scholarly journals Smart numerical tools for the modelling of ultrasonic testing on curved composite structures

2019 ◽  
Author(s):  
Alexandre Imperiale ◽  
Edouard Demaldent ◽  
Nicolas Leymarie ◽  
Sylvain Chatillon ◽  
Pierre Calmon
Keyword(s):  
Ultrasonic Testing ◽  
Composite Structures ◽  
Numerical Tools

Stress analysis of finite orthotropic composite containing an elliptical hole

2021 ◽  
pp. 002199832110507
Author(s):  
Narin S. Fatima ◽  
Robert E. Rowlands
Keyword(s):  
Composite Structures ◽  
Elliptical Hole ◽  
External Loading ◽  
Finite Geometries ◽  
Orthotropic Composites ◽  
Numerical Tools ◽  
Design Type ◽  
Measured Displacement ◽  
Type Information ◽  
Important Design

Although the mechanical integrity of a member can be highly influenced by associated stresses, determining the latter can be very challenging for finite orthotropic composites containing cutouts. This is particularly so if the external loading is not well known, a common situation in practical situations. Acknowledging the above, a finite elliptically-perforated orthotropic tensile laminate is stress analyzed by combining measured displacement data with relevant analytical and numerical tools. Knowledge of the external loading is unnecessary. Results are verified independently and the concepts are applicable to other situations. The developed technology can provide important design-type information for orthotropic composites. In particular, the ability to apply analyses for perforated composite structures which assume infinite geometry to finite geometries is demonstrated.

scholarly journals Evaluation of Impact Damage in Composite Structures Using Ultrasonic Testing

2018 ◽  
Vol 2018 (10) ◽  
pp. 82-92 ◽  
Author(s):  
Angelika Wronkowicz-Katunin ◽  
Krzysztof Dragan
Keyword(s):  
Image Processing ◽  
Image Analysis ◽  
Impact Energy ◽  
Ultrasonic Testing ◽  
Composite Structures ◽  
Impact Damage ◽  
Visual Observation ◽  
Effective Evaluation ◽  
Wide Range ◽  
Variable Impact

Abstract Barely visible impact damage is one of the problems commonly occurring in composite elements during an aircraft operation. The authors described the mechanisms of impact damage formation and propagation in composite structures. The paper presents a performed analysis of an influence of impact parameters on the resulting damage, i.e. its detectability by means of visual observation as well as its extent determined based on ultrasonic tests results. The tests were conducted on the CFRP specimens with a wide range of impact damage cases obtained with combinations of variable impact energy and shapes of impactors. Additionally, an algorithm based on image processing and image analysis methods is proposed for the purpose of the effective evaluation of the ultrasonic data obtained.

scholarly journals Impact Damage Evaluation in Composite Structures Based on Fusion of Results of Ultrasonic Testing and X-ray Computed Tomography

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1867 ◽  
Author(s):  
Andrzej Katunin ◽  
Angelika Wronkowicz-Katunin ◽  
Krzysztof Dragan
Keyword(s):  
Computed Tomography ◽  
Ultrasonic Testing ◽  
Composite Structures ◽  
Structural Damage ◽  
Impact Damage ◽  
Estimation Accuracy ◽  
Fracture Mechanisms ◽  
Internal Damage ◽  
X Ray ◽  
X Ray Computed

Barely visible impact damage (BVID) is one of the most dangerous types of structural damage in composites, since in most practical cases the application of advanced non-destructive testing (NDT) methods is required to detect and identify it. Due to its character of propagation, there are minor signs of structural damage on a surface, while the internal damage can be broad and complex both in the point of view of fracture mechanisms and resulting geometry of damage. The most common NDT method applied e.g., in aircraft inspections is ultrasonic testing (UT), which enables effective damage detection and localization in various environments. However, the results of such inspections are usually misestimated with respect to the true damage extent, and the quantitative analysis is biased by an error. In order to determine the estimation error a comparative analysis was performed on NDT results obtained for artificially damaged carbon fiber-reinforced composite structures using two UT methods and X-ray computed tomography (CT). The latter method was considered here as the reference one, since it gives the best spatial resolution and estimation accuracy of internal damage among the available NDT methods. Fusing the NDT results for a set of pre-damaged composite structures with various energy values of impact and various types of impactor tips applied for introducing damage, the evaluation of estimation accuracy of UT was possible. The performed analysis allowed for evaluation of relations between UT and X-ray CT NDT results and for proposal of a correcting factor for UT results for BVID in the analyzed composite structures.

