The effects of laminate lay-up and multiaxial loading on the failure of multidirectional laminates can be significant. Thus, ply thickness and fibre orientation effects in quasi-isotropic carbon/epoxy laminates subjected to combined tension-shear and compression-shear loading are investigated. Three laminate lay-ups with equivalent thickness and homogenised elastic properties, but with different ply thicknesses and ply orientation angles were studied using open-hole specimens. Combined tension/compression-shear loading was applied using a new Modified Arcan Fixture (MAF). A methodology for identifying the failure behaviour based on stereo Digital Image Correlation (DIC) is devised. The results showed that ply thickness has a strong effect on the failure behaviour in combined tension-shear, whereas the effect is small in compression-shear loading. No significant effect of the relative fibre orientation angles was observed under either loading regime. The experimental approach provides a new tool to investigate composite laminates under the full tension/compression-shear loading regime.

层压板的叠层和多轴载荷对多向层压板的破坏影响可能很大。因此，研究了在经受拉伸-剪切和压缩-剪切组合载荷作用的准各向同性碳/环氧树脂层压板中的层厚度和纤维取向效应。使用裸眼样品研究了三种具有相同厚度和均质弹性特性，但具有不同层厚度和层定向角的层压板。使用新的改良型Arcan治具（MAF）施加拉伸/压缩-剪切组合载荷。设计了一种基于立体数字图像相关性（DIC）识别故障行为的方法。结果表明，层板厚度对组合拉伸剪切的破坏行为有很大的影响，而在压缩剪切载荷下影响较小。在两种加载方式下均未观察到相对纤维取向角的显着影响。实验方法为研究复合材料层合板在全拉伸/压缩-剪切载荷条件下提供了一种新工具。