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Experimental and numerical study of the spring-in of angled brackets manufactured using different resins and fiber textiles

Bernath, Alexander; Groh, F.; Exner, W.; Hühne, C.; Henning, Frank

Abstract:
Process-induced distortion of composite structures often leads to a violation of tolerances, making the assembly of components difficult and expensive. It therefore can inhibit a cost-effective mass production of high-performance composite structures. Process-induced distortion is often introduced by curved regions of a part due to spring-in. Main drivers are chemical shrinkage of the resin and thermal expansion of both fiber and resin during cooling after demolding. Both contribute to residual strains and consequently lead to distortion of the manufactured part. The spring-in phenomenon has been already addressed in many studies. However, variations in manufacturing and specimen properties inhibit a detailed comparison of the results. Hence, it is difficult to isolate major influencing parameters. Here we show spring-in results of specimens that were manufactured using the very same experimental setup and laminate configuration but different resin and fiber types. It is therefore possible to identify the interaction of the curing temperature and the maximum achievable glass transition temperature of the individual resins as a major influencing factor. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000096398
Veröffentlicht am 30.07.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Fahrzeugsystemtechnik (FAST)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0021-9983, 1530-793X
KITopen-ID: 1000096398
Erschienen in Journal of composite materials
Schlagworte Process-induced distortion, spring-in, angled bracket, chemical shrinkage, thermal expansion, residual strain, spring-in prediction
Nachgewiesen in Scopus
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