Rohde-Tibitanzl | Direct Processing of Long Fiber Reinforced Thermoplastic Composites and their Mechanical Behavior under Static and Dynamic Load | E-Book | sack.de
E-Book

E-Book, Englisch, 218 Seiten

Rohde-Tibitanzl Direct Processing of Long Fiber Reinforced Thermoplastic Composites and their Mechanical Behavior under Static and Dynamic Load


1. Auflage 2015
ISBN: 978-1-56990-630-9
Verlag: Hanser Publications
Format: PDF
 Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 218 Seiten

ISBN: 978-1-56990-630-9
Verlag: Hanser Publications
Format: PDF
 Kopierschutz: 1 - PDF Watermark

The mechanical behavior of fiber reinforced thermoplastic composites is mainly influenced by fiber length. However, fiber length is strongly reduced during processing. For this reason direct processing techniques are increasingly applied in order to avoid fiber fracture and thus to generate composites with long fibers.

This work investigates the influence of fiber length especially on fatigue behavior of thermoplastic composites. The processing influences on fiber length of composites during injection molding compounding are thereby analyzed and quantified. It is thus shown how to directly influence fiber length in the composite.

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Autoren/Hrsg.

Rohde-Tibitanzl, Melanie

Weitere Infos & Material

1;PREFACE;6
2;TOC;7
3;1 INTRODUCTION;10
4;2 STATE OF THE ART;12
4.1;2.1 Processing of Long Fiber Reinforced Thermoplastic Composites (LFRT);12
4.2;2.2 General mechanisms of fiber length degradation during direct processing;14
4.3;2.3 Fiber length degradation during injection molding compounding;18
4.3.1;2.3.1 Fiber fracture in the compounding extruder;21
4.3.2;2.3.2 Fiber fracture due to the valves;31
4.3.3;2.3.3 Fiber fracture during melt buffering and injection;31
4.3.4;2.3.4 Fiber alignment and fiber fracture during cavity filling;32
4.4;2.4 Determination of Fiber Length;47
4.5;2.5 Static Properties of Fiber-Reinforced Thermoplastic Composites;50
4.5.1;2.5.1 Micromechanics under Static Load;50
4.5.2;2.5.2 Modeling of Static Properties;55
4.5.3;2.5.3 Influences on Static Properties of Fiber-Reinforced Thermoplastic Composites;60
4.6;2.6 Dynamic Properties of Fiber-Reinforced Thermoplastic Composites;65
4.6.1;2.6.1 Micromechanics under Dynamic Load;65
4.6.2;2.6.2 Measurement Methods for Fatigue;67
4.6.3;2.6.3 Influences on Dynamic Properties of Fiber-Reinforced Thermoplastic Composites;72
5;3 CONCLUSIONS FROM THE CURRENT STATE OF THE ART — MOTIVATION & AIM;78
6;4 EXPERIMENTAL: METHODS & MATERIALS;81
6.1;4.1 Aim: Processing Influences on Composite Properties in Injection Molding Compounding;81
6.1.1;4.1.1 Injection Molding Compounding & Injection Molding;81
6.1.2;4.1.2 Morphology Determination;85
6.2;4.2 Aim: Influences of Fiber Length on Static Properties;90
6.3;4.3 Aim: Influences of Fiber Length on Fatigue Properties;91
6.4;4.4 Materials;95
6.4.1;4.4.1 Matrix Systems;95
6.4.2;4.4.2 Glass Fibers;96
6.4.3;4.4.3 Coupling Agents;96
6.4.4;4.4.4 Manufactured Composites;97
7;5 INFLUENCES ON MATERIAL PROPERTIES IN DIRECT PROCESSING;98
7.1;5.1 Influence of Screw Setup and Fiber Inlet;99
7.2;5.2 Influence of Processing Parameters and Number of Rovings;110
7.3;5.3 Conclusion of Process Investigation: Fiber Length Degradation in the IMC;117
7.3.1;5.3.1 Fiber Fracture in the Compounding Extruder;117
7.3.2;5.3.2 Fiber Fracture during Melt Buffering and Injection;128
7.3.3;5.3.3 Fiber Fracture during Cavity Filling;129
7.4;5.4 Fiber Alignment during Cavity Filling;130
8;6 INFLUENCE OF FIBER LENGTH ON COMPOSITE PROPERTIES UNDER STATIC LOAD;140
8.1;6.1 Short Term Properties of Glass Fiber Reinforced Composites;140
8.2;6.2 Modelling of Fiber Length Influence on Short Term Properties;148
8.3;6.3 Micromechanical Phenomena under Static Load;162
8.4;6.4 Conclusions from the Previous Paragraphs;164
9;7 INFLUENCE OF FIBER LENGTH ON COMPOSITE PROPERTIES UNDER FATIGUE LOAD;165
9.1;7.1 Long Term Properties of Glass Fiber Reinforced Composites;165
9.2;7.2 Self-Heating of the Samples during Testing;177
9.3;7.3 Modelling of Fiber Length Influence on Long Term Properties;178
9.4;7.4 Micromechanical Phenomena under Dynamic Load;184
9.5;7.5 Conclusions from the Previous Paragraphs;189
9.6;7.6 S-N-Curves of Selected Composites;190
9.6.1;7.6.1 Residual Strength after Dynamic Testing;194
9.6.2;7.6.2 Conclusions from the Previous Paragraphs;195
10;8 FUTURE PERSPECTIVES: TRANSFER TO REALITY;196
11;9 DEUTSCHE ZUSAMMENFASSUNG;203
12;10 ABBREVIATIONS, EQUATIONS & INDICES;205
12.1;10.1 Abbreviation;205
12.2;10.2 Formula Symbols;205
12.3;10.3 Indices;207
13;11 LITERATURE;209
14;12 OWN PUBLICATIONS RELATED TO THIS THESIS;219
14.1;Curriculum Vitae;219

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