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Effect of specimen width on strength in off-axis compression tests

Dennis Wilhelmsson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Leif Asp (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Renaud Gutkin ; Fredrik Edgren
Proceedings of 17th European Conference on Composite Materials, ECCM17 (2016)
[Konferensbidrag, refereegranskat]

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.



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Denna post skapades 2016-11-17. Senast ändrad 2016-11-17.
CPL Pubid: 245302