Residual Strength and Fatigue Lifetime of ... - Solid Mechanics

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Bezazi A., Mahi A. E., Berthelot J. M. and Bezzazi B. (2009), Experimental Analysis of Behavior and Damage of Sandwich Composite Materials in Three-Point Bending Part 2: Fatigue Test Results and Damage Mechanisms, Strength of Materials, 41(3): 257-267. Billardon R. (1989), Etude de la rupture par la mecanique de I’endommagement, These de Doctorat es Sciences, Universite Paris 6. Blasques, J. P., Stolpe, M. (2011), Multi-Material Topology Optimization of Laminated Composite Beam Cross Sections, International Journal for Numerical Methods in Engineering, (submitted). Boisse P., Bussy P. and Ladeveze P. (1990), A New Approach in Nonlinear Mechanics – the Large Time Increment Method, International Journal of Numerical Methods in Engineering, 29: 647–663. Bozhevolnaya E., Jakobsen J. and Thomsen O. T. (2009), Fatigue Performance of Sandwich Beams With Peel Stoppers, Strain, 45: 349–357. Burman M. and Zenkert D. (1997), Fatigue of Foam Core Sandwich Beams, Part I: Undamaged Specimens, International Journal of Fatigue, 19: 551–561. Burman M. and Zenkert D. (1997), Fatigue of Foam Core Sandwich Beams, Part II: Effect of Initial Damages, International Journal of Fatigue, 19: 563–578. Burman M. and Zenkert D. (2000), Fatigue of Undamaged and Damaged Honeycomb Sandwich Beams, Journal of Sandwich Structures and Materials, 2: 50-74. Burman, M. (1998), Fatigue Crack Initiation and Propagation in Sandwich Structures, Doctoral Thesis, Department of Aeronautics, Royal Institute of Technology. Cantwell W. J. and Davies P. (1994), A Test Technique for Assessing Core-Skin Adhesion in Composite Sandwich Structures, Journal of Material Science Letters, 13: 203–205. Cantwell W. J. and Davies P. (1996), A Study of Skin-Core Adhesion in Composite Sandwich Materials, Advanced Composite Materials, 3: 407-420. Cantwell W. J., Scudamore R., Ratcliffe J. and Davies P. (1999), Interfacial Fracture in Sandwich Laminates, Composites Science and Technology, 59: 2079–2085. Carlsson L. A, Sendlein L. S, and Merry S. L. (1991), Characterization of Face/Core Shear Fracture of Composite Sandwich Beams, Journal of Composite Materials, 25(1):101–16. Chen H. and Bai, R. (2002), Postbuckling Behavior of Face/Core Debonded Composite Sandwich Plate Considering Matrix Crack and Contact Effect, Composite structures, 57: 305- 313. 138
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Residual Strength and Fatigue Lifet
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Published in Denmark by Technical U
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This page is intentionally left bla
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method to accelerate the simulation
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Synopsis Sandwich kompositter er i
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Contents Preface Executive Summary
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5 Face/core Interface Fatigue Crack
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H11 bimaterial constant H22 bimater
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These peculiar damage modes often r
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1.2 Overview of the Thesis In this
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Figure 1.3: Fracture modes, from Be
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In Equations (1.5) and (1.6) H11, H
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Figure 1.6: Schematic illustration
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The compact tension specimen (CT) i
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A Figure 1.10: CSB, DCB, TSD, DCB-U
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Chapter 2 Buckling Driven Face/Core
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(DIC) measurement system (ARAMIS 2M
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corresponds to the onset of debond
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Figure 2.7: Crack kinking into the
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(2.2) where and for plane str
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A modified version of the tilted sa
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previous observations of crack path
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of contact elements (CONTACT173 and
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the debond opening initially increa
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Table 2.4: Instability loads determ
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G (J/m2) 600 400 200 0 H100 IMP=0.1
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Hayman (2007) has described a damag
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Table 3.1: Panel test specimens. La
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sheet and the core thickness, respe
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Load (N) 250 200 150 100 50 0 H130
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Table 3.4: Parameters in the face/c
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was used to monitor 3D surface disp
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arising due to the junction between
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(a) Debonded face sheet Figure 3.16
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Figure 3.19 shows the determined en
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H130 MMB H130 Panel H250 MMB Interf
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3.6 Conclusion In this chapter the
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composite laminates under thermal c
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S S y( t ) y( t ) ( t ) 2 1 12 2
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listed in Table 4.1. The length and
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The strain energy release rate, G,
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high growth rate of G (see Figure 4
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4.4 Face/Core Fatigue Crack Growth
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Debond 310 mm Symmetry B. C. a Figu
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B 2 1/ 2 ( S44 S55 S45) (4.17) wh
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75), which illustrates possible ina
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Figure 4.18 (a) presents the deflec
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Debond radius (mm) 100 90 80 70 60
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using the cycle jump method, more t
Page 110 and 111: Chapter 5 Face/Core Interface Fatig
Page 112 and 113: of this chapter, sandwich panels wi
Page 114 and 115: H250 Specimen H100 Specimen H45 Spe
Page 116 and 117: Figure 5.5: Test setup. Initially,
Page 118 and 119: H100 Specimen Fibre bridging Figure
Page 120 and 121: propagation, the crack continues to
Page 122 and 123: Figure 5.14: Kinking of the crack i
Page 124 and 125: Crack length [mm] Crack length [mm]
Page 126 and 127: mode-mixity phase angle was chosen
Page 128 and 129: should be taken into account for a
Page 130 and 131: Figure 5.25: Kinking of the crack i
Page 132 and 133: log (da/dN) (mm/cycle) 10 log G (J/
Page 134 and 135: erroneous extrapolations in the tra
Page 136 and 137: compared to the 65% efficiency obta
Page 138 and 139: the case of uneven debond growth, t
Page 140 and 141: Load (kN) 2 1.5 1 0.5 0 Panel 1 Pan
Page 142 and 143: Figure 5.42: Zero and ninety degree
Page 144 and 145: G(J/m 2 ) 180 150 210 120 150 100 5
Page 146 and 147: 110 q=qG=0.4 Test #1 100 Test #2 Te
Page 148 and 149: panels were determined for differen
Page 150 and 151: Chapter 6 Conclusion and Future Wor
Page 152 and 153: toughness using MMB fracture toughn
Page 154 and 155: For the specimens with H250 core th
Page 156 and 157: Development of testing methods for
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Page 162 and 163: Kanny K. and Mahfuz H. (2005), Flex
Page 164 and 165: Ratcliffe J. and Cantwell W. J. (20
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Page 168 and 169: Out-of-plane displacement (mm) 1 0.
Page 170 and 171: Out-of-plane displacement (mm) 3 2
Page 172 and 173: A.5 Out-of-plane deflection of Debo
Page 174 and 175: (a) Figure A.14: Out-of-plane defle
Page 176 and 177: (a) (b) Figure A.18: Out-of-plane d
Page 178 and 179: Load (kN) 250 200 150 100 50 250 30
Page 180 and 181: Displacement (mm) 4 3 2 1 0 8 9 (a)
Page 182 and 183: (a) (b) Figure B.11: Out-of-plane d
Page 184 and 185: (a) (b) Figure B.15: Out-of-plane d
Page 188: DTU Mechanical Engineering Section
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