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Effect of specimen width on strength in off-axis compression tests
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
RISE, Swerea, SICOMP.ORCID iD: 0000-0002-8463-7863
GKN Aerospace Sweden AB, Sweden.
2016 (English)In: ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials, European Conference on Composite Materials, ECCM , 2016Conference paper, Published paper (Refereed)
Abstract [en]

Compression tests have been performed according to ASTM D6641 to check whether 12 mm is a sufficient width for off-axis tests of a unidirectional Non Crimp Fabric (NCF) reinforced carbon-fibre composite. Various off-axis angles are tested in a larger context and it is important to establish a representative material volume. The test matrix consists of two different widths for two off-axis cases, 15° and 20° with a total sample size of 24. A two-sample T-test is performed for each off-axis angle to check if there is a statistically significant difference of the compressive strength between specimens with different widths. The null hypothesis, that there is no difference between the mean values is tested with a double-tailed test on a 5 % significance level. Neither of the cases may be rejected, i.e. there is no statistically significant difference on the 5 % level. The 15° off-axis case returns a p-value of 7.4 % and the 20° off-axis case gives a p-value of 21.3 %. It can be concluded that the effect is small and not statistically significant. It means that remaining off-axis testing in the larger context can proceed with the nominal width of 12 mm.

Place, publisher, year, edition, pages
European Conference on Composite Materials, ECCM , 2016.
Keywords [en]
ASTM D6641, Compression, NCF, Off-Axis, Strength, Carbon, Carbon fibers, Compaction, Composite materials, Compression testing, Carbon fibre composites, Off-axis compression tests, Significance levels, Statistically significant difference, Two sample t tests, Compressive strength
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42169Scopus ID: 2-s2.0-85018590072ISBN: 9783000533877 (print)OAI: oai:DiVA.org:ri-42169DiVA, id: diva2:1384278
Conference
17th European Conference on Composite Materials, ECCM 2016, 26 June 2016 through 30 June 2016
Note

 Funding details: VINNOVA; Funding details: 2013-01119; Funding text 1: This work is performed within the Swedish Aeronautical Research Program (NFFP), Project 2013-01119, jointly funded by the Swedish Armed Forces, Swedish Defence Materiel Administration and the Swedish Governmental Agency for Innovation Systems. Financial support from Vinnova, via LIGHTer SRA1 Modelling, is greatfully acknowledged. The Authors which to thank Peter Hellstr?m at Swerea Sicomp for his involvement in the testing.

Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-01-09Bibliographically approved

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Gutkin, Renaud

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