Complex wing spar design in carbon fiber reinforced composite for a light aerobatic aircraft

Abstract

-The challenge concerns the realization of the lightest composite wing for E-FAN prototype 1.0 aircraft. This wing must be dismantled and must support critical loads for aerobatics. The bonding conception between the composites parts must transfer the high loads. This article presents a methodology to design a multi-materials structure with a complex geometry of varying thickness. So, the mechanical behavior must be known for the structure, as well as their weaknesses which can involve the rupture. For that, numerical simulations are elaborated in taken into account the constraints inherent in the manufacturing processes and DGAC's requirements (Direction Générale de l'Aviation Civile, French Authorities for Civil Aviation). The predictive character of these models is realized by numerical and experimental results correlations in order to optimize the numerical model accuracy. Indeed, the complete spar's sizing is validated by static rupture tests. This last point requires the building of a special testing equipment which is able to generate a load compared to the one applied in flight. Moreover, the testing metrology is used to quantify the accuracy level of models. Wing spar, central spar and central/wing bonding are qualified by DGAC for flight.

Composite wing structure of light amphibious airplane design, optimization, and experimental testing

“…The original design emphasized the strength of the spar, which was made mainly from carbon fiber to support major bending and twisting loads. The number of plies for the spar was assumed to be 16, 20, or 24 layers in cases A, B, and C, respectively ( Fleuret et al., 2016 ). All wing ribs in an airfoil shape that support the twisting load were modeled to be four and six layers of carbon fiber and glass fiber with a foam core in the middle, denoted as cases I and II, respectively.…”

The preparation of ultrathin and porous electrospinning membranes of HKUST-1/PLA with good antibacterial and filtration performances

“…The electrospinning fiber membranes in filtration application have attracted considerable attention due to their small diameter, high surfaceto-volume ratio, small inter-fiber pore sizes, low-cost and relatively high production rate [4][5][6][7][8][9][10][11], etc. By incorporating appropriate polymers with functional materials, degradable filter membranes can be prepared to solve the environmental problems caused by common non-degradable filter materials, and at the same time, the membranes can be endowed with functions such as antibacterial properties [12][13][14].…”

Improving adhesive behavior of fiber reinforced composites by incorporating electrospun Polyamide-6,6 nanofibers in joining region

“…For example, connecting small composite spars into large composite wings requires secondary bonding techniques. 7,8 Specifically, small parts are often produced using woven (twill) prepreg fabrics, while large ones are produced preferably with unidirectional (UD) prepregs. Therefore, secondary bonding of woven and UD composite parts is common in many aerospace applications.…”