3D Printing of Composite Sandwich Structures for Aerospace Applications

2021 ◽  
pp. 45-73
Author(s):  
Chetan J. Choudhari ◽  
Prafull S. Thakare ◽  
Santosh Kumar Sahu
Keyword(s):  
3D Printing ◽  
Sandwich Structures ◽  
Composite Sandwich ◽  
Aerospace Applications ◽  
Composite Sandwich Structures

An optimization of composite sandwich structure with passive vibration absorber for vibration suppression

2020 ◽  
pp. 109963622094291
Author(s):  
Yongha Kim ◽  
Jungsun Park
Keyword(s):  
Computational Efficiency ◽  
Sandwich Structure ◽  
Vibration Suppression ◽  
Sandwich Structures ◽  
Ritz Method ◽  
Vibration Absorber ◽  
Composite Sandwich ◽  
Aerospace Applications ◽  
Composite Sandwich Structures ◽  
Approximate Formulation

This article proposes the use of a support as a passive vibration absorber to a composite sandwich structure for vibration suppression of satellite structures. Based on continuous mass distributions, an approximate formulation is presented for conducting vibration (modal, frequency response) analyses of the composite sandwich structure with the support. This formulation is derived by the Ritz method; verified for accuracy and computational efficiency by comparing finite element analyses. Finally, we perform optimization of the composite sandwich structure with passive vibration absorber by the present method. This optimization is conducted to applying satellite structures for maximizing vibration suppression performance in limited mass. The optimization result allows a database to be obtained on the vibration characteristics of composite sandwich structures with passive vibration absorber for applying aerospace applications. Consequently, it is concluded that the approximate formulation is well suited to vibration analyses of composite sandwich structures with passive vibration absorber due to their relative simplicity and computational efficiency.

Effects of core splice joint width on the performance of composite sandwich structures with honeycomb core: An experimental study

2021 ◽  
pp. 109963622110204
Author(s):  
William E Guin ◽  
Alan T Nettles
Keyword(s):  
Sandwich Structure ◽  
Large Scale ◽  
Sandwich Structures ◽  
Composite Sandwich ◽  
Aerospace Applications ◽  
Shear Loads ◽  
Composite Sandwich Structures ◽  
Honeycomb Sandwich ◽  
Joint Width ◽  
Mass Basis

Composite sandwich structures are commonly considered in large-scale aerospace applications due to their performance on a per mass basis. The nature of a large-scale sandwich structure generally necessitates the use of multiple sections of core to fill out the structural form. These core sections must be spliced together to ensure that shear loads are appropriately transmitted throughout the core. Because core installation in a large-scale component is a challenging operation, core splice joint width can be difficult to control in manufacturing. As such, the effects of core splice joint width on sandwich structure performance should be well understood. This study examines the effects of core splice joint width in honeycomb sandwich structures via mechanical testing and post-failure analysis. A threshold core splice joint width is shown to exist with respect to core shear, while the integrity of the facesheet-to-core interface is shown to degrade with increasing core splice joint width.

Role of 3D Printing in the Fabrication of Composite Sandwich Structures

2021 ◽  
pp. 349-375
Author(s):  
Athul Joseph ◽  
Vinyas Mahesh ◽  
Vishwas Mahesh ◽  
Dineshkumar Harursampath ◽  
Vasu Mallesha
Keyword(s):  
3D Printing ◽  
Sandwich Structures ◽  
Composite Sandwich ◽  
Composite Sandwich Structures

scholarly journals The energy absorption behavior of novel composite sandwich structures reinforced with trapezoidal latticed webs

2021 ◽  
Vol 60 (1) ◽  
pp. 503-518
Author(s):  
Juan Han ◽  
Lu Zhu ◽  
Hai Fang ◽  
Jian Wang ◽  
Peng Wu
Keyword(s):  
Bearing Capacity ◽  
Energy Absorption ◽  
Sandwich Structure ◽  
Ultimate Load ◽  
Sandwich Structures ◽  
Elastic Displacement ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Composite Sandwich ◽  
Composite Sandwich Structures

Abstract This article proposed an innovative composite sandwich structure reinforced with trapezoidal latticed webs with angles of 45°, 60° and 75°. Four specimens were conducted according to quasi-static compression methods to investigate the compressive behavior of the novel composite structures. The experimental results indicated that the specimen with 45° trapezoidal latticed webs showed the most excellent energy absorption ability, which was about 2.5 times of the structures with vertical latticed webs. Compared to the traditional composite sandwich structure, the elastic displacement and ultimate load-bearing capacity of the specimen with 45° trapezoidal latticed webs were increased by 624.1 and 439.8%, respectively. Numerical analysis of the composite sandwich structures was carried out by using a nonlinear explicit finite element (FE) software ANSYS/LS-DYNA. The influence of the thickness of face sheets, lattice webs and foam density on the elastic ultimate load-bearing capacity, the elastic displacement and initial stiffness was analyzed. This innovative composite bumper device for bridge pier protection against ship collision was simulated to verify its performance. The results showed that the peak impact force of the composite anti-collision device with 45° trapezoidal latticed webs would be reduced by 17.3%, and the time duration will be prolonged by about 31.1%.

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