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Dissertations / Theses on the topic 'Aluminum alloys – Fatigue'

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Published: 4 June 2021

Last updated: 31 January 2023

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1

Saoudi, Abdelhamid. "Prédiction de la rupture par fatigue dans les pièces automobiles en alliages aluminium /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2008. http://theses.uqac.ca.

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Thèse (D.Eng.) -- Université du Québec à Chicoutimi, 2008.<br>La p. de t. porte en outre: Doctorat en ingénierie, thèse pour l'obtention du titre de Philosophiae Doctor en ingénierie. CaQQUQ Comprend des réf. bibliogr. (f. 174-178). Publié aussi en version électronique. CaQQUQ

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2

Ammar, Hany. "Effet des imperfections de la coulée sur les propriétés en fatigue des alliages de fonderie aluminium silicium = Effect of casting imperfections on the fatigue properties of aluminum-silicon casting alloys /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.

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3

Zhao, Tianwen. "Fatigue of aluminum alloy 7075-T651 /." abstract and full text PDF (UNR users only), 2009. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3342620.

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Thesis (Ph. D.)--University of Nevada, Reno, 2008.<br>"December, 2008." Includes bibliographical references (leaves 76-83). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.

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4

Jung, Hie-young. "Characterization of fatigue crack propagation in Al-Li 2090 alloys." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/20692.

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5

Subramaniam, Ameendraraj. "Fatigue behavior of copper zinc aluminum shape memory alloys." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/MQ32256.pdf.

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6

Wong, Yat Khin. "A phenomenological and mechanistic study of fatigue under complex loading histories." University of Western Australia. School of Mechanical Engineering, 2003. http://theses.library.uwa.edu.au/adt-WU2003.0017.

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[Truncated abstract. Please see pdf format for complete text.] Over the years much work has been done on studying sequence effects under multilevel loading. Yet, the underlying fatigue mechanisms responsible for such interactions are not fully understood. The study of fatigue under complex loading histories begins by investigating strain interaction effects arising from simple 2-step loading sequences. Fatigue for all investigations were conducted under uniaxial push-pull mode in strain-control. Fatigue is traditionally classified as either low or high cycle fatigue (LCF and HCF respectively

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7

Lemke, Kevin L. "A comparison of the fatigue properties of aluminum lithium 8090 forgings and 7050 aluminum plate in low strength orientations." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19971.

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8

Nelaturu, Phalgun. "Fatigue Behavior of A356 Aluminum Alloy." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849720/.

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Metal fatigue is a recurring problem for metallurgists and materials engineers, especially in structural applications. It has been responsible for many disastrous accidents and tragedies in history. Understanding the micro-mechanisms during cyclic deformation and combating fatigue failure has remained a grand challenge. Environmental effects, like temperature or a corrosive medium, further worsen and complicate the problem. Ultimate design against fatigue must come from a materials perspective with a fundamental understanding of the interaction of microstructural features with dislocations, un

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9

Jordon, James Brian. "EXPERIMENTS AND MODELING OF FATIGUE AND FRACTURE OF ALUMINUM ALLOYS." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062008-110529/.

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In this work, understanding the microstructural effects of monotonic and cyclic failure of wrought 7075-T651 and cast A356 aluminum alloys were examined. In particular, the structure-property relations were quantified for the plasticity/damage model and two fatigue crack models. Several types of experiments were employed to adapt an internal state variable plasticity and damage model to the wrought alloy. The damage model was originally developed for cast alloys and thus, the model was modified to account for void nucleation, growth, and coalescence for a wrought alloy. In addition, fatigue ex

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10

Arcari, Attilio. "Enhanced strain-based fatigue methodology for high strength aluminum alloys." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/26178.

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The design of any mechanical components requires an understanding of the general statical, dynamical and environmental conditions where the components will be operating to give a satisfactory results in terms of performance and endurance. The premature failure of any components is undesirable and potentially catastrophic, therefore predictions on performances and endurances of components to proceed with repair or substitution is vital to the stability of the structure where the component is inserted. The capability of a component of withstanding fatigue loading conditions during service is cal

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11

Vasudevan, Satish. "AN INVESTIGATION OF QUASI-STATIC BEHAVIOR, HIGH CYCLE FATIGUE AND FINAL FRACTURE BEHAVIOR OFALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 2219." Akron, OH : University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1193668130.

