D.H. Lammlein PhD Dissertation - Vanderbilt University

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Figure 137: Anvil-less butt/lap type weld joining 3 material sections and not performed in the experiments presented in this work. The joint and materials could alternatively be configured with the lateral interface following the curvature of the top surface. Unsupported welds of this kind with a traditional FSW tool create a bead type defect on the underside. A shoulder-less, conical tool was used in unsupported welds in the experiment. References: [1] Friction-stir butt welding; GB Patent No. 9125978.8, International patent application No. PCT/GB92/02203; W M Thomas, E D Nicholas, J C Needham, M G Murch, P Temple-Smith, C J Dawes; 1991 [2] Bobbin-Tool Friction-Stir Welding of Thick-Walled Aluminum Alloy Pressure Vessels; E N Dalder, J W Pastrnak, J Engel, R S Forrest, E Kokko, K Mc Ternan, D Waldron; Welding Journal (AWS), April 2008, 40-44 [3] Website: Space Electronics LLC, http://www.spaceelectronics.com/Products/air_bearings.php [4] Personal comunication with Dan Otlowski Space Electronics LLC [5] Stress and strain analysis of the spherical pressure vessel: analytical and numerical approach: J Sertić, D Kozak; Int Conf on Adv Tech for Developing Countries, Jun 28-30, 2006 Rijeka, Croatia [6] Spin dynamics of the LAGEOS satellite in support of a measurement of the earth’s Gravitomagnetism; S Habib, D E Holz; Phys. Rev. D 50, 6068 - 6079 (1994) [7] Website: Armadillo Aerospace, http://www.armadilloaerospace.com/n.x/Armadillo/Home/News?news_id=330 http://www.armadilloaerospace.com/n.x/armadillo/home/news?news_id=309 150
[8] Metallurgical analysis of ablated aluminum alloy hemispheres; G J Fischer, R Maciag ; Internal Report, Polytechnic Inst of Brooklyn NY, Jul 1962 [9] Numerical analysis of the nonlinear deformation of a spherical pressure vessel made of laminated glass-plastic; Y M Grigorenko, A T Vasilenko, N N Kryukov, and T V Krizhanovskaya; Prikladnaya Mekhanika, Vol. 23, No ii, pp. 27-32, November, 1987 [10] Experimental study of shape imperfections and the load-carrying capacity of hemispherical glass shells; P F Zolotarev; Problemy Prochnosti, No. I0, pp. 91-95, October, 1981 [11] Cryoformed stainless steel pressure vessels for space applications; A Faure, L Gourgeon; Proc Eur Conf on Spacecraft Struc, Mat and Mech Testing, Braunschweig Germany, 4-6 Nov 1998 [12] Estimating the carrying capacity of spherical vessels from dynamic loading data; I V Belinskii, E I Zharkov, N A Zvonarev; Fizika Goreniya i Vzryva, Vol. 28, No. 5, pp. 117- 119, Sep-Oct, 1992 [13] Elastic analysis for thick cylinders and spherical pressure vessels made of functionally graded materials; Y.Z. Chen, X.Y. Lin; Comp Mat Sci, 44 (2008) 581– 587 [14] A study on failure characteristic of spherical pressure vessel; H S Lee, J H Yoon, J S Park, Y M Yi; Journal of Mat Processing Tech 164–165 (2005) 882–888 [15] Study on spherical pressure vessel of ceramics for deep-sea buoyancy module applications; Y Yano, S Takagawa; Japan Agency for Marine-Earth Science and Technology (JAMSTEC); Oceans 2004 MTS, 1554- 1559 Vol.3 [16] Design and development of an aluminum lined composite overwrapped spherical pressure vessel; R Veys, A Cederberg, D B Tiller; Brunswick Corporation, Defense Division, Lincoln Nb, Internal Report AIAA-89-2642, 1989 [17] Design and development of a carbon overwrapped aluminum lined spherical pressurant tank; D B Tiller, C F Murray, R B Veys; Brunswick Corporation, Defense Division, Lincoln Nb, Internal Report, 1990 [18] Behavior and ultimate tensile strength of partial penetration groove welds; D P Gagnon, D J Kennedy, 1987 [19] Evaluation and tensile strength of partial penetration butt welded joints by ultrasonic testing; H Matsuura, A Kaji; Jpn Soc Mech Eng , Vol 66, No 647, A, 1419-1424, 2000 [20] The Effect of Mismatch on the Collapse Strength of Machined Hemispherical Shells; M G Costello; Naval Ship Research and Development Center, Washington DC, Internal Report Ad0874760, 1970 [21] A new, highly efficient deep water ROV buoyancy system; E M Patton, T S Rennick; Offshore Technology Conference, 3 May-6 May 1999, Houston Tx [22] Partial-penetration welded connections for aluminum compression members; J H Jennison, R S Gill; Naval Ordinance Test Station, China Lake Ca, Internal Report AD0602361, 1964 [23] Method of friction stir welding and retractable shoulderless variable penetration friction stir welding tool; US Patent #7,234,626; T Trapp, J Fischer, J Bernath; Edison Welding Institute (EWI), 2007 [24] Retractable shoulderless variable penetration friction stir welding tool; US Patent #7,404,510; T Trapp, J Fischer, J Bernath; Edison Welding Institute (EWI), 2007 151
Page 1 and 2:
FRICTION STIR WELDING OF SPHERES, C
Page 3 and 4:
TABLE OF CONTENTS TABLE OF FIGURES
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Appendix ..........................
