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 article, the authors present the main results of an experimental, theoretical and numerical investigation on the flexural behaviour and failure mode of composite sandwich panels primarily developed for marine applications, where the face sheets of the sandwich panels are made up of glass fibre reinforced polymer (GFRP), while polyvinylchloride (PVC) foam was used as core material.
Abstract: This study presents the main results of an experimental, theoretical and numerical investigation on the flexural behaviour and failure mode of composite sandwich panels primarily developed for marine applications. The face sheets of the sandwich panels are made up of glass fibre reinforced polymer (GFRP), while polyvinylchloride (PVC) foam was used as core material. Four-point bending test was carried out to investigate the flexural behaviour of the sandwich panel under quasi static load. The finite element (FE) analysis taking into account the cohesive nature of the skin-core interaction as well as the geometry and materials nonlinearity was performed, while a classical beam theory was used to estimate the flexural response. Although the FE results accurately represented the initial and post yield flexural response, the theoretical one restricted to the initial response of the sandwich panel due to the linearity assumptions. Core shear failure associate with skin-core debonding close to the loading points was the dominant failure mode observed experimentally and validated numerically and theoretically.
33 citations
TL;DR: In this article, a new composite structure was formed by filling Nomex honeycomb with polyester fiber to achieve the goal of improving its acoustic characteristics by using the impedance tube method.
33 citations
TL;DR: In this paper, the failure mechanisms of sandwich panels with multi-layered aluminum foam/UHMWPE laminate cores under combined blast and fragments loading were investigated, where the combined loading was generated by detonating a cylindrical TNT charge whose bottom face was attached with prefabricated fragments.
Abstract: This paper presents an experimental investigation into the failure mechanisms of sandwich panels with multi-layered aluminum foam/UHMWPE laminate cores under combined blast and fragments loading. The combined loading was generated by detonating a cylindrical TNT charge whose bottom face was attached with prefabricated fragments. Attention focused on the effects of UHMWPE laminate location, foam core gradation and refractory interlayer on the dynamic responses of the panels. Multiple failure patterns were observed on the panel components, including the perforations of front face, petalling or cracking of back face, plugging of foam core, scorching, fiber fracture and delamination of UHMWPE laminate, and debonding failure of adhesive. Results indicated that introducing the UHMWPE laminate was beneficial to alleviating the damage state of back face. The foam layers with graded density could further decrease the back face deflection, while the incorporation of a ceramic fiber felt would deteriorate the back face damage. As expected, the sandwich panels suffered much more destructive damage under combined loading than the ones under bare blast loading. The core configuration with the UHMWPE laminate located at the bottom layer was favored by the panels to possess a desirable capacity of comprehensive protection under combined loading and bare blast loading.
33 citations
Patent•
02 Dec 2003
TL;DR: In this article, a closed-cell foams are used as structural core materials in sandwich composites, which are amenable to vacuum-mediated resin bonding to composite skins to provide lightweight, high-strength structural sandwiches suitable for use in a variety of applications.
Abstract: High-strength, chemically and thermally stable, closed-cell foams, useful as structural core materials in sandwich composites. The core materials of the invention display anisotropic properties. The core materials of the invention are amenable to vacuum-mediated resin bonding to composite skins to provide lightweight, high-strength structural sandwiches suitable for use in a variety of applications, such as marine applications, construction, aviation, rapid transit, and recreational vehicles.
32 citations
Patent•
02 Jun 1970
TL;DR: In this paper, a threaded insert is affixed within a sandwich panel with a hardenable liquid adhesive which is forced into intimate contact with the body of the insert by helical ribs on the body which move the liquid adhesive during insertion into the panel and are engaged by the adhesive to anchor the insert upon hardening of the adhesive.
Abstract: A threaded insert is affixed within a sandwich panel with a hardenable liquid adhesive which is forced into intimate contact with the body of the insert by helical ribs on the body which move the liquid adhesive during insertion of the insert into the panel and are engaged by the adhesive to anchor the insert upon hardening of the adhesive. The body is a composite construction including a metallic threaded member surrounded by a sleeve of molded plastic which carries the helical ribs.
32 citations