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Thesis (M.S.)--University of Akron, Dept. of Mechanical Engineering, 2007.<br>"December, 2007." Title from electronic thesis title page (viewed 02/23/2008) Advisor, T. S. Srivatsan; Faculty readers, Craig Menzemer, Amit Prakash; Department Chair, Celal Batur; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

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12

Vu, Chinh Q. L. "Fatigue Characteristics of New ECO Series Aluminum 7175 Alloy." PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/4985.

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In this dissertation, the fatigue characteristics of three newly developed experimental compositions for aluminum 7175, with improved mechanical strength, that uses magnesium-calcium alloy instead of pure magnesium are studied. Specimens of each variant were fabricated and subjected to fatigue life testing, fatigue life data analysis, and observation of their fracture characteristics through optical microscopy and scanning electron microscopy (SEM), and metallography to study their grains and surface characteristics. Fatigue life testing shows all three variants have a fatigue strength that is

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13

Blandford, Robert. "Characterization of fatigue crack propagation in AA 7075-T651." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-04092001-152127.

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14

Balasundaram, Arunkumar. "Effect of stress state and strain on particle cracking damage evolution in 5086 wrought al-alloy." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14809.

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15

Morin, Sébastien. "Effet du magnésium, des traitements thermiques et de la porosité sur les propriétés mécaniques de traction et de fatigue de l'alliage sous pression A380.1 /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2002. http://theses.uqac.ca.

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16

Cullers, Cheryl Lynne. "Deformation mechanisms of NiA1 cyclicly deformed near the brittle-to-ductile transition temperature." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/20050.

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17

Meyer-Rödenbeck, G. D. "An abrasive-corrosive wear evaluation of some aluminium alloys." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/18784.

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This investigation evaluates the abrasive-corrosive wear behaviour of aluminium alloys with the aim of establishing a data base of performance and guide lines for material optimisation. Wear test apparatus and standard tests developed by previous research programmes were utilised (Noel and Allen, 1981; Barker, 1988). Further tests were then devised for a more detailed characterisation of wear behaviour. Tests conducted showed that aluminium alloys have approximately a quarter to half the abrasion resistance of mild steel. Poor microfracture properties of Al-Si cast alloys were observed as a re

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18

Hamilton, Benjamin Carter. "Creep crack growth behavior of aluminum alloy 2519-T87." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/20500.

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19

Mayeur, Jason R. "Three Dimensional Modeling of Ti-Al Alloys with Application to Attachment Fatigue." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4923.

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The increasing use of alpha/beta Ti-Al alloys in critical aircraft gas turbine engine and airframe applications necessitates the further development of physically-based constitutive models that account for their complex microdeformation mechanisms. Alpha/beta Ti-Al alloys are dual-phase in nature consisting of a mixture of hcp (alpha) and bcc (beta) crystal structures, which through variation in alloying elements and/or processing techniques can be produced in a wide range of microstructural compositions and morphologies. A constitutive model for these materials should address the various so

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20

Dervenis, Constantine Peter. "Microstructure, deformation, and corrosion-fatigue properties of aluminum-lithium alloy 2090." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/11195.

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21

Khosla, Maya. "The effect of moisture exposure on pretreated aluminum alloys." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80060.

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Changes in pretreated 5182, 6061 and 7075 aluminum surfaces on exposure to moisture for short times was studied. The pretreatment used was the standard ASTM method for FPL etching of aluminum. The moisture treatment used was either immersion in water at 81° C or exposure to water vapor at 81° C. The experimental techniques used to analyze the pretreated aluminum surfaces before and after exposure to moisture were ESCA or XPS, AES, high resolution SEM, and specular reflectance FTIR. There was a change in the surface topography on exposure of the aluminum surfaces to water as determined using

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22

Lados, Diana Aida. "Fatigue crack growth mechanisms in Al-Si-Mg alloys." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0204104-125758.

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Thesis (Ph. D.)--Worcester Polytechnic Institute.<br>Keywords: Microstructure; Elastic-Plastic Fracture Mechanics; Crack closure; A356; J-integral; Conventionally cast and SSM Al-Si-Mg alloys; Residual stress; Heat treatment; Fatigue crack growth mechanisms; Threshold stress intensity factor; Plastic zone; Paris law; Fracture toughness; Roughness. Includes bibliographical references.

