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Development of a test method for evaluating the crushing behaviour of unidirectional laminates
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
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2017 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 51, no 29, p. 4041-4051Article in journal (Refereed) Published
Abstract [en]

More fundamental test methods are needed to assist the development of physically based and truly predictive simulation tools for composite materials under crash conditions. In this paper, a unidirectional flat specimen that can be used to validate the predicted behaviour from a simulation to the physical behaviour in the experiment is developed. A systematic experimental investigation is conducted to evaluate the influence of the trigger geometry on the crushing response by selecting two trigger types and different trigger angles. For longitudinal crushing, the traditional bevel trigger leads to out-of-plane failure by splaying with a limited amount of in-plane fracture, while the proposed trigger achieves a high amount of compressive fragmentation failure. For transverse crushing, the symmetry of the proposed new trigger improves the specimen stability during the crushing process. It is also observed that the weft threads of the unidirectional fabric reinforcement used for the tests have a strong influence on the longitudinal crushing response. The boundary conditions of the test and the information on the specimen failure gleaned from video recordings and microscopic inspections are discussed in order to facilitate a future correlation with modelling results.

Place, publisher, year, edition, pages
SAGE Publications Ltd , 2017. Vol. 51, no 29, p. 4041-4051
Keywords [en]
Crushing, fractography, mechanical testing, non-crimp fabric composite, Fracture, Fracture mechanics, Video recording, Experimental investigations, Flat specimen, Non-crimp fabric composites, Out-of-plane failures, Physically based, Predictive simulations, Trigger angle, Unidirectional fabrics
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-227134DOI: 10.1177/0021998317697811Scopus ID: 2-s2.0-85037057642OAI: oai:DiVA.org:kth-227134DiVA, id: diva2:1203520
Note

QC 20180503

Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2018-05-03Bibliographically approved

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CiteExportLink to record
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  • apa
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