 | Stefaniak D. Improving residual strenght of unidirectionally reiforced plastic laminates by metal layering: Diss. … Dr.-Ing. / Deutsches Zentrum für Luft- und Raumfahrt, Institut für Faserverbundleichtbau und Adaptronik, Braunschweig. - Köln: DLR, 2017. - xiv, 193 p.: ill., tab. - (Forschungsbericht; 2017-45). - Res. also Germ. - Bibliogr.: p.159-169. - ISSN 1434-8454
Шифр: (Pr 1120/2017-45) 02
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Notations ...................................................... ix
List of symbols - latin letters ................................ ix
List of symbols - greek letters ................................ xi
List of abbreviations ........................................ xiii
1 Introduction ................................................. 1
1.1 Background .............................................. 1
1.2 Objective ............................................... 2
2 Approach, hypotheses and outline .......................... 3
2.1 UD-CFRP-steel approach .................................. 3
2.2 Methodical hypotheses ................................... 4
2.3 Outline ................................................. 6
3 Damage tolerance as critical design parameter ................ 7
3.1 Literature review ....................................... 7
3.2 Present chapter's structure ............................ 10
3.3 Effect of damage tolerance on laminate design .......... 11
3.4 Consideration of unidirectional properties ............. 15
3.5 Consideration of bidirectional properties - method ..... 25
3.6 Consideration of bidirectional properties - parameter
study .................................................. 28
3.7 Discussion of hypotheses addressed ..................... 44
4 Constituent interfaces ...................................... 45
4.1 Literature review ...................................... 45
4.2 Present copter's structure ............................. 50
4.3 Interlaminar shear strength and its determination ...... 51
4.4 Development of a vacuum blasting process for foils ..... 61
4.5 Applied surface treatments ............................. 63
4.6 Results and discussion ................................. 67
4.7 D.scussion of hypothesis addressed ..................... 73
5 Process-induced residual stress ............................. 75
5.1 Literature review ...................................... 75
5.2 Present chapter's structure ............................ 77
5.3 Intra- and interlaminar stress state ................... 78
5.4 Ply interaction and influencing parameters ............. 85
5.5 Evaluation of residual stress .......................... 88
5.6 Residual curing stress and its modification ............ 91
5.7 Discussion of hypothesis addressed ..................... 97
6 Experimental evaluation of residual strength ................ 99
6.1 Literature review ...................................... 99
6.2 Present chapter's structure ........................... 101
6.3 Sample manufacturing .................................. 102
6.4 Testing compression strength and modulus .............. 103
6.5 Failure evaluation .................................... 105
6.6 CAI testing and modified impact test procedure ........ 1ll
6.7 Lay-ups and results ................................... 114
6.8 Discussion of hypotheses addressed .................... 143
7 Conclusions and outlook .................................... 145
List of Figures ............................................... 152
List of Tables ................................................ 154
Appendix ...................................................... 171
A Simplified shear solution by Bednarcyk et al. .............. 171
В Failure geometries - CFRP-UD-steel CT plots ................ 173
Bibliography .................................................. 171
Own publications .............................................. 189
Curriculum Vitae .............................................. 193
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