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23

Hamilton, Benjamin Carter. "Creep behavior of aluminum alloys C415-T8 and 2519-T87." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/20497.

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24

Jones, Kimberly A. "The creep behavior of aluminum alloy 8009." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19630.

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25

Rechberger, Johann. "The transition from stress corrosion cracking to corrosion fatigue in AA-7075 and AA-8090." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30779.

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The effect of crack tip strain rate (CTSR) on environmentally assisted cracking was studied for alloys AA-7075 (Al-Zn-Mg-Cu) and AA-8090 (Al-Li-Cu-Mg) in the artificially aged condition. Fatigue pre-cracked double cantilever beam (DCB) specimen were employed with the crack plane parallel to the rolling plane. The cracking behaviour under monotonic and cyclic loading conditions was investigated in aqueous sodium chloride solutions with and without additions of sodium chromate as a corrosion mhibitor. CTSR values were described in terms of K-rate ∆K/∆t (ie. dK/dt) as a measured average over the

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26

Peters, Donald Michael Dirk. "The effects of shot peening on low cycle fatigue life of 7075-T6 aluminium alloy round bar." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/2929.

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The aim in this dissertation was to improve our understanding of the effectiveness of shot peening in prolonging fatigue life, of 7075-T6 Aluminium Alloy round bar, taking into consideration surface residual stress, microstructural and micro-hardness parameters. Three point bending, high stress, moderately low cycle, fatigue tests were conducted to study the effects of shot peening and associated surface residual compressive stresses on fatigue life. The influence of shot peening on the microstructure was explored, including the application of mechanical small plastic straining and surface ski

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27

Haase, Jake D. "Microbeam diffraction mapping of microtexture in Al-Li 2090 T8E41." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19586.

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28

Cernyar, Jeffery. "Fatigue and fracture behavior of a 2124 aluminum alloy reinforced with silicon carbide whiskers." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/20053.

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29

Newman, John Andrew. "The Effects of Load Ratio on Threshold Fatigue Crack Growth of Aluminum Alloys." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/29418.

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The integrity of nearly all engineering structures are threatened by the presence of cracks. Structural failure occurs if a crack larger than a critical size exists. Although most well designed structures initially contain no critical cracks, subcritical cracks can grow to failure under fatigue loading, called fatigue crack growth (FCG). Because it is impossible or impractical to prevent subcritical crack growth in most applications, a damage tolerant design philosophy was developed for crack sensitive structures. Design engineers have taken advantage of the FCG threshold concept to design

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30

Ozdes, Huseyin. "The Relationship Between High-Cycle Fatigue and Tensile Properties in Cast Aluminum Alloys." UNF Digital Commons, 2016. http://digitalcommons.unf.edu/etd/716.

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Cast aluminum alloys are common in automotive and aerospace applications due to their high strength-to-density ratio. Fracture data for cast aluminum alloys, such as fatigue life, tensile strength and elongation, are heavily affected by the structural defects, such as pores and bifilms. There have been numerous studies in which either fatigue performance or tensile deformation were characterized and linked to casting defects. However, a comprehensive study that correlates tensile and fatigue properties has not been reported. The present study is motivated to fill this gap. The main objective o

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31

Iyyer, Nagaraja S. "Fatigue growth and closure of short cracks." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/52324.

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A study has been carried out to investigate the growth and closure behavior of short cracks in 2024-T351 aluminum alloy and four different conditions of 4340 steel using through thickness cracks of straight fronts. The experiments were carried out to study the influence of stress level, stress ratio, yield strength and prior austenitic grain A sizes in notched and unnotched specimens. The stereoimaging technique was developed and adapted to obtain crack closing and opening points, and also near tip displacement fields. Experimental results are presented with a general discussion. It was found

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32

Dabayeh, Ashraf A. "The role of casting defects in the fatigue behavior of notched cast aluminum alloys." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/NQ32821.pdf.

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33

McKnight, Dustin Henry. "The use of compression precracking constant amplitude (CPCA) test method to obtain near-threshold fatigue crack growth behavior in AA7075-T7351." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11102005-065337/.

