scholarly journals Experimental and Numerical Analysis of a Composite Thin-Walled Cylindrical Structures with Different Variants of Stiffeners, Subjected to Torsion

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3230 ◽  
Author(s):  
Tomasz Kopecki ◽  
Przemysław Mazurek ◽  
Tomasz Lis
Keyword(s):  
Numerical Analysis ◽  
Numerical Analyses ◽  
Modified Model ◽  
Cylindrical Structures ◽  
Local Loss ◽  
Thin Walled Structures ◽  
Non Linear ◽  
Thin Walled ◽  
Distribution Of Stress ◽  
The Impact

The aim of the study was to determine the impact of the use of isogrid stiffeners on the stress and displacement distribution of a thin-walled cylindrical shell made of layered composites subjected to torsion. It also strives to define criteria for assessing the results of non-linear numerical analysis of models of the examined structures by comparing them with the results of the model experiment. The study contains the results of experimental research using models made of glass–epoxy composites and the results of numerical analyses in non-linear terms. The experiment was carried out using a special test stand. The research involved two types of considered structures. The results of the research allowed to create the concept of an adequate numerical model in terms of the finite element method, allowing to determine the distribution of stress and strain in the components of the studied structures. Simultaneously, the obtained conformity between the results of non-linear numerical analyses and the experiment allows to consider the results of analyses of the modified model in order to determine the properties of different stiffening variants as reliable. The presented research allows to determine the nature of the deformation of composite thin-walled structures in which local loss of stability of the covering is acceptable in the area of post-critical loads.

Perforation analysis of selected thin-walled structures

2021 ◽  
Vol 70 (1) ◽  
pp. 63-77
Author(s):  
Arkadiusz Popławski ◽  
Weronika Piskorz
Keyword(s):  
Material Selection ◽  
Three Dimensional ◽  
Material Model ◽  
Numerical Analyses ◽  
Thin Walled Structures ◽  
Constitutive Material Model ◽  
Thin Walled ◽  
Optimal Material ◽  
Selection Stage ◽  
The Impact

The paper concerns multivariate numerical analyses of three thin-walled three-dimensional structures of honeycomb, rectangular and auxetic topologies. The analyses were preceded by the selection of the material from which the structures could potentially be made. The most optimal material was selected from three metallic materials for which an advanced constitutive material model and a failure model were available. The use of an appropriate model has allowed a number of phenomena to be taken into account during the very complex perforation process, which translates into the quality and accuracy of the numerical results obtained. The main numerical analyses carried out after the material selection stage, focused on the analysis of the strength of the structures in the process of their perforation with objects in the form of a ball with a diameter of 10 mm. The three objects hitting the structures were arranged in such a way as to take into account the influence of the impact location on the perforation process. Based on the measurement of the perforation depth of the balls and the analysis of the area of impact on the structure, the most strength topology was selected. In the next step, additional numerical analyses were carried out to determine the effectiveness of the structure and to estimate its ballistic limit.

Energy absorbed ability and damage analysis for honeycomb sandwich material of bio-inspired micro aerial vehicle under low velocity impact

2020 ◽  
pp. 095440622097542
Author(s):  
Jianxun Du ◽  
Peng Hao ◽  
Mabao Liu ◽  
Rui Xue ◽  
Lin’an Li
Keyword(s):  
Honeycomb Structure ◽  
Low Velocity Impact ◽  
Parameter Study ◽  
Low Velocity ◽  
Micro Aerial Vehicle ◽  
Thin Walled Structures ◽  
Wide Range ◽  
Aerial Vehicle ◽  
Thin Walled ◽  
The Impact

Because of the advantages of light weight, small size, and good maneuverability, the bio-inspired micro aerial vehicle has a wide range of application prospects and development potential in military and civil areas, and has become one of the research hotspots in the future aviation field. The beetle’s elytra possess high strength and provide the protection of the abdomen while being functional to guarantee its flight performance. In this study, the internal microstructure of beetle’s elytra was observed by scanning electron microscope (SEM), and a variety of bionic thin-walled structures were proposed and modelled. The energy absorption characteristics and protective performance of different configurations of thin-walled structures with hollow columns under impact loading was analyzed by finite element method. The parameter study was carried out to show the influence of the velocity of impactor, the impact angle of the impactor and the wall thickness of honeycomb structure. This study provides an important inspiration for the design of the protective structure of the micro aerial vehicle.

Some comments on the numerical analysis of plates and thin-walled structures

2008 ◽  
Vol 46 (7-9) ◽  
pp. 975-980 ◽  
Author(s):  
Federico Guarracino ◽  
Alastair Walker
Keyword(s):  
Numerical Analysis ◽  
Thin Walled Structures ◽  
Thin Walled

Non-linear thermoelastic analysis of thin-walled structures with cohesive-like interfaces relying on the solid shell concept

2022 ◽  
Vol 202 ◽  
pp. 103696
Author(s):  
Pavan Kumar Asur Vijaya Kumar ◽  
Aamir Dean ◽  
Shahab Sahraee ◽  
Jose Reinoso ◽  
Marco Paggi
Keyword(s):  
Solid Shell ◽  
Thermoelastic Analysis ◽  
Thin Walled Structures ◽  
Non Linear ◽  
Thin Walled

Dynamic Analysis of Fracture in Thin-Walled Pipes

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
C. Gato ◽  
Y. Shie
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Fracture ◽  
Meshfree Method ◽  
Meshfree Methods ◽  
Shape Functions ◽  
Order Continuity ◽  
Cylindrical Structures ◽  
Thin Walled Structures ◽  
Ill Conditioning ◽  
Thin Walled

Dynamic fracture of thin-walled cylindrical structures is studied with a large deformation meshfree method. Due to the higher order continuity and smoothness of the shape functions, meshfree methods are well suited to simulate dynamic fracture of thin-walled structures since they avoid ill-conditioning as well as stiffening in numerical computations. Simulations of detonation driven fracture in thin pipes demonstrate the efficiency of the method.

scholarly journals The Impact of 3D Printing Parameters on the Post-Buckling Behavior of Thin-Walled Structures

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4742
Author(s):  
Tomasz Kopecki ◽  
Przemysław Mazurek ◽  
Łukasz Święch
Keyword(s):  
3D Printing ◽  
Numerical Solutions ◽  
Structure Mapping ◽  
Thin Walled Structures ◽  
Buckling Behavior ◽  
Post Buckling ◽  
Thin Walled ◽  
The Impact ◽  
Printing Direction ◽  
Bearing Structure

This study presents the results of experimental research and numerical calculations regarding models of a typical torsion box fragment, which is a common thin-walled load-bearing structure used in aviation technology. A fragment of this structure corresponding to the spar wall was made using 3D printing. The examined system was subjected to twisting and underwent post-critical deformation. The research was aimed at determining the influence of the printing direction of the structure’s individual layers on the system stiffness. The experimental phase was supplemented by nonlinear numerical analyses of the models of the studied systems, taking into account the details of the structure mapping using the laminate concept. The purpose of the calculations was to determine the usefulness of the adopted method for modeling the examined structures by assessing the compliance of numerical solutions with the results of the experiment.

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