Topic
Sandwich-structured composite
About: Sandwich-structured composite is a research topic. Over the lifetime, 5853 publications have been published within this topic receiving 101126 citations.
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TL;DR: In this paper, Sandwich panels were fabricated with nanoclay-filled polyurethane foams and glass fiber-reinforced polyamide and polypropylenes face sheets.
Abstract: Sandwich panels were fabricated with nanoclay-filled polyurethane foams and glass fiber-reinforced polyamide and polypropylenes face sheets. Nanoclay-filled foam cores, with organophilic montmorill...
33 citations
TL;DR: In this paper, the development and the optimization of a thermoforming process (compression molding) for thermoplastic sandwich panels are reported. But the authors focus on the use of two different types of core material, a PP foam and a PP honeycomb.
Abstract: This paper reports on the development and the optimization of a thermoforming process (compression molding) for thermoplastic sandwich panels. The skins of the panels are fabricated from polypropylene (PP)/continuous glass fibers dry prepregs in the form of a commingled fabric. The use of two different types of core material has been used, a PP foam and a PP honeycomb. Additionally, two alternative methods for the thermoforming process have been analyzed, using either a one-stage or a two-stage process. In the one-step process, skin molding and skin-core bonding are carried out simultaneously. In the two-stage process, the skins are first thermoformed and then bonded to the core as the second stage. The influence of the selected process parameters on the mechanical properties of the panels has been experimentally investigated, leading to the identification of the preferred processing conditions. Polym. Compos. 25:307–318, 2004. © 2004 Society of Plastics Engineers.
33 citations
TL;DR: In this paper, the transition from face wrinkling failure to face sheet compression failure, induced by local buckling at fibre level, so called face sheet microbuckling, was investigated on small sandwich panels subjected to uni-axial compression.
Abstract: This paper investigates the transition from face wrinkling failure to face sheet compression failure, the latter induced by local buckling at fibre level, so called face sheet microbuckling. An experimental series is performed on small sandwich panels subjected to uni-axial compression. Two different face sheet lay-ups are used in conjunction with a range of PVC core material densities. The results are compared to analytical wrinkling formulae and the correlation is found to be very good. The experimental results also clearly show the transition from wrinkling failure to face sheet microbuckling failure when the core modulus exceeds a certain value. The localised failure surfaces are inspected by microscope and some different characteristics of the failure modes are indicated.
33 citations
TL;DR: In this paper, the geometric characteristics of a Miura-ori patterned sheet were examined and the quasi-static out-of-plane compression behavior of both the patterned sheets and their corresponding sandwich panels was investigated experimentally and numerically by using finite element analysis (FEA).
33 citations
Patent•
07 Oct 1988
TL;DR: The composite structural panel has bottom, top and edge layers which enclose a primary core (30), which provides additional structural strength to the panel as mentioned in this paper, and the structure is lightweight and resists deformation of the panel edge when the panel is cured under elevated pressure in an autoclave.
Abstract: The composite structural panel has
bottom (24), top (26) and edge layers (28) which enclose a primary
core (30). The core provides additional structural
strength to the panel. The edge layer (28) forms a
desired panel edge angle of approximately 20° to
45°. The primary core (36) is trimmed at an angle (46) of
approximately one-half the desired edge angle to
form a first pressure reaction surface (48). A
peripheral core (56) is positioned on the tapered
portion of the primary core (36) so that the axis of the
peripheral core (56) is perpendicular to the first
pressure reaction surface (48). The peripheral core is
trimmed to form a second pressure reaction surface (62)
beneath the edge of the panel. The structure is
lightweight and resists deformation of the panel
edge when the panel is cured under elevated
pressure in an autoclave.
33 citations