Page 7 and 8:
Figure 16: Left(FE streamline), Mid
Page 9 and 10:
Figure 51: A thermal camera image t
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for a similar conventional weld (3/
Page 13 and 14:
Figure 102: Tapered retraction proc
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setting are indicated. Note that st
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Unsupported welds of this kind with
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Figure 157: A thermal camera image
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ottom sample is a tungsten inert ga
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N - newton (force unit) n - visco-p
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INTRODUCTION Friction Stir Welding,
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educed conduction lengths. In small
Page 29 and 30:
CHAPTER I LITERATURE REVIEW: COMPUT
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frictional condition at the interfa
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contact. The contact area can inclu
Page 35 and 36:
For horizontal sections, a heat inp
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(1.11) where r p is the probe (pin)
Page 39 and 40:
This efficiency term, η pd , is kn
Page 41 and 42:
The heat input on the tool surface
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The added complication of these met
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Figure 5: Lateral cross sections of
Page 47 and 48:
Flow stress in aluminum alloys is d
Page 49 and 50:
Figure 8: Three flow fields a) rota
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and post-weld cool-down. This model
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Williams et al. [60] use a 2D-axisy
Page 55 and 56:
Figure 16: Left(FE streamline), Mid
Page 57 and 58:
Figure 18: Temperature contour over
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Figure 22: Temperature distribution
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Figure 24: Lateral velocity contour
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Figure 26: Experimental(white) vers
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Figure 28: Top view schematic of tu
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[5] Taylor RE, Groot H, Goerz T, Fe
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[41] Heinz B., Skrotzki B., Eggler
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CHAPTER II COMPUTATIONAL ANALYSIS O
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Figure 30: Blind t-joint setup with
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Figure 33: Process forces and later
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Figure 35: Experimental Welds, Axia
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Figure 37: FEA boundary conditions
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A 4500 N axial force is applied eve
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axial force with lateral offset dur
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Figure 42: Contour plot of von Mise
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Figure 44: Deformation contour for
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Figure 46: Quarter-plate model for
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Figure 49: Contour plot of deflecti
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where P is the weld power (W), Q is
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Figure 52: Fluent CFD model zones.
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Figure 55: Thermal contour of weld
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Figure 59: Thermal contour of weld
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Figure 61: Velocity vectors for 0.0
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Figure 65: Contour of velocity magn
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CHAPTER III THE APPLICATION OF SHOU
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Figure 66: A shoulder-less, conical
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Figure 68: Typical axial(Z-axis) fo
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Figure 71: 90° conical tool macros
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Figure 75: Run 3, 80° conical tool
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Figure 79: (90º tool) Ultimate ten
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Figure 83: (90º tool) Lateral forc
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Figure 87: (80º tool) Lateral forc
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The Eulerian, finite volume, CFD so
Page 123 and 124: Figure 92 shows the increasing elem
Page 125 and 126: Figure 91: CFD model geometry consi
Page 127 and 128: Figure 95: Lateral cross-section of
Page 129 and 130: Figure 96: Attempts a probe tapered
Page 131 and 132: CHAPTER IV THE FRICTION STIR WELDIN
Page 133 and 134: applications for its high strength
Page 135 and 136: Figure 97: Experimental weld sample
Page 137 and 138: Figure 99: Split protrusion type de
Page 139 and 140: with a cupped recess. It is however
Page 141 and 142: of tapered retraction (i.e. move th
Page 143 and 144: The adjustments in vertical positio
Page 145 and 146: manners the assigned depth was main
Page 147 and 148: Figure 108: Lateral macrosections f
Page 149 and 150: Figure 110: (Supported, cupped tool
Page 155 and 156: apparent strength of 26% parent whi
Page 157 and 158: with a 100º conical tool (0.025”
Page 159 and 160: Figure 119: Macrosection view of an
Page 161 and 162: and tooling. Torque is highly depen
Page 163 and 164: locally in proportion to the local
Page 165 and 166: Figure 126: (threaded tool) Contour
Page 167 and 168: Figure 128: (conical tool) Geometry
Page 169 and 170: Figure 131: (threaded tool) Lateral
Page 171 and 172: The results presented here show tha
Page 173: Figure 136:(from left: Tapered retr
Page 177 and 178: CHAPTER V FRICTION STIR WELDING OF
Page 179 and 180: Collaboration between Advanced Meta
Page 181 and 182: eccentricity, the method of interio
Page 183 and 184: gas tungsten arc welding of small d
Page 185 and 186: Full penetration welds of 4.2” (1
Page 187 and 188: Figure 143: The curvature of the pi
Page 189 and 190: Figure 144: Experimental axial forc
Page 191 and 192: Together, a fine wall thickness tol
Page 193 and 194: Figure 147: Axial force history for
Page 195 and 196: The weld macrosections show complet
Page 197 and 198: Figure 154: Macrosections of welds
Page 199 and 200: Figure 157: A thermal camera image
Page 201 and 202: Figure 159: Average tool shank temp
Page 203 and 204: 471,146 faces. The meshes are fine
Page 205 and 206: Figure 162: A closeup view of mesh
Page 207 and 208: 4 2 3 4 5 16 " 1.745 2 0.24
Page 209 and 210: applied heat locally in proportion
Page 211 and 212: Figure 164: Modeled temperature con
Page 217 and 218: Figure 172: Model pathlines for the
Page 219 and 220: Figure 174: Model pathlines for the
Page 221 and 222: later speed setting, the tool welds
Page 223 and 224: Figure 178: Zoom view of a macro ta
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Figure 180: The superficial appeara
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Figure 182: The rotary welding appa
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Figure 185: A diagram illustrating
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CONCLUSION AND FUTURE WORK Conclusi
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new FSW process environment is reso
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D.H. Lammlein PhD Dissertation - Vanderbilt University

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