Experimental and numerical analysis of post-buckling deformation states of integrally stiffened thin-walled components of load-bearing aircraft structures

Kopecki, Tomasz; Święch, Łukasz

doi:10.15632/jtam-pl.52.4.905

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…But for this standard application the accuracy and the way of handling of the commercial GOM PONTOS device proved to be sufficient. Examples of a wide range of non-linear deformation field measurements confirm the applicability of the PONTOS system and can be found in [21].…”

Section: Strength Deformation and Stability Assessment Of The Camera Podmentioning

confidence: 72%

Measuring structure deformations of a composite glider by optical means with on-ground and in-flight testing

Bakunowicz

Święch

Meyer

2016

Meas. Sci. Technol.

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In aeronautical research experimental data sets of high quality are essential to verify and improve simulation algorithms. For this reason the experimental techniques need to be constantly refined. The shape, movement or deformation of structural aircraft elements can be measured implicitly in multiple ways; however, only optical, correlation-based techniques are able to deliver direct high-order and spatial results. In this paper two different optical metrologies are used for on-ground preparation and the actual execution of in-flight wing deformation measurements on a PW-6U glider. Firstly, the commercial PONTOS system is used for static tests on the ground and for wind tunnel investigations to successfully certify an experimental sensor pod mounted on top of the test bed fuselage. Secondly, a modification of the glider is necessary to implement the optical method named image pattern correlation technique (IPCT), which has been developed by the German Aerospace Center DLR. This scientific technology uses a stereoscopic camera set-up placed inside the experimental pod and a stochastic dot matrix applied to the area of interest on the glider wing to measure the deformation of the upper wing surface in-flight. The flight test installation, including the preparation, is described and results are presented briefly. Focussing on the compensation for typical error sources, the paper concludes with a recommended procedure to enhance the data processing for better results. Within the presented project IPCT has been developed and optimized for a new type of test bed. Adapted to the special requirements of the glider, the IPCT measurements were able to deliver a valuable wing deformation data base which now can be used to improve corresponding numerical models and simulations.

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Section: Strength Deformation and Stability Assessment Of The Camera Podmentioning

confidence: 72%

Measuring structure deformations of a composite glider by optical means with on-ground and in-flight testing

Bakunowicz

Święch

Meyer

2016

Meas. Sci. Technol.

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“…The measuring system entails taking many images of the studied item. An initial 3D digital model is created after the spatial point cloud is subjected to triangulation [12].…”

Section: Digital Image Correlation Systemmentioning

confidence: 99%

Investigating and Analyzing the Stress Distribution in Flexible Adherend for Peel-Loaded Adhesive Joints

Al-Sabur,

Khalaf,

Kubit

et al. 2024

Preprint

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In engineering applications, the significance of the adhesive joint geometry lies in its direct consequence on load distribution, stress concentration, and durability of the bonded structure. In this study, two homogenous rectangular bodies were adhesively joined along a 12.5 mm. The focus of this study is to investigate the distribution of normal stresses in an adhesive joint subjected to peel load. The upper body represents the flexible adherent, and the lower body represents the rigid adherent. Six points on the upper body and three points in the adhesive joint were selected to investigate displacement and strain. The obtained results were valuable and showed changes in displacement gradually reduced from the rigid and flexible adherents to the adhesive joint. Notably, the displacement reached zero at the adhesive joint on point 5, meaning the stiffness of the adhesive layer bonding was effective. On the other hand, the study examined the adhesive layer deformation according to the uniformity of displacements across vertically aligned points. The adhesive layer's consistent response to the applied load at various locations confirmed the uniform deformation properties inside. This study's experimental data gave important insight into the deformation of adhesive joints and how stresses are distributed in them.

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“…The idea is based on the introduction of low-profile, integral stiffening elements to improve the buckling resistance without changing the mass of the structure. The positive impacts of such a solution, in the case of prismatic sub-stiffening on buckling and limit loads of thin-walled panels, have been under consideration by means of experimental and numerical studies [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

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

Święch

2019

Materials

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Constant developments in manufacturing technology have made it possible to introduce integrally stiffened elements into load-bearing, thin-walled structures. The application of thin-walled elements with integral stiffeners potentially increases buckling and critical loads to maintain the mass of the structure and lower production costs. This paper presents the results of experimental investigations and numerical Finite Element Modelling (FEM) analyses of low-profile, isosceles grid stiffened, aluminium alloy plates subjected to pure shear load. Conducted research included analysing buckling and post-buckling states of deformation, taking into account both geometrical and physical nonlinear effects. Use of the Digital Image Correlation (DIC) system during the experimental tests created representative equilibrium pathways and recorded displacement field distributions over the plate surface. The model was initially validated against the experimental results. The results for the stiffened plate were compared to the reference structure in the form of a smooth plate with equivalent mass. Comparative analyses included examining the displacement fields and stress efforts over the plates. The stiffening configuration under examination increased the critical buckling load by 300% in comparison to the unstiffened structure with the same mass. Obtained results also indicate potential problems with areas of concentrated stress in the case of an incorrect geometry design near to the boundary conditions.

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Experimental and numerical analysis of post-buckling deformation states of integrally stiffened thin-walled components of load-bearing aircraft structures

Cited by 8 publications

References 3 publications

Measuring structure deformations of a composite glider by optical means with on-ground and in-flight testing

Measuring structure deformations of a composite glider by optical means with on-ground and in-flight testing

Investigating and Analyzing the Stress Distribution in Flexible Adherend for Peel-Loaded Adhesive Joints

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

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