FLAME ACCELLERATION AND ONSET OF DETONATION IN CYLINDRICAL TUBES

2019 ◽  
Author(s):  
Y.A. BARANYSHYN ◽  
◽  
P.N. KRIVOSHEYEV ◽  
O.G. PENYAZKOV ◽  
K.L. SEVROUK ◽  
...  
Keyword(s):  
Cylindrical Tubes

Bifurcation analysis of elastic residually-stressed circular cylindrical tubes

2021 ◽  
pp. 111062
Author(s):  
Andrey Melnikov ◽  
Ray W. Ogden ◽  
Luis Dorfmann ◽  
Jose Merodio
Keyword(s):  
Bifurcation Analysis ◽  
Cylindrical Tubes

Analytical solutions for yield onset achievement in FGM thick walled cylindrical tubes undergoing thermomechanical loads

2017 ◽  
Vol 116 ◽  
pp. 211-223 ◽  
Author(s):  
S. Ansari Sadrabadi ◽  
G.H. Rahimi ◽  
R. Citarella ◽  
J. Shahbazi Karami ◽  
R. Sepe ◽  
...  
Keyword(s):  
Analytical Solutions ◽  
Cylindrical Tubes

scholarly journals Modelling the Inflation and Elastic Instabilities of Rubber-Like Spherical and Cylindrical Shells Using a New Generalised Neo-Hookean Strain Energy Function

2021 ◽  
Author(s):  
Afshin Anssari-Benam ◽  
Andrea Bucchi ◽  
Giuseppe Saccomandi
Keyword(s):  
Experimental Data ◽  
Energy Function ◽  
Limit Point ◽  
Strain Energy ◽  
Cylindrical Shells ◽  
Strain Energy Function ◽  
Model Parameters ◽  
Wide Range ◽  
Cylindrical Tubes ◽  
Gent Model

AbstractThe application of a newly proposed generalised neo-Hookean strain energy function to the inflation of incompressible rubber-like spherical and cylindrical shells is demonstrated in this paper. The pressure ($P$ P ) – inflation ($\lambda $ λ or $v$ v ) relationships are derived and presented for four shells: thin- and thick-walled spherical balloons, and thin- and thick-walled cylindrical tubes. Characteristics of the inflation curves predicted by the model for the four considered shells are analysed and the critical values of the model parameters for exhibiting the limit-point instability are established. The application of the model to extant experimental datasets procured from studies across 19th to 21st century will be demonstrated, showing favourable agreement between the model and the experimental data. The capability of the model to capture the two characteristic instability phenomena in the inflation of rubber-like materials, namely the limit-point and inflation-jump instabilities, will be made evident from both the theoretical analysis and curve-fitting approaches presented in this study. A comparison with the predictions of the Gent model for the considered data is also demonstrated and is shown that our presented model provides improved fits. Given the simplicity of the model, its ability to fit a wide range of experimental data and capture both limit-point and inflation-jump instabilities, we propose the application of our model to the inflation of rubber-like materials.

The Stress Concentration Factors in Cylindrical Tubes with Transverse Circular Holes

1959 ◽  
Vol 10 (4) ◽  
pp. 326-344 ◽  
Author(s):  
H. T. Jessop ◽  
C. Snell ◽  
I. M. Allison
Keyword(s):  
Stress Concentration ◽  
Maximum Stress ◽  
Stress System ◽  
Complete Knowledge ◽  
Geometrical Shapes ◽  
Cylindrical Tubes ◽  
Circular Holes ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Better Than

The “frozen stress” techniques of photoelasticity can give a complete knowledge of the stress, system in a solid body, but the examination of the stresses requires more time and care than in corresponding flat plate tests. In tests on tubes with transverse circular holes, sponsored by The Royal Aeronautical Society, all practicable geometrical shapes are examined and the maximum stress is measured in tension, bending and torsion. The results are comprehensive and show the inadequacy of previous results. In all cases the maximum stress occurs inside the bore of the hole. The accuracy of all the graphs of stress concentration factors is better than five per cent.

Crashworthiness Optimization of Thin Walled Cylindrical Tubes with Annular Grooves under Axial Compression

2012 ◽  
Vol 463-464 ◽  
pp. 30-35 ◽  
Author(s):  
Reza Emami ◽  
Elahe Sadat Alavi Moghadam ◽  
Mostafa Sohrabi
Keyword(s):  
Maximum Load ◽  
Absorbed Energy ◽  
Optimal Point ◽  
Composite Function ◽  
Explicit Finite Element ◽  
Cylindrical Tubes ◽  
Allowable Load ◽  
Design Requirements ◽  
Energy Absorbers ◽  
Crushing Behavior

In this paper explicit finite element codes of LS DYNA are applied to simulate the crushing behavior of cylindrical metallic impact energy absorbers with annular machined grooves and the validation of the simulation results are done by comparing with experimental and theoretical findings from the literature. Some efforts are made to find the optimum groove geometry of the tubes by considering two criteria such as the maximum absorbed energy per unit mass (SEA) and maximum ratio of average load to maximum load during crushing (CFE). Maximum allowable load during crushing and the geometrical limits that should not exceed some specified boundaries are considered as design constrains. Based on design of experiment technique (DOE) the conditions that the results should be taken are determined and consequently, response surface (RS) models are created to build a composite objective function that considers both CFE and SEA. Genetic algorithm is applied to find the optimal point for the composite function that meets the design requirements.

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