| 1. |
- Iftimiciuc, Mihaela, et al.
(author)
-
Structural Performance Analysis of a Novel Pyramidal Cellular Core Obtained through a Mechanical Expansion Process
- 2020
-
In: Materials. - : MDPI. - 1996-1944. ; 13:19
-
Journal article (peer-reviewed)abstract
- Stiff and strong yet lightweight cellular structures have become widely designed and used as cores for the construction of sandwich panels to reach high stiffness and strength to weight ratios. A low-density pyramidal cellular core has been proposed for investigation in this work. The novel core is manufactured from stainless steel sheet type 304 through a mechanical expansion procedure which is described in detail. The out-of-plane stiffness and strength performance is estimated by an analytical model which is successfully validated through experimental tests. A comparative study with other existing cellular core configurations made from other materials indicates an average performance behavior for the investigated structure. However, potential for a further structural performance increase is observed and discussed.
|
|
| 2. |
- Schneider, Christof, et al.
(author)
-
Compression properties of novel thermoplastic carbon fibre and poly-ethylene terephthalate fibre composite lattice structures
- 2015
-
In: Materials & Design. - : Elsevier. - 0261-3069. ; 65, s. 1110-1120
-
Journal article (peer-reviewed)abstract
- A novel manufacturing route to efficiently produce fibre composite lattice structures has been developed. By using thermoplastic composite materials, flat sheets have been continuously folded, cut into a lattice shape and joined into a sandwich structure. Carbon fibre reinforced poly-ethylene terephthalate (CPET) and poly-ethylene terephthalate fibre reinforced poly-ethylene terephthalate (SrPET) materials have been used to explore two different core options; a carbon fibre option which gives high performance but low recyclability and a single polymer PET option which gives lower performance but full recyclability. Parametric numerical simulations have been used to investigate how the various manufacturing parameters affect the mechanical performance of the core. The carbon fibre composite cores have mechanical performance on-par or better than existing metallic and composite lattice cores presented in literature. Single polymer PET cores show better performance compared to high-end foam cores but have considerable lower performance than carbon fibre lattice cores.
|
|
| 3. |
- Velea, Marian Nicolae, et al.
(author)
-
Second order hierarchical sandwich structure made of self-reinforced polymers by means of a continuous folding process
- 2016
-
In: Materials & design. - : Elsevier Ltd. - 0264-1275 .- 1873-4197. ; 102, s. 313-320
-
Journal article (peer-reviewed)abstract
- One typical way to obtain higher stiffness and strength to weight ratios within structural applications is to use sandwich structures containing lightweight cellular cores. In this study a novel second order hierarchical sandwich structure and its manufacturing principle are described. The whole hierarchical structure is made of a fully recyclable material - different forms of poly-ethylene terephthalate (PET): PET matrix, reinforced with PET fibres (Self reinforced - SrPET) and PET foam resulting in a recyclable structure. The manufacturing path is developed such that it can be implemented within a continuous production line. Out-of-plane compression test are carried out in order to determine the stiffness and strength properties of the proposed structure. An analytical model is developed for evaluating the out-of-plane stiffness and strength properties and used for investigating the influence of the geometric parameters on the structural performance of the proposed hierarchical sandwich structure
|
|
