Residual Strength and Fatigue Lifetime of ... - Solid Mechanics
Residual Strength and Fatigue Lifetime of ... - Solid Mechanics Residual Strength and Fatigue Lifetime of ... - Solid Mechanics
5 Face/core Interface Fatigue Crack Propagation in Sandwich Structures 88 5.1 Background …………………………………………………………………. 88 5.2 Face/Core Fatigue Crack Growth in Sandwich X-Joints …………………… 90 5.2.1 Experimental Study of the STT Specimens …………………………….. 91 5.2.2 Fatigue Characterization of the Face/Core Interface …………………… 102 5.2.3 Finite Element Modeling of the STT Specimen ……………………….. 110 5.3 Fatigue Crack Growth in the Face/Core Interface of Sandwich Panels ……. 114 5.3.1 Fatigue Experiments on Sandwich Panels ……………………………… 114 5.3.2 Finite Element Modeling of the Debonded Panels ……………………... 120 5.4 Conclusion …………………………………………………………………. 124 6 Conclusions and Future Work 128 6.1 Buckling Driven Face/Core Debond Propagation in Sandwich Structures … 128 6.2 Fatigue Crack Growth in Bimaterial Interfaces …………………………….. 130 6.3 Face/Core Interface Fatigue Crack Growth in Sandwich Structures ……….. 131 6.4 Future Works ……………………………………………………………….. 133 References 137 A Additional Results from the Column Compression Tests 145 A.1 Debonded Columns with H45 Core ……………………………………………. 145 xii
A.2 Debonded Columns with H100 Core …………………………………………. 146 A.3 Debonded Columns with H200 Core …………………………………………. 147 A.4 Initial Imperfections in Debonded Columns …………………………………. 148 A.5 Out-of-plane deflection of Debonded Columns ………………………………. 150 B Additional Results from the Panel Compression Tests 155 B.1 Load vs. In-plane Displacement Curves ………………………………………. 155 B.2 Out-of-plane Deflection vs. Load Curves ……………………………………. 157 B.3 Out-of-plane Deflection of the Debonded Panels ……………………………. 159 C Additional Results from the Tests on the STT Specimens 163 B.1 Axial Displacement vs. Force Curves from the Static Tests …………………. 163 xiii
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- Page 14 and 15: Contents Preface Executive Summary
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5 Face/core Interface <strong>Fatigue</strong> Crack Propagation in S<strong>and</strong>wich Structures 88<br />
5.1 Background …………………………………………………………………. 88<br />
5.2 Face/Core <strong>Fatigue</strong> Crack Growth in S<strong>and</strong>wich X-Joints …………………… 90<br />
5.2.1 Experimental Study <strong>of</strong> the STT Specimens …………………………….. 91<br />
5.2.2 <strong>Fatigue</strong> Characterization <strong>of</strong> the Face/Core Interface …………………… 102<br />
5.2.3 Finite Element Modeling <strong>of</strong> the STT Specimen ……………………….. 110<br />
5.3 <strong>Fatigue</strong> Crack Growth in the Face/Core Interface <strong>of</strong> S<strong>and</strong>wich Panels ……. 114<br />
5.3.1 <strong>Fatigue</strong> Experiments on S<strong>and</strong>wich Panels ……………………………… 114<br />
5.3.2 Finite Element Modeling <strong>of</strong> the Debonded Panels ……………………... 120<br />
5.4 Conclusion …………………………………………………………………. 124<br />
6 Conclusions <strong>and</strong> Future Work 128<br />
6.1 Buckling Driven Face/Core Debond Propagation in S<strong>and</strong>wich Structures … 128<br />
6.2 <strong>Fatigue</strong> Crack Growth in Bimaterial Interfaces …………………………….. 130<br />
6.3 Face/Core Interface <strong>Fatigue</strong> Crack Growth in S<strong>and</strong>wich Structures ……….. 131<br />
6.4 Future Works ……………………………………………………………….. 133<br />
References 137<br />
A Additional Results from the Column Compression Tests 145<br />
A.1 Debonded Columns with H45 Core ……………………………………………. 145<br />
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