|
|
||
|
|
|
|
Figure 1. Schematic illustration of a hybrid polymer foam/corrugated composite core sandwich panel utilizing 3D woven E-glass fiber textile to create the core struts and S2-glass for the face sheets. When subjected to bending, the face sheets and core struts are loaded in either in-plane tension or compression. The focus of this study is to investigate the core strut and face sheet when subjected to this loading.
This and the next image are from:
Adam J Malcom1, Mark T Aronson2, Haydn NG Wadley3
1Department of Mechanical Engineering, University of Virginia, USA
2DuPont Spruance Plant, New Fibers Group, USA
3Department of Materials Science and Engineering, University of Virginia, USA
“Three-dimensionally woven glass fiber composite struts: Characterization and mechanical response in tension and compression”, Journal of Composite Materials, Vol. 50, No. 1, pp 25-43, January 2016, https://doi.org/10.1177/0021998315569751
ABSTRACT: Three-dimensionally woven E- and S2-glass fiber textiles have been used in the past to create delamination-resistant corrugated core sandwich panels. During subsequent out-of-plane loading, the E-glass composite core struts and S2-glass composite faces are subjected to either compressive or tension loads. This study has investigated the relationships between the three-dimensional fiber architecture, fiber properties and the mechanical response of representative samples of the core and faces. Using X-ray computed tomography and optical microscopy to characterize the three-dimensional fiber architectures, it is found that the in-plane warp and weft fibers suffer significant off-axis displacement (waviness) due to their interaction with through thickness z-fiber tows. The consequence of this fiber waviness on the relationships of the in-plane tensile and compressive mechanical properties, along with fiber type, fiber volume fraction, and strut aspect ratio are experimentally investigated. The large initial misalignment angle of the warp and weft fiber tows results in a strut compressive strength that is substantially lower than its tensile strength due to compressive failure by either elastic or localized fiber microbuckling. Simple micromechanical models are used to relate the compressive strength of the three-dimensional woven composite struts to strut aspect ratio, fiber volume fractions in the three directions and the three-dimensional fiber architecture.
Page 121 / 180