In this work has been estimated the compressive strength of a unidirectional lamina of a
carbon/epoxy composite material, using the cross-ply and angle-ply laminates.
Over the years various methods have been developed to deduce compressive properties of composite materials
reinforced with long fibres. Each of these methods is characterized by a specific way of applying load to the
The method chosen to perform the compression tests is the Wyoming Combined Loading Compression (CLC)
Test Method, described in ASTM D 6641 / D 6641M-09. This method presents many advantages, especially:
the load application on the specimen (end load combined with shear load), the reproducibility of measurements
and the experimental equipment quite simplified.
Six different laminates were tested in compressive tests. They were realized by the same unidirectional prepreg,
but with different stacking sequences: two cross-ply [0/90]ns, two angle-ply [0/90/±45]ns and two
unidirectional laminates ns and ns.
The estimate of the compressive strength of the unidirectional laminates at 0°, was done by an indirect
analytical method, developed from the classical lamination theory, and which uses a multiplicative parameter
known as Back-out Factor (BF). The BF is determined by using the experimental values obtained from
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.
Open Access Statement
Frattura ed Integrità Strutturale (Fracture and Structural Integrity, F&SI) is an open access journal which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. This is in accordance with the BOAI definition of open access. F&SI operates under the Creative Commons Licence Attribution 4.0 International (CC-BY 4.0). This allows to copy and redistribute the material in any medium or format, to remix, transform and build upon the material for any purpose, even commercially, but giving appropriate credit and providing a link to the license and indicating if changes were made.