Assessment of uncertainty in damage evaluation by ultrasonic testing of composite structures

2018 ◽  
Vol 203 ◽  
pp. 71-84 ◽  
Author(s):  
Angelika Wronkowicz ◽  
Krzysztof Dragan ◽  
Krzysztof Lis
Keyword(s):  
Ultrasonic Testing ◽  
Composite Structures ◽  
Damage Evaluation

A New Trefftz Based Finite Element for Static Analysis of Laminated Composite Structures

2019 ◽  
Author(s):  
Subhasankar Dwibedi
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Composite Structures ◽  
Laminated Composite ◽  
Bench Mark ◽  
Element Analysis ◽  
Laminated Composite Structures ◽  
Element Approach ◽  
Numerical Tools ◽  
Trefftz Finite Element

Abstract Composite materials have been widely used in industries for several years owing to their capability to perform better than homogeneous isotropic materials. Numerical tools like finite element method are efficiently used for analysis of structures made of composite materials. However, for complex shapes or geometries of structures, it becomes uneconomical (computational resource wise) to use Rayleigh-Ritz based finite element analysis. An unique Trefftz based finite element has been developed in this article to efficiently fill the gap in the above mentioned scenario. Hybrid-Tefftz finite element method’s flexibility to use arbitrary shaped elements comes handy in modelling complex geometries. The developed hybrid-Trefftz finite element approach has been used on symmetric angle-ply laminated composite plate and the obtained results have been compared with bench mark solutions. The present method proposes an approach for development of hybrid-Trefftz type finite elements, by which analysis of antisymmetric structures is also possible, an area of research which has been less explored by such approach as revealed from survey of available open literature.

scholarly journals Advanced ultrasonic testing of complex shaped composite structures

2016 ◽  
Vol 135 ◽  
pp. 012010 ◽  
Author(s):  
D Dolmatov ◽  
V Zhvyrblya ◽  
G Filippov ◽  
Y Salchak ◽  
E Sedanova
Keyword(s):  
Ultrasonic Testing ◽  
Composite Structures

scholarly journals Solid Truss to Shell Numerical Homogenization of Prefabricated Composite Slabs

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4120
Author(s):  
Natalia Staszak ◽  
Tomasz Garbowski ◽  
Anna Szymczak-Graczyk
Keyword(s):  
Composite Structures ◽  
Homogenization Method ◽  
Fe Model ◽  
Structural Elements ◽  
Numerical Homogenization ◽  
Single Plate ◽  
Energy Equivalence ◽  
Numerical Tools ◽  
Simplified Procedures ◽  
Excellent Tool

The need for quick and easy deflection calculations of various prefabricated slabs causes simplified procedures and numerical tools to be used more often. Modelling of full 3D finite element (FE) geometry of such plates is not only uneconomical but often requires the use of complex software and advanced numerical knowledge. Therefore, numerical homogenization is an excellent tool, which can be easily employed to simplify a model, especially when accurate modelling is not necessary. Homogenization allows for simplifying a computational model and replacing a complicated composite structure with a homogeneous plate. Here, a numerical homogenization method based on strain energy equivalence is derived. Based on the method proposed, the structure of the prefabricated concrete slabs reinforced with steel spatial trusses is homogenized to a single plate element with an effective stiffness. There is a complete equivalence between the full 3D FE model built with solid elements combined with truss structural elements and the simplified homogenized plate FE model. The method allows for the correct homogenization of any complex composite structures made of both solid and structural elements, without the need to perform advanced numerical analyses. The only requirement is a correctly formulated stiffness matrix of a representative volume element (RVE) and appropriate formulation of the transformation between kinematic constrains on the RVE boundary and generalized strains.

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