Effect of specimen width on strength in off-axis compression tests
Paper in proceedings, 2016
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.