Mechanical Characterization of Sandwich Composite Structure using a New Experimental Approach

Abstract

In marine construction, ship hulls are subjected to high fatigue stresses due to the impact of waves and their cyclic solicitations. However, fatigue behaviour evaluation of the constitutive materials of hull is based on standard tests. The objective of this study is to take a critical view on the current standard test method set to investigate the fatigue life of cellular foam core material as used in high performance sandwich materials. The highlight of this study is to develop a new geometry of specimen in order to achieve coherence between the actual fatigue life time of the real structure and the one of specimens tested in a controlled laboratory environment. The tested specimen is made out of a high-density foam core and thin glass fabric faces. Moreover, a new test rig of different flexure types, in quasi-static or fatigue loadings on sandwich specimens, was developed and validated.

Determination of Paris parameters from S−N curve in the simulation of fatigue in Nomex honeycomb sandwich structures

“…Based on the literature excerpts, particularly related to sandwich materials [58][59][60], this study is focused on the prediction of Paris law parameters from the S−N curve of a honeycomb sandwich composite structure for which a finite element analysis (FEA) based numerical approach has been proposed thereby. Four-point bending end notched flexural (4ENF) specimen has been taken into consideration employing the VCCT in Abaqus ® for the evaluation of SERR which ultimately leads to the determination of Paris law parameters (C and m).…”

Experimental investigation of the compressive strength of hybrid composite sandwich beams with double-corrugated sinusoidal core reinforced by graphene and polyurethane foam

“…1–3 Hence, they have been widely used in many industries such as aerospace, automotive, marine, building, and defense. 4–6…”

Experimental and statistical investigation of the three-point bending strength of the composite sandwich beams with trapezoidal core

“…To improve the mechanical properties of sheet composite structures, especially to increase flexural strength and shear stress, sandwich structures have been introduced, which consist of two plates as top and bottom faces and a core that is enclosed between the faces. 6,7…”

“…To improve the mechanical properties of sheet composite structures, especially to increase flexural strength and shear stress, sandwich structures have been introduced, which consist of two plates as top and bottom faces and a core that is enclosed between the faces. 6,7 The use of sandwich beams in new industries has expanded widely in recent years, especially in structures such as ships, aircraft fuselage, cars, and bridges due to their superior static and dynamic resistance despite being lightweight [8][9][10] . Sandwich structures are formed by bonding top and bottom face sheets onto a lower-performance core.…”