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Traditionally, pre-cracking has been performed under tension-tension loading, followed by a load reduction scheme to obtain fatigue crack growth rate data in the near threshold regime. These data have been shown to exhibit load history effects due to remote crack closure. An alternative test method has been developed to minimize these load history effects. This test procedure uses compression pre-cracking to initiate a crack, followed by constant amplitude loading to grow the crack to failure. Compression-compression (C-C) loading as a means of forming a starter crack for fatigue crack growth

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34

Clark, David A. "Durability of the residual stresses surrounding cold expanded fastener holes in 7050-T7451 aluminum." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17828.

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35

Wen, Wei. "A THREE-DIMENSIONAL QUANTITATIVE UNDERSTANDING OF SHORT FATIGUE CRACK GROWTH IN HIGH STRENGTH ALUMINUM ALLOYS." UKnowledge, 2013. http://uknowledge.uky.edu/cme_etds/18.

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The behaviors of short fatigue crack (SFC) propagation through grain boundaries (GBs) were monitored during high cycle fatigue in an Al-Li alloy AA8090. The growth behaviors of SFCs were found to be mainly controlled by the twist components (α) of crack plane deflection across each of up to first 20 GBs along the crack path. The crack plane twist at the GB can result in a resistance against SFC growth; therefore SFC propagation preferred to follow a path with minimum α at each GB. In addition to the grain orientation, the tilting of GB could also affect α. An experiment focusing on quantifying

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36

Lovrich, Neil Robert. "Fretting Fatigue of Ti-6Al-4V: Experimental Characterization and Simple Design Parameter." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-07072004-113607/unrestricted/lovrich%5Fneil%5Fr%5F200408%5Fmast.pdf.

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Thesis (M.S.)--Mechanical Engineering, Georgia Institute of Technology, 2005. Directed by Richard Neu.<br>Johnson, Steven, Committee Member ; McDowell, David, Committee Member ; Neu, Richard, Committee Chair. Includes bibliographical references.

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37

Jin, Yan. "THREE-DIMENSIONAL MICROSTRUCTURAL EFFECTS ON MULTI-SITE FATIGUE CRACK NUCLEATION BEHAVIORS OF HIGH STRENGTH ALUMINUM ALLOYS." UKnowledge, 2016. http://uknowledge.uky.edu/cme_etds/63.

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An experimental method was further developed to quantify the anisotropy of multi-site fatigue crack initiation behaviors in high strength Al alloys by four-point bend fatigue testing under stress control. In this method, fatigue crack initiation sites (fatigue weak-links, FWLs) were measured on the sample surface at different cyclic stress levels. The FWL density in an alloy could be best described using a three-parameter Weibull function of stress, though other types of sigmoidal functions might also be used to quantify the relationship between FWL density and stress. The strength distributio

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38

Angeloni, Mauricio. "Fatigue life evaluation of A356 aluminum alloy used for engine cylinder head." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2011. http://tel.archives-ouvertes.fr/tel-00661622.

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The studied material is an A356 Al alloy, used to produce engine cylinder heads for the automotive industry by die casting process. The material displays a quite coarse dendritic microstructure in a eutectic matrix, with a mean grains size of 25 microns, intemetallic precipitates and porosities. The tensile properties are strongly affected by testing temperature, with a quite sensitive drop of the Young's modulus, the Yield stress as the temperature was raised. The isothermal fatigue life dropped of markedly (approximately 10 times) when the testing temperature is raised from 120 to 280 °C, un

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39

Li, Jinxia. "THE EFFECT OF MICROSTRUCTURE AND TEXTURE ON HIGH CYCLE FATIGUE PROPERTIES OF AL ALLOYS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/522.

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High cycle fatigue tests were carried out on a medium strength continuous casting AA 5754 Al alloy, and new generation high strength AA 2026 and AA 2099 Al alloys. The effect of texture on fatigue properties and short crack behavior were studied. The strengthening mechanisms were also thoroughly investigated for the two high strength alloys.Texture played an important role in the anisotropy of fatigue strength for the AA 5754 Al alloy. Being a solution strengthened alloy, it had a fatigue strength of 120% σy. High strength Al alloys had a strong tendency for planar slip due to the high density

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40

Zaat, Stephen Vincent. "The effects of ionized gas exposure on the toughness and fatigue properties of aluminum alloys and composites." Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056050094.

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41

Morano, Robert Natale. "Effect of R-ratio on crack closure in Al-Li 2090 T8E41, investigated non-destructively with x-ray microtomography." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19903.

