameters including shot size and peening intensity had significant influences on the resulted residual stresses and strain hardening while changing the coverage made little difference. Also differences in the peening results between the two materials were observed, which were ascribed to an effect of the different graphite morphology. Nevertheless, a residual stress profile similar to the one general considered to improve the fatigue strength in steels could be obtained in both grey and compact iron after shot peening.The axial fatigue testing with R=-1 on the grey iron showed that peening using large shot size and high peening intensity (heavy shot peening) resulted in a fatigue strength reduction of 15-20% in comparison with the mechanically polished surface. The negative effects are likely related to surface damage and relatively high tensile residual stresses in subsurface induced by the heavy peening. Grey cast iron has low ductility in tension and therefore tensile residual stresses may promote multiple cracking and crack networking during cyclic loading.Shot peening using much smaller shots and lower intensity (gentle shot peening) which resulted in a much smaller residual stress field gave no significant changes in fatigue strength. However, a short time annealing at 285°C of specimens being gently shot peened increased the fatigue strength roughly by 10%. The improvement could be an effect of precipitates formed due to the heat treatment, which lock the dislocation movement under cyclic loading. iv v

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“…Models are being developed to predict the remaining life of components, based on the remaining residual stress [John et al, 2010]. Ideally, a direct measurement of the residual stress coupled with the model predictions would be an ideal way to estimate the remaining life.…”

Section: Figure 1 Potential Applications From Radiation and Particlementioning

confidence: 99%

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

Goss¹

2013

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY)2. REPORT TYPE 3. DATES COVERED (From -To) AFRL/RQTC SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RQ-WP-TR-2013-0189 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESReport contains color. PA Case Number: 88ABW-2013-5333; Clearance Date: 17 Dec 2013. On many of the papers, the U.S. Government is joint author and has the right to use, modify, reproduce, release, perform, display, or disclose the work. ABSTRACTThis report describes the results of experimental and numerical investigations on the development of extreme-light diagnostics. The purpose of this program was to develop extreme-light diagnostic tools that could be utilized in the future for exploring new frontiers of aerospace science and performing in-place nondestructive evaluation and inspections of newly manufactured and fielded weaponssystems components. The objectives of this research program were realized through an extensive experimental campaign that utilized ultrafast and ultraintense laser systems for the development of advanced sources of secondary emission for nondestructive evaluation. The secondary sources were to include X-rays, energetic electrons, neutrons, and protons. At the crux of the work was the fundamental interaction between an incident, ultrafast, ultraintense laser pulse and a material target. A variety of target materials was explored in this work, and much of the effort was spent on fundamental studies. The results of these studies will serve to guide engineering efforts in establishing these sources for future Air Force applications. Most of the effort was directed toward the development of hard X-ray sources using both metal and liquid targets.The following titles, which have been published in professional journals and conference proceedings or are unpublished reports/presentations, are provided in this report:  "Efficiency and scaling of an ultrashort-pulse high-repetition-rate laser-driven X-ray source"  "An Evaluation of fs/ns-LIBS for Measuring Total Particulate Emissions"  "Picosecond Laser Machining of Shaped Holes In Thermal Barrier Coated Turbine Blades"  "Doub...

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Stability of shot peen residual stresses in IN100 subjected to creep and fatigue loading

Cited by 35 publications

References 15 publications

Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth

Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth

Residual Stresses and Fatigue of Shot Peened Cast Iron

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

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