Experimental and Numerical Investigations of Thin-Walled Stringer-Stiffened Panels Welded with RFSSW Technology under Uniaxial Compression

Abstract

Many aircraft structures are thin walled and stringer-stiffened, and therefore, prone to a loss of stability. This paper deals with accurate and validated stability analysis of the model of aircraft skin under compressive loading. Both experimental and numerical analyzes are conducted. Two different methods of joining panel elements are considered. In the first case, the panel is fabricated using rivets. In the second variant, the refill friction stir spot welding technique is used. Both types of panels are loaded in axial compression in a uniaxial tensile testing machine. The geometrically and physically nonlinear finite element analyzes of the panels were carried out in ABAQUS/Standard. The Digital Image Correlation measurement system ARAMIS has been utilized to monitor the buckling behavior and failure mode in the skin-stringer interface of the stiffened panels. The results of experiments and the digital image correlation system are presented and compared to the numerical simulations.

Straight and Bent Bars Buckling Considered as the Axial Displacement of One Bar End

“…We can imagine a sinusoid as an expansion of an ellipse formed by an intersection of a cylinder by a plane at a certain angle to the axis and passing through the diameter of this cylinder (Fig. 3a) (Czechowski et al, 2020;Kubit et al, 2019). Half of the ellipse circumference is the sinusoid length.…”

“…Buckling is a classic mechanical problem, the concept of which was introduced by Euler (Euler, 1744). Over the years, buckling analysis has found wide application, including in civil engineering (Śledziewski & Górecki, 2020;Toledo et al, 2020), mechanical engineering (Czechowski et al, 2020;Kubit et al, 2019) or the maritime industry (Corigliano et al, 2019;Shen et al, 2020). Currently, there is a renewed interest in buckling, in particular in applications in composite structures (Rozylo et al, 2020;Schilling & Mittelstedt, 2020;Xu & Wu, 2008) or micro and nano technologies (Barretta et al, 2019;Chandra et al, 2020).…”

Influence of the Amplitude of Resonance Vibrations on Fatigue Life of a Compressor Blade with Simulated FOD Damage

“…It is particularly important to accurately and reliably determine the fatigue material data [12,13] and also to consider cyclic hardening [9] (in the case of fatigue tests) and correction of mean stresses [3,6]. The fatigue life results are also influenced by initial (residual) stresses and their concentration [5,7] around the critical points of the structure. The impact of the material itself and its resistance to cracking [10] on the fatigue life should not be overlooked.…”

Experimental and Numerical Studies of Low-Profile, Triangular Grid-Stiffened Plates Subjected to Shear Load in the Post-Critical States of Deformation

“…The main technique to join stiffening elements, such as stringers and ribs, to the skin is riveting, but the constant pursuit to lower the mass of the structure forces the search for new solutions. One possible alternative is to replace the traditional joining process by new technologies such as friction stir welding [4,5,6,7]. On the other hand, the constant development of new production methods such as numerically controlled machining tools allows also for the creation of so-called integral constructions, in which both the skin and stiffeners are made of one piece of material.…”