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42

Schrock, David J. "The Effects of Loading Frequency, Sensitization Level, and Electrochemical Potential on Corrosion Fatigue Kinetics of Aluminum-Magnesium Alloys." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu158793003383275.

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43

Potirniche, Gabriel Petru. "FINITE ELEMENT MODELING OF CRACK TIP PLASTIC ANISOTROPY WITH APPLICATION TO SMALL FATIGUE CRACKS AND TEXTURED ALUMINUM ALLOYS." MSSTATE, 2003. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06242003-220551/.

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For the characterization of crack advance in mechanical components and specimens under monotonic and fatigue loading, many engineering approaches use the assumption that the plastic deformation at the crack tip is isotropic. There are situations when this assumption is not correct, and the modeling efforts require additional correction factors that account for this simplification. The goal of this work is to study two cases where the plastic anisotropy at the crack tip is predominant and influences the magnitude crack-tip parameters, which in turn determine the amount of crack advance under ap

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44

Morrissey, Ryan J. "Strain accumulation and shakedown in fatigue of Ti-6A1-4V by Ryan J Morrissey." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17144.

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45

Chenelle, Brendan F. "Friction Stir Welding in Wrought and Cast Aluminum Alloys: Microstructure, Residual Stress, Fatigue Crack Growth Mechanisms, and Novel Applications." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/1215.

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Friction Stir Welding (FSW) is a new solid-state welding process that shows great promise for use in the aerospace and transportation industries. One of the primary benefits of this process is that mechanical properties of the base material are not as severely degraded as they are with conventional fusion welding. However, fatigue crack initiation and growth properties of the resulting weld nugget are not fully understood at this time. The primary goal of this project is to characterize the fatigue crack growth properties of friction stir welds in 6061-T6 aluminum as relates to the microstruct

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46

Zhang, Ming. "Crystal plasticity modeling of Ti-6Al-4V and its application in cyclic and fretting fatigue analysis." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22669.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: David. L. McDowell; Committee Member: Min Zhou; Committee Member: Naresh N. Thadhani; Committee Member: Rami M. Haj-Ali; Committee Member: Richard W. Neu.

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47

Li, Yizhuo. "Experimental Study of Fatigue Properties under Different Loadings of an AA7075 Alloy Treated by SMAT." Thesis, Troyes, 2021. http://www.theses.fr/2021TROY0006.

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Les effets du SMAT sur les propriétés en fatigue uniaxiale et en torsion ont été étudiés pour un alliage d'aluminium 7075. Des éprouvettes de fatigue ont été traitées thermiquement pour augmenter la sensibilité du matériau au SMAT. Certaines propriétés de cet alliage traité par SMAT ont été caractérisées par des essais de traction et de microdureté. Par rapport à l'état brut d'usinage (AM), les durées de vie en fatigue uniaxiale des éprouvettes SMATées (AM-SMAT) sont augmentées pour des amplitudes de contrainte élevées, mais diminuées pour de faibles amplitudes. Cependant, pour les éprouvettes

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48

Brosi, Justin Keith. "Mechanical Property Evolution of Al-Mg Alloys Following Intermediate Temperature Thermal Exposure." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1270163761.

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Thesis (Master of Sciences (Engineering))--Case Western Reserve University, 2010<br>Department of Materials Science and Engineering Title from PDF (viewed on 2010-05-25) Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center

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49

Godbole, Chinmay. "The Influence of Reinforcement on Microstructure, Hardness, Tensile Deformation, Cyclic Fatigue and Final Fracture behavior of two Magnesium Alloys." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1321633235.

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50

Cai, Pei. "A MICROSTRUCTURE-BASED MODEL VALIDATED EXPERIMENTALLY FOR QUANTIFICATION OF SHORT FATIGUE CRACK GROWTH IN THREE-DIMENSIONS." UKnowledge, 2018. https://uknowledge.uky.edu/cme_etds/86.

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Built on the recent successes in understanding the crystallographic mechanism for short fatigue crack (SFC) growth across a grain boundary (GB) and developing an experimental method to quantify the GB resistance against short crack growth, a microstructure-based model was developed in this study to simulate the growth behaviors of SFCs in 3-D, by taking into account both the driving force and resistance along at each point along the crack front in an alloy. It was found that the GB resistance was a Weibull function of the minimum twist angle of crack deflection at the boundary in AA2024-T3 Al

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