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

More documents

Recommendations

Info

Residual Strength and Fatigue Lifetime of Debond Damaged Sandwich Structures Ramin Moslemian TECHNICAL UNIVERSITY OF DENMARK DEPARTMENT OF MECHANICAL ENGINEEING SECTION OF COASTAL, MARITIME AND STRUCTURAL ENGINEERING SEPTEMBER 2011
Page 1: Residual Strength and Fatigue Lifet
Page 5 and 6: Preface This thesis is submitted as
Page 7 and 8: Executive Summary Sandwich composit
Page 9 and 10: This page is intentionally left bla
Page 11 and 12: eksperimenterne. Dette ses som et t
Page 13 and 14: Publications [P1] R. Moslemian, C.
Page 15 and 16: 2.3 Experimental Results ………
Page 17 and 18: A.2 Debonded Columns with H100 Core
Page 19 and 20: Symbols Roman Symbols A extensional
Page 21 and 22: oscillatory index ratio between co
Page 23 and 24: Chapter 1 Introduction 1.1 Backgrou
Page 25 and 26: toughness of the interface at diffe
Page 27 and 28: These numerical and experimental st
Page 29 and 30: 1.4 Linear Elastic Fracture Mechani
Page 31 and 32: (1.17) where h is the characterist
Page 33 and 34: Figure 1.8: Typical fatigue crack g
Page 35 and 36: sandwich Double Cantilever Beam (DC
Page 37 and 38: This page is intentionally left bla
Page 39 and 40: ate, phase angle and debond propaga
Page 41 and 42: Figure 2.2: (a) Schematic represent
Page 43 and 44: (a) (b) Figure 2.5: Initial imperfe
Page 45 and 46: the TSD specimen. The measured frac
Page 47 and 48: Figure 2.10: Schematic presentation
Page 49 and 50: tilted 60. The bottom core surface
Page 51 and 52: (a) (b) Figure 2.15: Crack propagat
Page 53 and 54:
Figure 2.17: Finite element models.
Page 55 and 56:
Out-of-plane displacement (mm) 4 3
Page 57 and 58:
Figure 2.21 shows energy release ra
Page 59 and 60:
2.7 Conclusion The first step in a
Page 61 and 62:
Chapter 3 Failure of Uniformly Comp
Page 63 and 64:
Type A: Three layers of DBLT-850 qu
Page 65 and 66:
the lowest values being for the Typ
Page 67 and 68:
is the elastic foundation modulus p
Page 69 and 70:
Figure 3.5 shows the face/core debo
Page 71 and 72:
Figure 3.8: Crack path for an MMB s
Page 73 and 74:
(a) (b) Figure 3.12: Out-of-plane d
Page 75 and 76:
(3.15) cr 0. 5 3 E f EcGc where Ef
Page 77 and 78:
3.6: Numerical and experimental buc
Page 79 and 80:
fracture toughness of the H250 core
Page 81 and 82:
(a) (b) 3.21: (a) Energy release ra
Page 83 and 84:
To examine the effect of initial im
Page 85 and 86:
Chapter 4 Fatigue Crack Growth Simu
Page 87 and 88:
4.2 The Cycle Jump Method In struct
Page 89 and 90:
S23( t3 ) t y, jump q yt cyc (4.5
Page 91 and 92:
Figure 4.3: Finite element model of
Page 93 and 94:
(a) (b) Figure 4.6: Deflection of t
Page 95 and 96:
analysis. A larger N shows increase
Page 97 and 98:
elease rate and mode-mixity phase a
Page 99 and 100:
Figure 4.12: Orthogonal mesh at the
Page 101 and 102:
in Table (4.1). The debonded panels
Page 103 and 104:
growth descreases as the 90-degree
Page 105 and 106:
As described before in Equations (4
Page 107 and 108:
4.5 Conclusion A cycle jump method
Page 109 and 110:
This page is intentionally left bla
Page 111 and 112:
damaged sandwich composites subject
Page 113 and 114:
5.2.1 Experimental Study of the STT
Page 115 and 116:
(a) (b) Figure 5.3: Drawing of the
Page 117 and 118:
Crack growth paths for the STT spec
Page 119 and 120:
H250 Specimen Fibre bridging Figure
Page 121 and 122:
H100 Specimen Figure 5.12: Crack gr
Page 123 and 124:
around 150 mm. After the unstable c
Page 125 and 126:
Since the observed large-scale fibr
Page 127 and 128:
Displacement controlled static test
Page 129 and 130:
clamped approximately 5-10 mm from
Page 131 and 132:
Figure 5.27: Fatigue crack growth p
Page 133 and 134:
An accelerated simulation of fatigu
Page 135 and 136:
not valid for unstable crack growth
Page 137 and 138:
Figure 5.34: Drawing of debonded sa
Page 139 and 140:
Steel plates and clamps Figure 5.37
Page 141 and 142:
kinks into the core because of very
Page 143 and 144:
generated. Symmetry boundary condit
Page 145 and 146:
insensitivity of the mode-mixity to
Page 147 and 148:
Sandwich Tear Test (STT) specimens
Page 149 and 150:
This page is intentionally left bla
Page 151 and 152:
due to the proximity of the debond
Page 153 and 154:
Fatigue debond propagation in sandw
Page 155 and 156:
control parameters. Simulations of
Page 157 and 158:
As an alternative approach to model
Page 159 and 160:
References Avery J. L., and Sankar
Page 161 and 162:
Cognard J. Y., Ladeveze P. and Talb
Page 163 and 164:
Maziere M. and Fedelich, B. (2010),
Page 165 and 166:
Suo, Z. (1990), Singularities, Inte
Page 167 and 168:
Appendix A Additional Results from
Page 169 and 170:
Out-of-plane displacement (mm) 3 2
Page 171 and 172:
(a) (b) (c) Figure A.8: Initial imp
Page 173 and 174:
(a) Figure A.12: Out-of-plane defle
Page 175 and 176:
(a) Figure A.16: Out-of-plane defle
Page 177 and 178:
Appendix B Additional Results from
Page 179 and 180:
B.2 Out-of-plane Deflection vs. Loa
Page 181 and 182:
(a) (b) Figure B.9: Out-of-plane de
Page 183 and 184:
(a) (b) Figure B.13: Out-of-plane d
Page 185:
Appendix C Additional Results from
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?